Article

RPE, pain, and physiological adjustment to concentric and eccentric contractions.

Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond 70402, USA.
Medicine &amp Science in Sports &amp Exercise (Impact Factor: 4.48). 07/2003; 35(6):1017-25. DOI: 10.1249/01.MSS.0000069749.13258.4E
Source: PubMed

ABSTRACT The purpose of the study was to compare perceptual (RPE and pain), cardiac (heart rate), lactate, and endocrine (cortisol) responses with concentric (CON) and eccentric (ECC) resistance exercise protocols using the same absolute workload.
Eight healthy men with resistance-training experience participated in the study. Subjects completed two experimental trials consisting of either CON contractions or ECC contractions at the same absolute workload for each of four exercises: bench press, leg extension, military press, and leg curl. Subjects performed four sets of 12 repetitions at 80% of 10-RM with 90-s rest periods. Blood samples were taken before, immediately after, and 15-min postexercise.
There was a significant trial effect for RPE, with CON exercise eliciting a higher RPE than ECC exercise (6.71 +/- 0.51 and 4.10 +/- 0.27, respectively). A significant trial effect was also demonstrated for pain, with CON exercise producing a higher pain rating than ECC exercise (5.59 +/- 0.41 and 3.23 +/- 0.27, respectively). Significantly higher heart rates and lactates were also demonstrated during the CON trial. For cortisol, a significant interaction was revealed between the pre- and immediate posttrial measures but not an overall trial effect. Correlational analyses revealed a significant relationship between RPE and pain for both trials.
CON exercise elicits greater perceptual (higher RPE and pain rating), cardiac, lactate and cortisol response than ECC exercise at the same absolute workload. Data demonstrate that relative to absolute load, RPE and pain respond to resistance exercise in a similar fashion. Additionally, physiological cues are consistent with these perceptual data.

1 Bookmark
 · 
166 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: We sought to determine if blood flow restriction (BFR) by itself or in combination with exercise would result in prolonged decrements in torque when using restriction pressures relative to the participants' limb size. Sixteen participants were randomized into Experiment A (n = 9) or Experiment B (n = 7). Experiment A participants performed unilateral knee extensions at 30 % of their one repetition maximum (1RM) with moderate blood flow restriction on one leg (BFR + Exercise) and exercised the other leg without BFR (CON + Exercise). Experiment B participants rested for 4 min with BFR applied to one leg and rested for 4 min without any treatment on the other leg (CON). Maximal voluntary isometric torque (MVC) was measured before and immediately after the exercise or 4 min of rest, 1 h post, and 24 h post. Ratings of perceived exertion (RPE) and discomfort were taken before and after each set. MVC was significantly reduced following both exercise conditions with BFR + Exercise having the largest reduction in torque. However, torque quickly recovered by 1 h post exercise and was back to baseline by 24 h. No changes in torque were observed in Experiment B. RPE and discomfort were rated consistently higher for those in the BFR + Exercise and BFR conditions compared to control. In conclusion, BFR + Exercise does not result in prolonged decrements in torque. The acute changes in torque are due to fatigue and quickly recover back to baseline within 24 h of exercise. In addition, BFR in the absence of exercise has no effect on torque at any time point.
    Arbeitsphysiologie 09/2012; · 2.66 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to investigate the potential mechanisms behind the blood flow restriction (BFR) stimulus in the absence of exercise. Nine participants completed a 10 minute time control and then a BFR protocol. The protocol was five, 5-minute bouts of inflation with 3-minutes of deflation between each bout. The pressure was set relative to each individual's thigh circumference. Significant increases in muscle thickness were observed for both the vastus lateralis (VL) [6%, p = 0.027] and rectus femoris (RF) [22%, p = 0.001] along with a significant decrease in plasma volume [15%, p = 0.001]. Ratings of discomfort during the BFR protocol peaked at 2.7 (light discomfort). There were no significant changes with whole blood lactate, electromyography (EMG), or heart rate (HR), however, there was a trend for a significant increase in HR during the 5th inflation (p = 0.057). In conclusion, this is the first study to demonstrate that the attenuation of both muscle atrophy and declines in strength previously observed with brief applications of BFR may have been mediated through an acute fluid shift induced increase in muscle size. This is supported by our finding that the changes in muscle thickness are maintained even after the cuffs have been removed.
    Acta Physiologica Hungarica 12/2012; 99(4):400-10. · 0.88 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: OBJECTIVE: To assess the safety and acute effects of a procedure using perceived exertion during a prior submaximal concentric (CON) test to individualize eccentric (ECC) cycling exercise intensity. DESIGN: Prospective monocentric open study. SETTING: Technological Investigation Platform at the Physical Medicine and Rehabilitation Department, Dijon University Hospital. PARTICIPANTS: Eighteen healthy subjects aged between 22 and 37 years (15 men, 3 women) INTERVENTIONS: The subjects performed 3 cycling exercises: (1) incremental CON test to determine the comfortable pedalling power (CPP) corresponding to a Borg scale rating of 12 (rate of perceived exertion); (2) steady state CON exercise at the CPP workload to determine the corresponding plantar pressure; (3) steady state ECC exercise with an imposed resistance corresponding to the CPP plantar pressure. MAIN OUTCOME MEASURES: Rate of perceived exertion on Borg scale, oxygen uptake (VO2), heart rate, cardiac output and stroke volume using inert gas rebreathing techniques were measured during steady state CON and ECC exercises. Muscle soreness was rated on a visual analogic scale immediately, 24 and 48h after the tests. RESULTS: No adverse effects were reported. VO2 was about five times the resting value during CON exercise, while it was twice that during ECC exercise. Cardiac output was lower during ECC exercise (p<0.05), this moderate increase was exclusively linked to a greater increase in stroke volume during ECC exercise than during CON exercise (p<0.05). CONCLUSION: Moderate intensity ECC cycling exercise tailored according to perceived exertion during a prior CON test is well tolerated. It corresponds to limited muscular use of oxygen and to an isolated increase in stroke volume. It appears to be a feasible procedure for pre-conditioning before ECC training.
    Archives of physical medicine and rehabilitation 12/2012; · 2.18 Impact Factor

Full-text (2 Sources)

View
44 Downloads
Available from
May 21, 2014