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The purpose of this study was to investigate the effect of active or passive recovery after two different rest intervals on performance during repeated bouts of maximal swimming exercise. Sixteen swimmers (eight males and eight females) performed four trials in a counterbalanced order. Eight repetitions of 25-m sprints (8 x 25 m), with a rest interval of 45 or 120 s, followed by a 50-m sprint test 6 min later, were performed in each trial. The 45 or 120-s interval was either active (A45 and A120) or passive (P45 and P120). The intensity of the active recovery corresponded to 60% of the individual best 100-m velocity. Performance time was recorded using an official competition timing system. The first 25-m sprint was comparable across trials (P>0.05), but performance was decreased after the second sprint during active compared to passive recovery, irrespective of the interval duration (P<0.05). The 50-m sprint time was 2.4% better in the P120 and A120 compared to the A45 and P45 trials (P<0.05). After completing the 8x25 m, blood lactate was decreased with active recovery when the interval period was 120 s (P120 vs A120, P<0.05). Blood lactate concentration at the start as well as 5 min after the 50-m sprint was lower in the A120 and A45 compared to the P120 and P45 trials respectively (P<0.05). Plasma glycerol was not different between trials (P>0.05), whereas plasma ammonia was higher in the A45 compared to the P120 trial (P<0.05). The interval period separating short-duration sprints may therefore alter performance when subsequent maximum exertion is applied. For sustained sprinting ability, passive recovery is advised during repeated swimming sprints of short duration.
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Argyris G. Toubekis Æ Helen T. Douda
Savvas P. Tokmakidis
Influence of different rest intervals during active or passive
recovery on repeated sprint swimming performance
Accepted: 19 September 2004 / Published online: 20 November 2004
Springer-Verlag 2004
Abstract The purpose of this study was to investigate the
effect of active or passive recovery after two different rest
intervals on performance during repeated bouts of
maximal swimming exercise. Sixteen swimmers (eight
males and eight females) performed four trials in a
counterbalanced order. Eight repetitions of 25-m sprints
(8·25 m), with a rest interval of 45 or 120 s, followed by
a 50-m sprint test 6 min later, were performed in each
trial. The 45 or 120-s interval was either active (A45 and
A120) or passive (P45 and P120). The intensity of the
active recovery corresponded to 60% of the individual
best 100-m velocity. Performance time was recorded
using an official competition timing system. The first 25-
m sprint was comparable across trials (P>0.05), but
performance was decreased after the second sprint dur-
ing active compared to passive recovery, irrespective of
the interval duration (P<0.05). The 50-m sprint time
was 2.4% better in the P120 and A120 compared to the
A45 and P45 trials (P<0.05). After completing the
8·25 m, blood lactate was decreased with active recov-
ery when the interval period was 120 s (P120 vs A120,
P<0.05). Blood lactate concentration at the start as well
as 5 min after the 50-m sprint was lower in the A120 and
A45 compared to the P120 and P45 trials respectively
(P<0.05). Plasma glycerol was not different between
trials (P>0.05), whereas plasma ammonia was higher in
the A45 compared to the P120 trial (P<0.05). The in-
terval period separating short-duration sprints may
therefore alter performance when subsequent maximum
exertion is applied. For sustained sprinting ability, pas-
sive recovery is advised during repeated swimming
sprints of short duration.
Keywords Active recovery Æ Sprint swimming Æ
Interval duration Æ Performance
It has been suggested that when active recovery is ap-
plied between repeated bouts, it may facilitate perfor-
mance more than when applying passive rest (Maglischo
2003). When active recovery is applied during the rest
interval between short-duration sprints in cycling (i.e. 6–
30 s), performance is better maintained compared to
passive recovery (Signorile et al. 1993; Ahma idi et al.
1996; Bogdanis et al. 1996b). This may be attributed to
increased muscle blood flow (Bangsbo et al. 1994), which
in turn may facilitate oxygen supply to the cell for a
faster phosphocreatine (PCr) resynthesis.
During successive bouts of sprint exercise, a short-
duration interval period leads to incomplete resynthesis
of PCr (Gaitanos et al. 1993; Bogdanis et al. 1996a,
1998). At the same time, anaero bic glycolysis results in
high levels of muscle lactate associated with hydrogen
ions. Lactate can no longer be considered the cause of
fatigue (Gladden 2004). However, intramuscular meta-
bolic byproducts, such as inorganic phosphate as well as
hydrogen ions, may act to impair muscle function
(Hermansen 1981). Even though aerobic ATP contri-
bution increases to compensate for the reduced rate of
ATP provided by anaerobic sources (Bogdanis et al.
1996a), it does not prevent the significant reduction in
power output and velocity which occurs during repeated
short-duration cycling, swimming or running (Balsom
et al. 1992a; Gaitanos et al. 1993; Peyrebr une et al.1998).
Studies conducted with swimmers examined the
application of active recovery after long-duration (about
2 min) swimming exercise and after long resting periods
(i.e. 14 min, Felix et al. 1997; or 3 min, McMurray
1969). However, it is possible that changes in duration
and intensity of the exercise as well as duration of the
resting interval alter energy contribution. It has been
A. G. Toubekis Æ H. T. Douda Æ S. P. Tokmakidis (&)
Department of Physical Education
and Sport Science, Democritus University
of Thrace, 69100 Komotini , Greece
Tel.: +30-531-39649
Fax: +30-531-39683
Eur J Appl Physiol (2005) 93: 694–700
DOI 10.1007/s00421-004-1244-9
shown that performance af ter active recovery may be
better maintained when the intensity is maximum and
the duration is short (Weltman et al. 1977; Signorile
et al. 1993; Bogdanis et al. 1996b), but not when longer
duration exercise is performed (e.g. 5 min, Weltman
et al. 1979). Despite this fact, the findings on swimming
are inconclusive since only one study found increased
performance on a 200-yard (182.88-m) trial after active
compared to passive recovery (Felix et al. 1997). Data
from our laboratory found negative effects on swimming
velocity after active recovery (Toubekis and Tokmakidis
2003). Thus, there is lim ited information regarding the
effects of active recovery on performance during short
distances (25–50 m), which are frequently used during
sprint training in swimming (Maglischo 2003). The
purpose of this study was to examine the effects of active
recovery on performance during repeated 25-m sprints
and a subsequent 50-m sprint test. Two different rest
periods of 45 and 120 s were selected to examine any
possible influence of active recovery duration on per-
formance. It was hypothesized that active recovery
would lead to better maintenance of sprint swimming
Sixteen swimmers [eight males, age 21.2 (0.6) years,
height 177.8 (2.1) cm, body mass 73.8 (1.5) kg; and eight
females, age 21.4 (0.6) years, height 169.6 (2.2) cm, body
mass 66.4 (3.0) kg] with past competitive experience
agreed to participate in this study, which was conducted
with the approval of the University’s Ethical Committee.
All swimmers were informed in detail about the experi-
mental procedure and signed an informed consent
statement. Participants refrained from competitive
swimming and formal training for at least 2 years before
the examination period, but they performed recreational
swimming two or three times per week.
Each swimmer participated in two familiarization ses-
sions. Maximum exercise of 25-m bouts with 45 or 120 s
rest interval was performed. The time of self-sel ected
active reco very for at least 200 m after the completion of
four to six sprints was recorded. This self-selected pace
corresponded to 68 (2)% of the 100-m maximum
velocity, and swimmers were instructed to adopt the
pace suggested by Cazorla et al. (1983) corresponding to
60% of the 100-m velocity in a following session. A test–
retest was performed with 4·25 sprints separated with
45-s intervals. No significant difference was observed
between trials in the first sprint or in the mean perfor-
mance of the four sprints (P>0.05). Preliminary trials
started within a week of the familiarization sessions.
Female swimmers were not tested during menstruation
in any of the familiarization, preliminary or main trials
Preliminary trials
All swimmers initially performed a 100-m trial, applying
the rules of an official competition, in order to determine
the best performance time on this distance. A 50-ll
blood sample was taken from a finger 5 min after the
trial. On a second day, each swimmer completed two
repetitions of 200 m, swimming at a pace corresponding
to 60% of the 100-m velocity. A blood sample was taken
at rest and immediately after each 200-m repe tition.
Blood lactate concentration was not changed after the
second [2.26 (0.27) mmol l
] compared to the first
200 m [2.49 (0.22) mmol l
, P>0.05]. This confirmed
that the adopted velocity for active recovery did not
cause increased accumulation of blood lactate.
Main trials
All swimmers completed four main trials under different
conditions. Eight repetitions of 25-m sprints (8·25 m),
with an interval period of 45 or 120 s followed by a 50-m
sprint test 6 min later, were performed in each trial. The
45 or 120-s interval was either active (A45 and A120) or
passive (P45 and P120). When passive recovery was
applied, swimmers rested standing still in the water,
while in active recovery, they swam at a pace corre-
sponding to 60% of the best 100-m individual velocity.
A period of about 6–8 s preceding and following each
sprint was allowed before the swimmers could get ready
and take the starting position for active recovery in the
A45 and A120 trials. As a consequence, about 30 s and
100 s were available for active recovery in the A45 and
A120 trials respectively. When the interval period in the
A45 trial was not enough to cover the 25-m distance of
the swimming pool with the required velocity for active
recovery, the swimmers were asked to swim at a prede-
termined point and return to the finishing side of the
pool. During the 6-min interval period separating the
8·25-m and the 50-m sprint, a time of 150 s was allowed
for blood sampling while the swimmers rested passively
next to the swimming pool. As a consequence, the time
available for active recovery after the 8·25 m in the
A120 and A45 trials was about 210 s.
All trials were performed at the same time of the day
after a controlled warm-up (600 m swim, 200 kicks, 200
pulls, 4·10-m spri nts) in counterbalanced order. The
front crawl swimming style was used in all trials starting
with a push-off from within the water in a 25-m indoor
swimming pool. The water temperature was kept at 25–
The time required to complete each 25 or 50-m bout
was recorded with an accuracy of 1/1,000 s by an official
timing system used during swimming competition
(TancCo timing system). Briefly, two touchpads were
affixed to the walls at both ends of the swimming pool
and both were connected to the recording system where
swimming time was printed after touching any side of
the pool. All swimmers were familiarized with the
starting and finishing procedure, and easily adopted
the pace of active recovery. At the same time, one of the
investigators was walking alongside the pool deck giving
instructions about pacing when necessary during active
Diet and exercise restrictions
Participants were asked to follow similar activities, and
apply the same diet with controlled carbohydrate con-
tent 2 days before each trial. They were also advised to
avoid heavy exercise, alcohol or caffeine consumption
for 24 h preceding each trial.
Blood sampling and analysis
On arrival at the pool for each main trial, swimmers
rested for 20 min and then a venous blood sample (5 ml)
was collected from an antecubital vein. One more ve-
nous sample (5 ml) was collected during the second
minute of recovery after the last 25-m sprint. Capillary
blood samples (50 ll) were also taken from a fingertip as
follows: at rest, after warm-up, at the second minute of
recovery after the 8·25 m, as well as before and 5 min
after the 50-m sprint. A time of about 100 s was used to
get the swimmer dried after the 8·25 m, and an addi-
tional 50 s to get the finger blood sample when active
recovery was applied.
The venous sample was placed into tubes containing
lithium heparin, centrifuged immediately at 4,000 rpm
(2,361 g) for 10 min, and the supernatant was then
placed into an ice bath. Ammonia was determined
within 3 h after sampling, using the procedures
described by Sigma (kit no. 171-UV, coefficient of var-
iation 4.2%). The remaining plasma was stored at
80C and later analyzed for glycerol concentration
(Sigma kit no. 337, coefficient of variation 2.2%).
Capillary samples were deproteinized in tubes con-
taining 100 ll trichloroac etic acid. The tubes were
centrifuged at 3,200 rpm (1,522 g) for 10 min, stored
at 80C, and later analyzed enzymically for lactate
concentration using a spectrophotometer (Hitachi
U-2001) and the procedure described by Sigma (kit
no. 826-UV).
Triplicate samples of 75 ll were collected at rest
and after the 8·25 m into heparinized capillary tubes.
After centrifuging for 15 min at 13,000 rpm (15,682 g),
the haematocrit was determined. Haemoglobin was
measured using the Cyanmethemoglobin Method
(Sigma, kit no. 525). Changes in plasma volume were
estimated from the changes in haemoglobin and
haematocrit values as described by Dill and Costill
Statistical analysis
A three-way analysis of variance for repeated measures
was used to examine differences between means
(sex · trials · sprints). Since no significant interaction
for sex was observed in most variables, a two-way
analysis of variance was performed on the whole sample
(trials · sprints, independent of sex). The Tukey post-
hoc test was used to locate the observed differences. The
Pearson correlation coefficient was used to examine
correlation between variables. The accepted level of
significance was set at P<0.05. The results are presented
as means (SE).
Preliminary tests
The mean time for the 100 m was 63.12 (2.40) s for
males and 75.90 (1.80) s for females; blood lactate values
5 min after this trial were 13.0 (0.6) mmol l
and 10.5
(0.6) mmol l
respectively (time and lactate, males vs
females, P<0.05).
Main trials
Swimming velocity decreased more during active com-
pared to passive recovery between sprints (main effect
trials and interaction, P<0.05, Fig. 1). This was ob-
served irrespectively of the time interval between sprints.
The average times for 8·25 m were 15.12 (0.39), 15.72
(0.44) 15.93 (0.43) and 16.49 (0.49) s for the P120, A120,
P45 and A45 trials respec tively (P120 vs A45, P<0.05).
The time to complete the first 25-m sprint was not sta-
tistically different between trials [P120, 14.93 (0.39) s;
A120, 15.00 (0.38) s; P45, 15.25 (0.39) s; A45 15.17
Fig. 1 Time to complete each 25-m sprint in each trial.
between the corresponding sprint in trials at the same interval,
P<0.05 compared to first sprint in the A120 and A45 trials,
P<0.05 compared to first sprint in the P120 and P45 trials, [n=16,
mean (SE)]
(0.42) s; P>0.05; Fig. 1]. However, during the A120 and
A45 trials, velocity decreased by 5% and 6% respec-
tively in the second sprint compared to the first, whereas
no difference was observed in the corresponding sprint
for the P120 and P45 trials (Fig. 1). Swimming velocity,
compared to the first sprint was well maintained, up to
the sixth sprint in the P120 and up to the second sprint in
the P45 trials (Fig. 1).
The ti me to complete the 50-m sprint, performed
6 min after the 8·25 m, was not affected by the type of
recovery, but was faster during the longer interval [P120,
33.59 (1 .05) s; A120, 33.58 (1.02) s] compared to the
shorter interval trials [P45, 34.33 (1.06) s; A45, 34.48
(1.17) s; P<0.05].
Blood metabolites
Blood lactate concentration increased in all four trials
after the 8·25 m compared to resting and post-warm-up
values, and was higher in the P120 compared to the
A120 trial (main effect trials and interaction, P<0.05).
The corresponding lactate values in the P45 and A45
trials were not statistically different ( P>0.05). Six min-
utes later, at the start of the 50-m sprint, blood lactate
concentration decreased, co mpared to the post 8·25 m
value, only when recovery was active (P<0.05, Fig. 2).
After the 50-m sprint, lactate concentration was in-
creased in all four trials compared to the pre-start val-
ues. However, it was lowe r during both the active
recovery trials compared to the corresponding passive
recovery (P<0.05, Fig. 2). No difference was observed
between passive P120 and P45 or active A120 and A45
trials at any point. The blood lactate concentration at
the end of the 6-min recovery period was not correlated
with performance on the 50-m sprint (r=0.22–0.37,
P>0.05). The blood lactate measured 5 min after the
50-m sprint was correlated to performance time in the
P120 and A120 (r=0.54 and 0.56 respectively,
P<0.05), but not in the P45 and A45 trials (r= 0.41
and 0.51 respectively, P>0.05).
Plasma ammonia was lower in women compared to
men (main effect sex, P<0.05). However, no interaction
was observed between sexes (P>0.05). When the results
were analysed for the whole group, ammonia increased
compared to resting values in all trials, but no difference
was observed between trials with the same interval
duration. Ammonia concentration was higher in the A45
compared to P120 trial (Table 1). Plasma ammonia was
strongly correlated to blood lactate concentration after
the 8·25 m (r=0.71–0.86, P<0.01).
Plasma glycerol increased compared to resting values,
but no differences were observed between trials
(Table 1). No alterations in the results were observed in
trials for ammonia or glycerol concentration when the
values were corrected for plasma volume changes.
Haematocrit and haemoglobin increased after the last
25-m sprint; however, no differences were observed
between trials (P>0.05, Table 1). Plasma volume
changes were not statistically different between trials
(P>0.05, Table 1).
The present study examined the effects of tw o different
types of recovery on repeated sprint swimming perfor-
mance. Active or passive recovery at 45 and 120-s
intervals was applied during the period separating 25-m
sprints, and the findings clearly indicate that active
recovery increases fatigue following both recovery
intervals. It is evident that when swimmers rested pas-
sively between sprints, velocity was better maintained
irrespective of the interval duration. Furthermore,
velocity during the subsequent 50-m sprint was not
affected by the type of recovery (active or passive), but
was impaired to a greater extent when the interval
during the 8·25 m sprints was shorter (45 s vs 120 s).
Performance during the 25-m sprints
The duration of the exercise as well as the rest inte rval
separating successive sprints are crucial factors for per-
formance maintenance (Holmyard et al. 1987; Balsom
et al. 1992a, b). The duration of each 25-m sprint in the
present study ranged from 13 to 17 s. During a sprint
that lasts 10–20 s, muscle lactate and hydrogen ion (H
concentrations reach high levels (Bogdanis et al. 1998).
The increased concentration of H
may be respon sible
for the decreased performance during subsequent
sprints, since it may impair the function of glycolytic
enzymes (Spriet et al. 1989 ). Additionally, the increased
accumulation of inorganic phosphate (P
) may depress
the muscular function by several mechanisms (Wester-
blad and Allen 2003). This may explain the decrement in
swimming velocity observed in our second sprint during
the active recovery trials. However, the fact that a drop
Fig. 2 Blood lactate concentration during each trial.
between A120 versus P120,
P<0.05 between P45 versus A45,
P<0.05 with the previous sampling point in the A45 and A120
P<0.05 from the previous sampling point in all trials
[n=16, mean (SE)]
in velocity from sprint 1 to sprint 2 was not seen when
passive recovery was applied shows that muscle acidosis
and increased accumulation of P
are not the only factors
affecting performance during the A120 and A45 trials.
During repeated short-duration sprints, the rate of
PCr resynthesis is crucial for performance maintenance,
(Gaitanos et al. 1993), although the availability of this
substrate rapidly decreases within 10–20 s of dynamic
exercise (Bogdanis et al. 1996a, 1998). Several metabolic
alterations within the muscle cell, such as pH and oxy-
gen availability, may affect the resynthesis of PCr
(Sahlin et al. 1979; Haseler et al. 1999). Any changes in
these factors caused by the type of recovery after
sprint 1 may be reflected in the performance of sprint 2.
The intensity of active recovery in the present study
corresponded to 60% of the maximum 100-m velocity.
This intensity was selected because it facilitates blood
lactate removal during swimm ing (Cazorla et al. 1983)
and prevents lactate accumulation, as shown in a pre-
liminary trial in the present study (see Methods).
Unpublished observations from our laboratory have
shown that this velocity corresponds to an intensity of
about 40–45% of the maximum oxygen uptake
). When swimming slowly, swimmers rely
mainly on arm work, while the limited leg action is used
to keep body balance. Additionally, slow arm move-
ments increase the time between breaths, since swimmers
normally breathe at every stroke cycle. This allows
swimmers to breathe every 2–3 s, while inspiration time
must be short to keep up with stroke coordination.
Under these conditions, the volume of inspired oxygen
may be reduced, causing a reduction in arterial oxygen
pressure and arterial hypoxaemia (Yamamoto et al.
1987). The fact that the participants in the present study
were untrained may have further challenged the
breathing pattern.
Even further, Dupont et al. (2004) used near-infrared
spectroscopy in cycling, and demonstrated a slower
reoxygenation of oxyhaemoglobin during active recov-
ery, corresponding to an intensity of 40% of maximum
oxygen uptake. Oxyhaemoglobin saturation may reflect
the balance of oxygen supply and utilization. It is also
possible that the energy demand increases during active
recovery even at a slow swimming pace. Increased oxy-
gen uptake during active recovery has been reported for
cycling (Bogdanis et al. 1996b), and for high-intensity
intermittent running (Dupont et al. 2003). It is likely
then that there is an imbalance between the oxygen
required and the oxygen available. In this case the
reduced oxygen availabili ty may increase the time
constant for PCr resynthesis (Haseler et al. 1999), and
decrease performance during repeated short-duration
sprints (Balso m et al. 1994). Applying a different
swimming velocity during the active recovery interval
period could have led to a different metabolic demand
and could possibly have affected performance.
Decreased performance on the following sprints
(3–8) in the P45 trial may be attributed to combined
effects of reduced PCr resynthesis rate and decreased
rate of anaerobic glycolysi s caused by H
tion (Hermansen 1981; Spriet et al. 1989; Hargreaves
et al. 1998). It is likely that the increased interval
period of the P120 trial enabled adequate PCr resyn-
thesis and availability during subsequent sprinting. A
decreased rate of PCr resynthesis (with potential
mechanisms described earlier) may have further
reduced sprinting ability during the active recovery
periods of the A120 and A45 trials.
Improved performance after active recovery was
reported during sprint cycling (Signorile et al. 1993;
Bogdanis et al. 1996b; Ahmaidi et al. 1996). Female
swimmers swam faster on a 200-yard (182.88-m) trial
after a long duration active recovery study (Felix et al.
1997). In contrast, the time to exhaustion was decreased
when short-duration running or cycling bou ts at an
intensity of 120%
were separated with active
recovery (Dupont et al. 2003, 2004). In addition, data
from our laborat ory confirmed a decrease in perfor-
mance after active recovery (Toubekis and Tokmakidis
2003). The exercise intensity and duration of various
experimental protocols may explain the different results
found in the present study and previous studies in
cycling or swimming (Signorile et al. 1993; Bogdanis
et al. 1996b; Ahma idi et al. 1996; Felix et al. 1997;
Toubekis and Tokmakidis 2003).
Plasma ammon ia levels were not different during
trials of the same interval duration, despite a tendency
for increased values after active recovery. Higher
ammonia values after active recovery have been reported
by Bogdanis et al. (1996b). Indeed, the increased plasma
ammonia after active recovery in the present study may
be attributed to increased efflux from the muscle because
Table 1 Haematocrit, haemoglobin, plasma volume changes (PVC), plasma ammonia and glycerol, at rest and after 8·25-m sprints in the
four trials. Values are means (SE) for 16 subjects. Ammonia values, n=13
Trial Haematocrit
(g dl
Plasma ammonia
(lmol l
Plasma glycerol
(mmol l
Rest Post 8·25 m Rest Post 8·25 m Rest Post 8·25 m Rest Post 8·25 m
P120 45.0 (0.8) 48.5 (0.9) 14.0 (0.5) 14.7 (0.5) 11.1 (0.9) 24.4 (2.9) 81.9 (7.5) 0.068 (0.013) 0.157 (0.028)
A120 45.0 (1.0) 48.3 (1.1) 13.7 (0.5) 14.6 (0.5) 12.1 (1.2) 20.8 (2.0) 98.5 (11.9) 0.074 (0.011) 0.133 (0.016)
P45 45.1 (0.8) 49.0 (0.9) 13.9 (0.5) 15.0 (0.5) 13.9 (1.0) 21.9 (2.4) 103.7 (15.8) 0.080 (0.013) 0.148 (0.023)
A45 45.5 (0.7) 49.1 (0.8) 13.9 (0.5) 14.8 (0.5) 11.7 (1.1) 23.8 (2.4) 115.7 (17.9)* 0.067 (0.010) 0.121 (0.015)
*P<0.05 compared to P120 trial; all post values compared to rest P<0.05
of increased muscle blood flow. In addition, a decreased
ammonia concentration would support an assumption
for less energy deficit in the passive recovery trials rather
than in the active.
Performance of the 50-m sprint
Improvement of performance was observed for the
50-m sprint after the long- (P120, A120) compared to
short-interval (P45, A45) trials. To our knowledge, no
study has reported similar findings. For the same rest
interval after the last 25-m sprint (6 min in all trials),
velocity decreased when the previously performed
sprints were separated by short-duration intervals.
This is of practical importance for coaches when
aiming to design repeated sets of short-duration bouts.
Blood lactate concentration after all trials, irre-
spective of active or passive recovery, was similar at
the end of 8·25 m, and decreased after 6 min only
during the A120 and A45 trials. Despite these de-
creased values in the active recovery trials, blood
lactate concentration at the start of the 50-m sprint
test does not correlate with performance. Blood lactate
values may not represent the intramuscular lactate
content, and the interval time available for the re-
moval of this metabolite is crucial. If we co nsider the
total duration of the resting interval periods between
sprints, the time available for lactate removal was
about 9 min longer in the A120 and P120 (recovery
time 14 min) compared to the A45 and P45 trials
(recovery time 5.15 min). This would have affected the
amount of lactate removed from the muscle. It is
likely that higher muscle lac tate content was present in
the P45 and A45 compared to P120 and A120 trials.
The idea of lactate as a fatigue agent is outdated
(Gladden 2004), and several other hypotheses, mainly
based in vitro studies, have emerged (Westerblad and
Allen 2003). However, the contribution of H
ions to
muscular fatigue during whole-body sprint exercise
cannot be dismissed (Hermansen 1981; Spriet et al 1989).
There is evidence that muscle pH is further reduced even
after a dramatic reduction in the rate of anaerobic gly-
colysis during repeated sprints (Spriet et al. 1989;
Bogdanis et al. 1996a). Given the different recovery
duration between the 120 s and 45 s trials, it is likely
that the intramuscular acidity varied across trials after
the 8·25 m in our study. Thus, this effect on perfor-
mance in the 50-m sprint test should be considered, since
it may impair the glycolytic rate in a subsequent sprint
(Spriet et al. 1989 ).
In order to explain any differences in the 50-m sprint
performance, we should also take into accou nt the PCr
levels at the start of this bout, 6 min after the completion
of the 8·25 m. This becomes an important parameter
since PCr resynthesis cannot be completed within 6 min
after maximum exercise (Bogdanis et al. 1995 ), and its
availability is crucial for performance maintenance
during a sprint (Bogdanis et al. 1996a). Under these
conditions, PCr may have been recovered at higher
levels when a longer resting interval was applied. This
would have allowed a higher intramuscular content at
the end of 8·25 m in the P120 and A120 trials. Dawson
et al. (1997 ) have shown that PCr restorat ion may take
longer if this process starts at lower levels. Additionally,
any differences in the intramuscular pH may be con-
nected to the PCr resynthesis rate during the later stages
of recovery (McMahon and Jenkins 2002). Therefore, it
appears that any changes in the PCr content will affect
velocity in a 30–34 s sprint as in the present study.
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... Studies compared the effect of recovery mode (AR vs. PR) during an HIIE session on performancerelated conflicting results to find out the best recovery mode to achieve higher performance (time to exhaustion, mean power, distance) during the exercise session (Bazuelo-Ruiz et al., 2021;Bogdanis et al., 1996;Kostoulas et al., 2018;Signorile et al., 1993;Toubekis et al., 2005). However, two recent systematic reviews by Madueno et al. (2019) and (Perrier-Melo et al., 2020) examined the physiological, perceptual, and performance effects of active versus passive recovery applied between repeated-sprints. ...
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Introduction: Interval exercise is an effective training strategy frequently used by athletes to improve their performance in sports. It mainly involves high-intensity interval exercise and sprint interval exercise. Among them, the recovery mode is an integral part of an exercise session and can be classified as active recovery and passive recovery. Problem Statement: It has been suggested that the recovery mode during a repeated interval session can influence the performance during an acute session of exercise. Purpose: The aim of the study was to compare the effect of different recovery modes on performance during repeated sprint interval exercise. Methods: A randomized crossover study design with 16 healthy men (age: 20.63 ± 2.68 years, BMI: 23.21 ± 2.91 kg/m 2 , Body fat: 18.16 ± 4.28% kg, VO 2 peak: 44.9 ± 5.2 .min-1) recruited from a university population participated in this study who performed over three separate sessions with four repeated maximal 4 × 30 s all out active recovery, passive recovery or combined on a rowing ergometer. Results: No differences were found between recovery modes for VO 2 (PR: 42.96 ± 5.30; AR: 43.53 ± 5.71 and CR: 43.61 ± 4.18 .min-1), distance covered (PR: 149.8 ± 16.14m; AR: 152.6 ± 16.29m; CR: 147.4 ± 10.53m) and mechanical power (PR: 369.2 ± 92.6W; AR: 376.3 ± 104W; CR: 362.5 ± 98.7W). Conclusion: The results of the present investigation suggest that the recovery mode does not influence performance during a sprint interval rowing exercise session in healthy men. The recovery periods longer than four min are sufficient for complete restoration of power output, independent of the recovery mode. From a practical application, maintaining performance during the training sessions is important for preserving the volume load and intensity throughout the period. Therefore, practitioners also have the option of employing a combination of different recovery modes over time, as this may help in maintaining the performance. These findings have shown that the recovery modes (AR, PR, CP) are equally effective for maintaining the performance during SIE.
... Since "active recovery", defined as submaximal exercise or movement immediately following a training session, was first introduced in 1975 [7], its relative superiority over passive recovery has been reported in many studies [8][9][10][11]. Specifically, faster decreases of blood lactate [9], intramuscular pH level (due to reduced H+) [12], and oxyhemoglobin [13] as well as faster phosphocreatine resynthesis [14] ...
We compared the immediate effects of a cool-down strategy including an inverted body position (IBP: continuous 30-s alternations of supine and IBP) after a short period of an intense treadmill run with active (walking) and passive (seated) methods. Fifteen healthy subjects (22 years, 172 cm, 67 kg) completed three cool-down conditions (in a counterbalanced order) followed by a 5-min static stretch on three separate days. Heart rate, energy expenditure, blood lactate concentration, fatigue perception, and circumference of thighs and calves were recorded at pre- and post-run at 0, 5, 10, 20, and 30 min. At 5 min post-run, subjects performing the IBP condition showed (1) a 22% slower heart rate (p < 0.0001, ES = 2.52) and 14% lower energy expenditure (p = 0.01, ES = 0.48) than in the active condition, and (2) a 23% lower blood lactate than in the passive condition (p = 0.001, ES = 0.82). Fatigue perception and circumferences of thighs and calves did not differ between the conditions at any time point (F10,238 < 0.96, p < 0.99 for all tests). IBP appears to produce an effect similar to that of an active cool-down in blood lactate removal with less energy expenditure. This cool-down strategy is recommended for tournament sporting events with short breaks between matches, such as Taekwondo, Judo, and wrestling.
... Dies scheint im Kontext vieler Disziplinen jedoch kein relevanter Regenerationse ekt zu sein . Zum Beispiel konnte gezeigt werden, dass eine beschleunigte Laktatelimination keinen Ein uss auf die kurzfristige Wiederherstellung der körperlichen Leistungsfähigkeit hat (Weltman et al. 1979;Bond et al. 1991;Tokmakidis et al. 2006) oder diese durch aktive Erholung sogar negativ beein usst wurde (Dupont et al. 2003;Toubekis et al. 2005;Spencer et al. 2008). Darüber hinaus ist eine beschleunigte metabolische Homöostaseherstellung in vielen Sportarten auch deshalb irrelevant, da sie auch bei passiver Erholung nach bereits 60-90 min erreicht wird (Le Meur und Hausswirth 2013). ...
Ermüdung und Regeneration sind integrale Bestandteile des Trainingsprozesses. Dabei steht die kontinuierliche Leistungsentwicklung in ständiger Wechselwirkung mit den durch Trainings- und Wettkampfaktivitäten ausgelösten Ermüdungs- und Regenerationsvorgängen. Während die Steigerung der Trainingsqualität seit jeher im Fokus trainingswissenschaftlicher Bemühungen steht, richtet sich das Augenmerk zunehmend auch auf die Erholungsprozesse und deren Optimierung. Das Regenerationsmanagement lässt sich dabei im Wesentlichen in die Messung des Regenerationsbedarfs sowie in die individualisierte Planung und Anwendung von Regenerationsstrategien strukturieren. Hierbei ist die Bedeutung einer angemessenen Ernährung sowie von ausreichend Schlaf unbestritten. Zusätzlich kann in der (leistungs-)sportlichen Praxis aus einer Vielzahl an regenerationsfördernden Maßnahmen ausgewählt werden, deren Wirksamkeitsnachweis jedoch nur selten unter wissenschaftlich kontrollierten Bedingungen überzeugend erfolgt ist. Dies gilt sowohl für „traditionelle“ und bei den Athleten beliebte Maßnahmen wie beispielsweise die Massage als auch für neuartige Regenerationstrends wie Foam-Rolling oder für technologisch unterstützte Interventionsstrategien wie z. B. LED-Bestrahlung oder Kältekammern. Sowohl Ermüdungs- als auch Erholungsprozesse sind äußerst komplexe und multifaktorielle Phänomene, die in Abhängigkeit von den Belastungsmerkmalen sowie adressaten- und umweltspezifischen Besonderheiten auf verschiedenen Funktionsebenen des menschlichen Organismus (u. a. Muskulatur, Bindegewebe, zentrales Nervensystem, autonomes Nervensystem, endokrines System) in unterschiedlichen zeitlichen Dimensionen sowie in unterschiedlicher Geschwindigkeit und Ausprägung stattfinden. Basierend hierauf werden in diesem Kapitel sowohl die Wirkmechanismen und Effekte von Regenerationsinterventionen, die sich in der Sportpraxis großer Beliebtheit erfreuen, diskutiert als auch Grundlagen zum Ernährungsmanagement im Sport besprochen. Unter Berücksichtigung individueller und sportartspezifischer Rahmenbedingungen werden Praxistipps für die Regenerationssteuerung im (Leistungs-)Sport vorgestellt.
... Therefore, the findings of the present study support the concept of noncausality between lactate and performance, because of the superiority of passive over active recoveries, as no differences in blood lactate concentration were observed. These results are in agreement with previous swimming studies that verified the effect of different recoveries during HIIT sessions on performance and blood lactate (20,34,35). In the present study, although there was no significant difference between the recoveries in the peak lactate and the total volume of lactate removed during the HIIT sessions, when the total volume of lactate removed in the period after the HIIT sessions was observed, LAR showed lower concentrations of blood lactate and moderate effect size values of 26.8% 1.0 days, 28.9% 1.1 days, and 24.4% 0.9 days, compared with SPR, LPR, and SAR, respectively. ...
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Germano, MD, Sindorf, MAG, Crisp, AH, Braz, TV, Brigatto, FA, Nunes, AG, Verlengia, R, Moreno, MA, Aoki, MS, and Lopes, CR. Effect of different recoveries during HIIT sessions on metabolic and cardiorespiratory responses and sprint performance in healthy men. J Strength Cond Res XX(X): 000-000, 2019- The purpose of this study was to investigate how the type (passive and active) and duration (short and long) recovery between maximum sprints affect blood lactate concentration, O 2 consumed, the time spent at high percentages of V ̇ O 2 max, and performance. Participants were randomly assigned to 4 experimental sessions of high-intensity interval training exercise. Each session was performed with a type and duration of the recovery (short passive recovery-2 minutes, long passive recovery [LPR-8 minutes], short active recovery-2 minutes, and long active recovery [LAR-8 minutes]). There were no significant differences in blood lactate concentration between any of the recoveries during the exercise period (p > 0.05). The LAR presented a significantly lower blood lactate value during the postexercise period compared with LPR (p < 0.01). The LPR showed a higher O 2 volume consumed in detriment to the active protocols (p < 0.001). There were no significant differences in time spent at all percentages of V ̇ O 2 max between any of the recovery protocols (p > 0.05). The passive recoveries showed a significantly higher effort time compared with the active recoveries (p < 0.001). Different recovery does not affect blood lactate concentration during exercise. All the recoveries permitted reaching and time spent at high percentages of V ̇ O 2 max. Therefore, all the recoveries may be efficient to generate disturbances in the cardiorespiratory system.
... 10 In SIT protocols, similar beneficial performance outcomes were reported across a multitude of exercise modalities when recovery duration was increased between work intervals. 14,16,17,18 McEwan et al 17 compared the acute physiological responses and running performance in 12 × 30-second sprints, wherein the recovery duration was either fixed (30 s) or SS. The SS recovery time increased over the protocol ( Figure 1) and averaged 51 (15) seconds. ...
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Purpose: Over recent years, multiple studies have tried to optimize the exercise intensity and duration of work intervals in high-intensity-interval training (HIIT) protocols. Although an optimal work interval is of major importance to facilitate training adaptations, an optimal HIIT protocol can only be achieved with an adequate recovery interval separating work bouts. Surprisingly, little research has focused on the acute responses and long-term impact of manipulating recovery intervals in HIIT sessions. This invited commentary therefore aimed to review and discuss the current literature and increase the understanding of the moderating role of recovery durations in HIIT protocols. Conclusion: The acute responses to manipulations in recovery durations in repeated-sprint training (RST), sprint interval training (SIT), and aerobic interval training (AIT) protocols have recently begun to receive scientific interest. However, limited studies have manipulated only the recovery duration in RST, SIT, or AIT protocols to analyze the role of recovery durations on long-term training adaptations. In RST and SIT, longer recovery intervals (≥80 s) facilitate higher workloads in subsequent work intervals (compared with short recovery intervals), while potentially lowering the aerobic stimulus of the training session. In AIT, the total physiological strain endured per training protocol appears not to be moderated by the recovery intervals, unless the recovery duration is too short. This invited commentary highlights that further empirical evidence on a variety of RST, SIT, and AIT protocols and in exercise modalities other than cycling is needed.
... Forward walking (FW) has benefited from [1] Walking is a popular, convenient, and relatively safe form of exercise that holds great promise for weight management. [2] Walking has long been used by both rehabilitation and fitness professionals to help improve cardiovascular fitness and to rehabilitate musculoskeletal injuries. ...
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Objective: Walking on a treadmill is a common tool for lower extremity rehabilitation in the clinical setting. Backward walking (BW) shows significant differences with forward walking (FW) and these differences are potentially useful in rehabilitation. The aim of this study was to evaluate the effect of BW and FW on sports performance variables such as functional strength, balance, aerobic and anaerobic capacities of young healthy adults. Materials and Methods: Totally, 30 young healthy male subjects with a mean age of 26.1 ± 4.3 years participated in this study. Subjects were divided into two groups, forward walking group (FWG) and backward walking group (BWG) (n = 15) and performed forward and backward directions walking on a treadmill at consistent speed and 10% inclination, respectively, for duration of 6 weeks. Study outcomes such as functional strength, balance, aerobic and anaerobic capacities were measured on pre- and post-intervention. Results: The results of the study observed that lower limb functional strength, aerobic and anaerobic capacities were improved with BWG than FWG. However, the static and dynamic balances were showed no significant improvement between both walking groups. Conclusion: Backward walking training has been proved to be effective in improving the lower limb functional strength, aerobic and anaerobic capacities of the normal healthy individuals, whereas the balance components has to be studied in future in an extensive ways in BW.
Introduction: It has been suggested that recovery mode may contribute to performance during high - intensity interval exercise. However, there is no consensus regarding the effects of active and passive recovery modes on subsequent performance. To compare the effect of active versus passive recovery on performance during repeated high - intensity interval exercise. Evidence acquisition: Two reviewers independently conducted a search using the PRISMA systematic approach in three electronic databases (PubMed, Scopus and Cochrane CENTRAL) searching for randomized controlled trials (RCTs) comparing the effects of recovery mode on performance (until February 2020). Evidence synthesis: Twenty - six studies were included for analysis (17 for power output, nine for repeated-sprint ability and two for distance covered). Four studies found higher mechanical performance for passive recovery compared with active recovery. Six out of nine studies reported faster sprinting performance with passive recovery compared to active recovery. Two studies demonstrated that passive recovery resulted in a greater distance covered during intermittent sprint exercise. Conclusions: This systematic review suggests that performing high - intensity interval exercise with passive recovery results in greater performance when compared with active recovery.
Objective This study examines the effects of passive vs. active recovery at different percentages of maximum aerobic speed (MAS) on performance in a repeated sprint test and testosterone/cortisol ratio in basketball. Methods Sixteen basketball players performed a 20 m shuttle run test and randomly 4 repeated 10 × 30 m shuttle sprint tests with different types of recovery: passive and active at 50%, 35% and 20% of the MAS. Heart rate, RPE, Cortisol (C), testosterone (T) and blood lactate concentrations were measured during the sprint tests. Results The results showed that the total time (TT) and best time (BT) for repeated sprints are significantly higher during the passive recovery than the active ones. The performance recorded during active recovery at 20% of the MAS is significantly higher than those obtained at 35 and 50% of the MAS. There was no significant difference in lactate concentrations and T/C ratio between passive and active recovery. Significant correlations (r² > 50%) were recorded between total time and MAS for both types of recovery. Conclusion Passive recovery provides the best performance in repeated sprints. Also by comparing active recoveries, those of intensity below 35% of the MAS lead to a better performance in basketball players.
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BACKGROUND: Swimming requires sustained high performance, with limited recovery between heats, recovery strategies are essential to performance but are often self-regulated and sub- optimal. Accordingly, we investigated a physiologically determined recovery protocol. METHODS: Fifteen (m=9, f=6) international junior age group swimmers participated in this study. The average age of the participants was 15.8 ± 1.5 years. All participants completed a lactate elevation protocol (8 x 50 m sprints), followed by one of three recovery strategies, 1) velocity at lactate threshold (VLT), 2) coach prescribed protocol (COA) and 3) national governing body recommendations (NGB) and thereafter a 200-m time trial. RESULTS: [lac-]B was similar between trials at baseline (pooled data: 1.3 ± 0.4 mmol.l-1, P>0.05) but increased following 8x50 m sprints (pooled data 9.5 ± 3.5 mmol.l-1, P<0.05) and reduced in all conditions (mean reduction 6.4 ± 1.7 mmol.l-1). [lac-]B remained elevated following NGB (5.6 ± 0.8 mmol.l-1, P<0.05) compared with COA (2.3 ± 1.7 mmol.l-1) and VLT (1.7 ± 1.2 mmol.l-1) but was blunted during the 200-m time trial in VLT (6.4 ± 1.7 mmol.l-1, P<0.05). Time trial performance was similar between trials; VLT (2.24 ± 0.12 min), COA (2.23 ± 0.14 min) and NGB (2.22 ± 0.13 min, P>0.05). CONCLUSIONS: Despite similar performance, individually prescribed recovery strategy with a physiological basis will preserve repeated exercise performance performed on the same day.
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On two separate days eight male subjects performed a 10- or 20-s cycle ergometer sprint (randomized order) followed, after 2 min of recovery, by a 30-s sprint. Muscle biopsies were obtained from the vastus lateralis at rest, immediately after the first sprint and after the 2 min of recovery on both occasions.The anaerobic ATP turnover during the initial 10 s of sprint 1 was 129 ± 12 mmol kg dry weight−1 and decreased to 63 ± 10 mmol kg dry weight−1 between the 10th and 20th s of sprint 1. This was a result of a 300% decrease in the rate of phosphocreatine breakdown and a 35% decrease in the glycolytic rate. Despite this 51% reduction in anaerobic ATP turnover, the mean power between 10 and 20 s of sprint 1 was reduced by only 28%. During the same period, oxygen uptake increased from 1.30 ± 0.15 to 2.40 ± 0.23 L min−1, which partially compensated for the decreased anaerobic metabolism. Muscle pH decreased from 7.06 ± 0.02 at rest to 6.94 ± 0.02 after 10 s and 6.82 ± 0.03 after 20 s of sprinting (for all changes P < 0.01). Muscle pH did not change following a 2-min recovery period after both the 10- and 20-s sprints, but phosphocreatine was resynthesized to 86 ± 3 and 76 ± 3% of the resting value, respectively (n.s. 10- vs. 20-s sprint). Following 2 min of recovery after the 10-s sprint subjects were able to reproduce peak but not mean power. Restoration of both mean and peak power following the 20-s sprint was 88% of sprint 1, and was lower compared with that after the 10-s sprint (P < 0.01). Total work during the second 30-s sprint after the 10- and the 20-s sprint was 19.3 ± 0.6 and 17.8 ± 0.5 kJ, respectively (P < 0.01). As oxygen uptake was the same during the 30-s sprints (2.95 ± 0.15 and 3.02 ± 0.16 L min−1), and [Phosphocreatine] before the sprint was similar, the lower work may be related to a reduced glycolytic ATP regeneration as a result of the higher muscle acidosis.
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Six men were studied during four 30-s "all-out" exercise bouts on an air-braked cycle ergometer. The first three exercise bouts were separated by 4 min of passive recovery; after the third bout, subjects rested for 4 min, exercised for 30 min at 30-35% peak O2 consumption, and rested for a further 60 min before completing the fourth exercise bout. Peak power and total work were reduced (P < 0. 05) during bout 3 [765 +/- 60 (SE) W; 15.8 +/- 1.0 kJ] compared with bout 1 (1,168 +/- 55 W, 23.8 +/- 1.2 kJ), but no difference in exercise performance was observed between bouts 1 and 4 (1,094 +/- 64 W, 23.2 +/- 1.4 kJ). Before bout 3, muscle ATP, creatine phosphate (CP), glycogen, pH, and sarcoplasmic reticulum (SR) Ca2+ uptake were reduced, while muscle lactate and inosine 5'-monophosphate were increased. Muscle ATP and glycogen before bout 4 remained lower than values before bout 1 (P < 0.05), but there were no differences in muscle inosine 5'-monophosphate, lactate, pH, and SR Ca2+ uptake. Muscle CP levels before bout 4 had increased above resting levels. Consistent with the decline in muscle ATP were increases in hypoxanthine and inosine before bouts 3 and 4. The decline in exercise performance does not appear to be related to a reduction in muscle glycogen. Instead, it may be caused by reduced CP availability, increased H+ concentration, impairment in SR function, or some other fatigue-inducing agent.
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Physiological responses to repeated bouts of short duration maximal-intensity exercise were evaluated. Seven male subjects performed three exercise protocols, on separate days, with either 15 (S15), 30 (S30) or 40 (S40) m sprints repeated every 30 s. Plasma hypoxanthine (HX) and uric acid (UA), and blood lactate concentrations were evaluated pre- and postexercise. Oxygen uptake was measured immediately after the last sprint in each protocol. Sprint times were recorded to analyse changes in performance over the trials. Mean plasma concentrations of HX and UA increased during S30 and S40 (P less than 0.05), HX increasing from 2.9 (SEM 1.0) and 4.1 (SEM 0.9), to 25.4 (SEM 7.8) and 42.7 (SEM 7.5) mumol.l-1, and UA from 372.8 (SEM 19) and 382.8 (SEM 26), to 458.7 (SEM 40) and 534.6 (SEM 37) mumol.l-1, respectively. Postexercise blood lactate concentrations were higher than pretest values in all three protocols (P less than 0.05), increasing to 6.8 (SEM 1.5), 13.9 (SEM 1.7) and 16.8 (SEM 1.1) mmol.l-1 in S15, S30 and S40, respectively. There was no significant difference between oxygen uptake immediately after S30 [3.2 (SEM 0.1) l.min-1] and S40 [3.3 (SEM 0.4) l.min-1], but a lower value [2.6 (SEM 0.1) l.min-1] was found after S15 (P less than 0.05). The time of the last sprint [2.63 (SEM 0.04) s] in S15 was not significantly different from that of the first [2.62 (SEM 0.02) s]. However, in S30 and S40 sprint times increased from 4.46 (SEM 0.04) and 5.61 (SEM 0.07) s (first) to 4.66 (SEM 0.05) and 6.19 (SEM 0.09) s (last), respectively (P less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.
After exhaustive exercise the muscular store of creatine phosphate (CP) is almost completely depleted. The resynthesis of CP during recovery normally occurs rapidly, but is totally inhibited if the local circulation to the muscle is occluded. The limiting factor for CP resynthesis which could be a low intramuscular pH or availability of oxygen has been investigated in the present study. Biopsies from musculis quadriceps femoris of man were analyzed for pH, ATP, ADP, CP, creatine, lactate and pyruvate. It was shown that resynthesis of CP only occurs when the blood supply to the muscle is intact. From this it was concluded that the creatine kinase reaction is at a steady state or at equilibrium during the period of recovery. The influence of oxygen on the resynthesis of CP was investigated by incubating muscle samples taken after a fatiguing isometric contraction in atmospheres of oxygen and nitrogen, respectively. During 15 min incubation in oxygen CP was resynthesized from a starting value of 4% to 68% of the normal value at rest. No resynthesis was observed when parallel muscle samples were incubated for the same time in nitrogen. It is suggested that the initial fast phase of CP resynthesis is limited by the availability of oxygen whereas the subsequent slow phase is limited by the hydrogen ion transport out from the muscle.
In order to examine the effects of different recoveries from high intensity short duration exercise on lactate removal and subsequent performance, 11 subjects completed 8 experimental sessions. Each subject completed an initial all-out pedaling task against 5.5 kg resistance (Monark bicycle ergometer) for 1 min followed by a randomly assigned recovery pattern and a repeat of the all-out exercise task. The main effects examined were active (1.0 kg, 60 rpm) vs passive recovery, inhalation of inhalation of oxygen vs room air during recovery, and 10- vs-20-min duration of recovery. Pedal revolutions were analyzed on a 6- by 6-sec and on a cumulative basis. Blood lactate concentrations were determined during rest, the 3rd–4th, 9th–10th, and 19th–20th min of recovery. Results revealed significant main effects for active vs passive recovery and for 10- vs 20-min recovery, with active and 20-min recovery resulting in significantly higher postrecovery pedal revolutions (p < .001) and enhanced rates of lactate removal during recovery (p < .001). Oxygen inhalation during recovery had no effect on postrecovery performance or lactate removal (p > .05). The correlation between blood lactate levels at the end of recovery and pedal revolutions on the postrecovery exercise task was only r = -.19, suggesting that factors other than lactate removal are critical for subsequent performance.
The effects of differing recovery patterns following maximal exercise on blood lactate disappearance and subsequent performance were examined. Nine subjects completed four randomly assigned experimental sessions. Each session consisted of a 5-min maximal effort performance test conducted on a Monark bicycle ergometer (T1) followed by 20 min of recovery and a second 5-min maximal effort performance test (T2). Blood lactate levels were measured during min 5, 10, 15, and 20 of recovery. Recovery patterns consisted of passive recovery (PR), active recovery below anaerobic threshold (AR less than AT), active recovery above anaerobic threshold (AR greater than AT), and active recovery above anaerobic threshold while breathing 100% oxygen (AR greater than AT + O2). Blood lactate levels prior to T2 were significantly different across treatments (P less than 0.05). Comparison among treatments and between T1 and T2 revealed no significant differences in work output. It was concluded that while lactate disappearance following severe exercise can be affected by varying the recovery pattern, elevated levels of blood lactate exert no demonstrable effect on maximal effort performance of 5-min duration.