[Show abstract][Hide abstract] ABSTRACT: This study determined the validity and the reliability of a new specific field test that was based on the scientific data that exist within the latest literature research.
Seventeen international level karatekas participated in this study: 14 men (age: 24.1±4.6 years, body mass: 65.7±10.8 kg) and 3 women (age: 19±3.6 years, body mass: 54.1±0.9 kg). All performed the new karate specific test (KST) two times (test and retest sessions were carried out on separated occasions one week apart). Thirteen men performed also a laboratory test for assessing maximal oxygen uptake (VO2max).
Test-retest results showed the KST to be reliable. VO2peak, Peak heart rate (HRpeak), blood lactate ([La-]), rating of perceived exertion (RPE), and time to exhaustion (TE) did not display a difference between the test and the retest. The SEM and ICC for relative and absolute VO2peak, and TE were <5% and >0.90, respectively. Significant correlations were found between VO2peak (mL.kg-1.min-1) and TE measured from the KST (r=0.71, 95%CI: 0.35-0.88,p<0.0001). There was also no significant difference between VO2peak measured from the KST and VO2max recorded from the cyclo-ergometer laboratory test (55.1±4.8 vs 53.2±6.6 mL.kg-1.min-1, respectively) (t=-1.85, df=12, p=0.08, dz=0.51 [small]). The Bland and Altman analyses reported a mean difference (bias) ± the 95% limits of agreement of 1.9±7.35 mL.kg-1.min-1.
This study showed that the new KST test, with effort pattern replicating real karate combats, can be considered as a valid and reliable karate specific field test for assessing the endurance fitness of karatekas.
International journal of sports physiology and performance 03/2014; · 2.25 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: tTrained breath-hold divers (BHDs) are exposed to repeated bouts of intermittent hypoxia and hyper-capnia during prolonged breath-holding. It has thus been hypothesized that their specific training maydevelop enhanced chemo-responsiveness to hypoxia associated with reduced ventilatory response tohypercapnia.Hypercapnic ventilatory responses (HCVR) and hypoxic ventilatory responses at rest (HVRr) and exer-cise (HVRe) were assessed in BHDs (n = 7) and a control group of non-divers (NDs = 7). Cardiac output (CO),stroke volume (SV) and heart rate (HR) were also recorded. BHDs presented carbon dioxide sensitivitysimilar to that of NDs (2.85 ± 1.41 vs. 1.85 ± 0.93 L min−1mmHg−1, p > 0.05, respectively). However, bothHVRr(+68%) and HVRe(+31%) were increased in BHDs. CO and HR reached lower values in BHDs thanNDs during the hypoxic exercise test.These results suggest that the exposure to repeated bouts of hypoxia/hypercapnia frequently experi-enced by trained breath-hold divers only enhances their chemo-responsiveness to poikilocapnic hypoxia,without altering HCVR.
[Show abstract][Hide abstract] ABSTRACT: Maximal or peak oxygen uptake ([Formula: see text] and [Formula: see text], respectively) are commonly measured during graded exercise tests (GXTs) to assess cardiorespiratory fitness (CRF), to prescribe exercise intensity and/or to evaluate the effects of training. However, direct measurement of CRF requires a GXT to volitional exhaustion, which may not always be well accepted by athletes or which should be avoided in some clinical populations. Consequently, numerous studies have proposed various sub-maximal exercise tests to predict [Formula: see text] or [Formula: see text]. Because of the strong link between ratings of perceived exertion (RPE) and oxygen uptake ( [Formula: see text]), it has been proposed that the individual relationship between RPE and [Formula: see text] (RPE:[Formula: see text]) can be used to predict [Formula: see text] (or [Formula: see text]) from data measured during submaximal exercise tests. To predict [Formula: see text] or [Formula: see text] from these linear regressions, two procedures may be identified: an estimation procedure or a production procedure. The estimation procedure is a passive process in which the individual is typically asked to rate how hard an exercise bout feels according to the RPE scale during each stage of a submaximal GXT. The production procedure is an active process in which the individual is asked to self-regulate and maintain an exercise intensity corresponding to a prescribed RPE. This procedure is referred to as a perceptually regulated exercise test (PRET). Recently, prediction of [Formula: see text] or [Formula: see text] from RPE:[Formula: see text] measured during both GXT and PRET has received growing interest. A number of studies have tested the validity, reliability and sensitivity of predicted [Formula: see text] or [Formula: see text] from RPE:[Formula: see text] extrapolated to the theoretical [Formula: see text] at RPE20 (or RPE19). This review summarizes studies that have used this predictive method during submaximal estimation or production procedures in various populations (i.e. sedentary individuals, athletes and pathological populations). The accuracy of the methods is discussed according to the RPE:[Formula: see text] range used to plot the linear regression (e.g. RPE9-13 versus RPE9-15 versus RPE9-17 during PRET), as well as the perceptual endpoint used for the extrapolation (i.e. RPE19 and RPE20). The [Formula: see text] or [Formula: see text] predictions from RPE:[Formula: see text] are also compared with heart rate-related predictive methods. This review suggests that [Formula: see text] (or [Formula: see text]) may be predicted from RPE:[Formula: see text] extrapolated to the theoretical [Formula: see text] (or [Formula: see text]) at RPE20 (or RPE19). However, it is generally preferable to (1) extrapolate RPE:[Formula: see text] to RPE19 (rather than RPE20); (2) use wider RPE ranges (e.g. RPE ≤ 17 or RPE9-17) in order to increase the accuracy of the predictions; and (3) use RPE ≤ 15 or RPE9-15 in order to reduce the risk of cardiovascular complications in clinical populations.
[Show abstract][Hide abstract] ABSTRACT: Trained breath-hold divers (BHDs) are exposed to repeated bouts of intermittent hypoxia and hypercapnia during prolonged breath-holding. It has thus been hypothesized that their specific training may develop enhanced chemo-responsiveness to hypoxia associated with reduced ventilatory response to hypercapnia. Hypercapnic ventilatory responses (HCVR) and hypoxic ventilatory responses at rest (HVRr) and exercise (HVRe) were assessed in BHDs (n=7) and a control group of non-divers (NDs=7). Cardiac output (CO), stroke volume (SV) and heart rate (HR) were also recorded. BHDs presented carbon dioxide sensitivity similar to that of NDs (2.85±1.41 vs. 1.85±0.93 l.min(-1).mmHg(-1), p>0.05, respectively). However, both HVRr (+68%) and HVRe (+31%) were increased in BHDs. CO and HR reached lower values in BHDs than NDs during the hypoxic exercise test. These results suggest that the exposure to repeated bouts of hypoxia/hypercapnia frequently experienced by trained breath-hold divers only enhances their chemo-responsiveness to poikilocapnic hypoxia, without altering HCVR.
[Show abstract][Hide abstract] ABSTRACT: Investigate the physiological responses and rating of perceived exertion (RPE) in elite karate athletes and examine the relationship between a subjective method (Session-RPE) and two objective heart-rate (HR)-based methods to quantify training-load (TL) during international karate competition.
Eleven karatekas took part in this study, but only data from seven athletes who completed three matches in an international tournament were used (four men and three women). The duration of combat was 3 min for men and 2 min for women, with 33.6±7.6 min for the first interval period (match 1-2) and 14.5±3.1 min for the second interval period (match 2-3). HR was continuously recorded during each combat. Blood lactate [La(-)] and (RPE) were measured just before the first match and immediately after each match.
Means total fights time, HR, %HRmax, [La(-)], and session-RPE were 4.7±1.6 min, 182±9 bpm, 91±3%, 9.02±2.12 mmol.L(-1) and 4.2±1.2, respectively. No significant differences in %HRmax, [La(-)], and RPE were noticed across combats. Significant correlations were observed between RPE and both resting HR (r=0.60; P=0.004) and mean HR (r=0.64; P=0.02), session-RPE and Banister training-impulse (TRIMP) (r=0.84; P<0.001) and Edwards TL (r=0.77; P<0.01).
International karate competition elicited near-maximal cardiovascular responses and high [La(-)]. Training should therefore include exercise bouts that sufficiently stimulate the zone between 90 and 100% HRmax. Karate coaches could use the RPE-method to follow competitor's competition loads and consider it in their technical and tactical training.
Asian journal of sports medicine. 12/2013; 4(4):263-71.
[Show abstract][Hide abstract] ABSTRACT: Voluntary breath-holding (BH) elicits several hemodynamic changes, but little is known about maximal static immersed-body BH. We hypothesized that the diving reflex would be strengthened with body immersion and would spare more oxygen than maximal dry static BH, resulting in a longer BH duration.
Eleven trained breath-hold divers (BHDs) performed a maximal dry-body BH and a maximal immersed-body BH. Cardiac output (CO), stroke volume (SV), heart rate (HR), left ventricular end-diastolic volume (LVEDV), contractility index (CTI), and ventricular ejection time (VET) were continuously recorded by bio-impedancemetry (PhysioFlow PF-05). Arterial oxygen saturation (SaO2) was assessed with a finger probe oximeter.
In both conditions, BHDs presented a bi-phasic kinetic for CO and a tri-phasic kinetic for SV and HR. In the first phase of immersed-body BH and dry-body BH, results (mean ± SD) expressed as percentage changes from starting values showed decreased CO (55.9 ± 10.4 vs. 39.3 ± 16.8 %, respectively; p < 0.01 between conditions), due to drops in both SV (24.9 ± 16.2 vs. 9.0 ± 8.5 %, respectively; p < 0.05 between conditions) and HR (39.7 ± 16.7 vs. 33.6 ± 17.0 %, respectively; p < 0.01 between conditions). The second phase was marked by an overall stabilization of hemodynamic variables. In the third one, CO kept stabilizing due to increased SV (17.0 ± 20.2 vs. 10.9 ± 13.8 %, respectively; p < 0.05 between conditions) associated with a second HR drop (14.0 ± 10.0 vs. 12.7 ± 8.9 %, respectively; p < 0.01 between conditions).
This study highlights similar time-course patterns for cardiodynamic variables during dry-body and immersed-body BH, although the phenomenon was more pronounced in the latter condition.
[Show abstract][Hide abstract] ABSTRACT: Introduction
The graded exercise test (GXT) is used to measure the exercise capacity of patients with chronic obstructive pulmonary disease (COPD). To do this GXT must be maximal (exhaustive). However, the value of the blood lactate at the GXT endpoint [La−max] or after a recovery period of three minutes [La−recovery], to confirm that the GXT is maximal, remains controversial. The purpose of the present study is to determine a threshold of [La−max] and/or [La−recovery], which confirms the exhaustiveness of GXT in patients with COPD.
Thirty-six patients with COPD performed a GXT until exhaustion on a cycle ergometer. During the GXT cardiorespiratory parameters, [La−max] and [La−recovery] were measured. When at least three out of five of the most frequently used criteria to confirm exhaustion were met, GXT was considered as maximal. Conversely, GXT was considered as sub-maximal when less three criteria were observed. The receiver operating characteristic (ROC) curves were analyzed.
For [La−max] the areas under the ROC curve and the areas under the diagonal were not significantly different (P = 0.16). For [La−recovery] the ROC curve inflected itself at 5.8 mmol/L (sensitivity = 0.92 and specificity = 0.56).
It was not possible to use [La−max] to confirm exhaustion in our population. However, [La−recovery] < 5.8 mmol/L may help to confirm non-exhaustion during GXT in patients with COPD. Below this blood lactate threshold 93% patients performed a sub-maximal GXT.
Revue des Maladies Respiratoires. 03/2013; 30(3):187–193.
[Show abstract][Hide abstract] ABSTRACT: While some studies have demonstrated that respiratory muscle endurance training (RMET) improves performances during various exercise modalities, controversy continues about the transfer of RMET effects to swimming performance. The objective of this study was to analyze the added effects of respiratory muscle endurance training (RMET; normocapnic hyperpnea) on the respiratory muscle function and swimming performance of young well-trained swimmers. Two homogenous groups were recruited: ten swimmers performed RMET (RMET group) and ten swimmers performed no RMET (control group). During the 8-week RMET period, all swimmers followed the same training sessions 5-6 times/week. Respiratory muscle strength and endurance, performances on 50- and 200-m trials, effort perception, and dyspnea were assessed before and after the intervention program. The results showed that ventilatory function parameters, chest expansion, respiratory muscle strength and endurance, and performances were improved only in the RMET group. Moreover, perceived exertion and dyspnea were lower in the RMET group in both trials (i.e., 50- and 200-m). Consequently, the swim training associated with RMET was more effective than swim training alone in improving swimming performances. RMET can therefore be considered as a worthwhile ergogenic aid for young competitive swimmers. Key PointsRespiratory muscle endurance training improves the performance.Respiratory muscle endurance training improves the ventilatory function parameters, chest expansion, respiratory muscle strength and endurance.Respiratory muscle endurance training decreases the perceived exertion and dyspnea.Respiratory muscle endurance training can be considered as a worthwhile ergogenic aid for young competitive swimmers.
Journal of sports science & medicine 01/2013; 12(4):630-8. · 0.89 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: USING EFFORT PERCEPTION TO QUANTIFY THE TRAINING LOAD DURING DIFFERENT MODES OF KARATE TRAINING SESSIONS
M. Tabben, Dr. R. Sioud, Dr. J. Coquart, Pr. K. Chamari and Pr. C. Tourny-Chollet.
CETAPS, University of Rouen, Mont Saint Aignan, France.
The objectives of the present study were (1) to determine the relationship between a subjective method of quantifying karate training loads (TLs) (the session rating of perceived exertion: session-RPE) and two objective methods (the training impulse: Banister’s TRIMP, and the summated-heart-rate-zones equation: Edwards’ TL) and (2) to explain the characteristics of the variance for different training modes. Twelve international karate athletes (5 women and 7 men, age: 23.0±1.7 yrs) were recruited. RPE and heart rate (HR) were recorded to calculate the training loads in 171 karate training sessions. Correlation analysis assessed the validity between session-RPE and the 2 HR-based methods for TL assessment in a variety of training modes: technical training, special physical training and Randori. The HR was 131±14 bpm, 134±14 bpm and 137±15 bpm, respectively. No significant difference was found between the session-RPE according to training mode. The cumulative duration in the 90-100% zone of maximum HR was 2.52 min in technical training, whereas the duration in the same zone was 8.39 min in Randori sessions. The correlation between the TRIMP and session-RPE was r=0.87 (95% Confidence Interval: 0.72 to 0.95). The correlation between session-RPE and Edwards’ TL was r=0.85 (95% Confidence Interval: 0.71 to 0.95). Karate coaches can use the RPE method to monitor karate training, although they should ensure that the Randori sessions are of high intensity to simulate the physiological responses of competition.
XXXII WORLD CONGRESS OF SPORTS MEDICINE Rome; 09/2012
[Show abstract][Hide abstract] ABSTRACT: Objective
The objective was to examine the relationship between rating of perceived exertion (RPE) at the point of maximal lipids oxidation (LIPOXmax), physiological responses and psychological profile in trained competitive cyclists.
Patients and methods
Twenty-one competitive cyclists performed an exercise test in order to determine RPE at LIPOXmax. During this exercise test, physiological responses at LIPOXmax were measured. Moreover, a psychological profile for each cyclist has been evaluated from questionnaires (levels of anxiety, desire for success, self-esteem, psychological resistance and endurance, dynamism, competitiveness, activity control, risk-taking, emotional control, extroversion–introversion, leadership, aggressiveness, sociability, cooperation, acceptance of a judgment, and social desirability). Multiple linear regression analysis was performed to determine the physiological and psychological factors linked to RPE at LIPOXmax.
Only the percentage of maximal oxygen uptake (%V˙O2max), leadership and psychological endurance explained significantly the RPE at LIPOXmax.
More the cyclists have a low RPE at LIPOXmax, more their LIPOXmax (in V˙O2max) was low. Cyclists with high level of leadership (i.e., persuasive, with command ability) and/or psychological endurance (i.e., persistent, obstinate) have lower RPE at LIPOXmax than the cyclists with lower level of leadership and/or psychological endurance.
[Show abstract][Hide abstract] ABSTRACT: The ability to predict performance is of great interest for athletes and coaches. It is helpful for the selection of athletes to a team, the prescription of individualized training and the determination of the optimal pacing strategy. However, it is often difficult to judge the time to exhaustion without maximal exercise testing, which is often difficult to schedule during a competitive season. Consequently, the purpose of this review is to present a recent tool based on subjective prediction of time to exhaustion than can be achieved without requiring a maximal effort. This tool is the estimated time limit (ETL) scale. This review summarizes all experimentations that have studied the ETL scale. These studies suggest that the ETL scale may be used to predict time to exhaustion.
Sports Medicine 08/2012; 42(10):845-55. · 5.32 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Prothrombin complex concentrate (PCC) for reversal of vitamin K antagonist (VKA) is the main therapeutic option in cases of life-threatening bleeding. Clinical use of PCC is poorly documented.
We prospectively assessed PCC use in four French emergency departments during a two year period 2006-2008 before publication of French Guidelines. An appropriate treatment was defined when PCC was recommended, with a dose of PCC above or equal to 20 UI/kg, with vitamin K and with an assessment of international normalized ratio (INR) after PCC. Time of diagnosis and PCC administration were collected, as INR values, thromboembolic events within seven days, hospital mortality.
256 patients received PCC for reversal of OAT. PCC was mainly prescribed for major intracerebral (ICH) or gastrointestinal hemorrhage. An appropriate treatment was observed in 26% of patients. Intra-hospital mortality for major bleeding was 33% for ICH and 26% for non-ICH major bleeding. A PCC dose>20 UI/kg was able to reach an INR<1.5 in 65% of patients. For major hemorrhages (70%), time between patient arrival and treatment delivery exceeded three hours in half of cases. Control of INR was omitted in 20% of patients. No patients presented a thromboembolic event.
A suitable treatment was administered in 26% of patients. A PCC dose of 20-30 IU/kg seems adequate in most cases to reverse VKA activity, but both higher and lower doses achieve similar effects. Considerable progress is required to improve PCC administration and control of treatment efficacy, and to shorten time to diagnosis.
Thrombosis Research 06/2012; 130(3):e178-83. · 3.13 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The purpose of this study was to evaluate the validity of the estimated time limit scale (ETL), which deals with a subjective prediction of how long the current exercise intensity can be maintained, for regulating exercise intensity using typical estimation-production procedure. Thirty-six male athletes performed a continuous incremental test and two discontinuous tests with randomized workloads (estimation tests at 65, 75, 85 and 95% of the maximal power output, and production tests: subjects have to use the ETL values which were collected for each power during the estimation test in order to manually product the corresponding workload). The intraclass correlation coefficient for the power output between estimation and production tests is good for exercises at 75, 85 and 95% MAP (0.81, 0.85 and 0.96, respectively). Moreover, mean differences both for power output and cardiorespiratory data were not significantly different between estimation and production tests for exercises at 85 and 95% MAP. Consequently, the validity to prescribe an exercise intensity from the ETL scale is attested in these athletes particularly for high exercise intensities on cycloergometer.
[Show abstract][Hide abstract] ABSTRACT: Prediction of time to exhaustion in competitive cyclists from a perceptually based scale. We have tested the validity of the estimated time limit (ETL) scale to predict an exhaustion time (T(lim)) from values stemming from incremental and randomized constant workloads tests on a cycle ergometer. Twenty-five cyclists performed 1 continuous incremental test, 1 discontinuous test with randomized workloads, and 1 constant power output test at 90% of maximal aerobic power (MAP) to exhaustion. Estimated time limits at 90% MAP during the incremental test and the test with randomized workloads were calculated from exponential relationships between power and ETL using the same 4 workloads. Real measured T(lim) during the constant power output test was converted into ETL values (called measured ETL). The differences between the calculated and measured ETLs were examined. Estimated time limits calculated at 90% MAP during the incremental and randomized tests corresponded to 14 minutes 56 seconds and 10 minutes 14 seconds, whereas measured ETL was equal to 11 minutes 19 seconds ± 3 minutes 40 seconds. The results showed a nonsignificant difference between calculated and measured ETLs. However, the mean differences between the measured ETL values during the constant test performed at the same intensity were -1.3 ± 2.9 and 0.3 ± 3.0 for the incremental and the randomized constant workloads tests, respectively. Consequently, the use of ETL calculated at 90% MAP during the test with randomized constant workloads may be preferable to predict the accurate T(lim). Moreover, it would seem that high-level cyclists, who were more consciously attuned to their bodies and their own effort sense, were more accurate in their prediction than low-level cyclists. It is concluded that the randomized constant workloads test that is both shorter and less strenuous would be more convenient for high-level athletes.
The Journal of Strength and Conditioning Research 02/2011; 25(5):1393-9. · 1.80 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Objectifs
Les objectifs étaient d’examiner l’influence du niveau de performance sur le point d’oxydation maximale des lipides (Lipoxmax) chez des cyclistes, et d’identifier les zones d’intensités cibles correspondantes au Lipoxmax.
Patients et méthodes
Vingt-quatre cyclistes entraînés étaient répartis en deux groupes en fonction de leur niveau de performance en cyclisme (G1: 17 cyclistes de niveau départemental à régional versus G2: sept cyclistes élites ou professionnels). Tous les cyclistes (G1 et G2) réalisaient un même test de calorimétrie d’effort, durant lequel les paramètres cardiorespiratoires et la perception de l’effort (RPE) étaient mesurés. Le Lipoxmax était identifié, puis exprimé sous la forme d’un pourcentage de la puissance maximale aérobie (PMA), de la consommation maximale d’oxygène (V˙O2max), de la consommation d’oxygène de réserve (V˙O2réserve), de la fréquence cardiaque maximale (FCmax), de la fréquence cardiaque de réserve (FCréserve) et à une valeur de RPE. Ces valeurs étaient ensuite comparées par une Anova à une voie (G1 versus G2).
Les intervalles de confiance à 95 % (IC95 %) du Lipoxmax correspondait à 37–44 % PMA, 41–47 % V˙O2max, 35–42 % V˙O2réserve, 44–59 % FCréserve et à RPE 8–10, indépendant du groupe (p > 0,05). Toutefois, un effet groupe était noté lorsque le Lipoxmax était exprimé en pourcentage de la FCmax (IC95 % = 56–61 % et 60–70 % FCmax pour G1 et G2, respectivement; p = 0,03). Cependant, une large dispersion des valeurs de Lipoxmax était constatée.
Chez ces cyclistes, le niveau de performance n’influence pas le Lipoxmax (sauf lorsque ce dernier est exprimé en % FCmax). Il semble toutefois difficile d’utiliser des intensités cibles communes pour prescrire l’intensité d’exercice au Lipoxmax chez ces cyclistes.
[Show abstract][Hide abstract] ABSTRACT: Introduction
Deux cent cinquante patients diabétiques de type 1 (DT1) ont été formés à ce jour au sein de notre centre référent pour le traitement par pompe ambulatoire (PA) d’insuline depuis avril 2001. Nous avons étudié l’évolution de l’équilibre glycémique chez 104 patients traités par PA depuis plus de 5 ans, dont 52 depuis plus de 7 ans.
Patients et méthodes
A l’admission, les patients avaient en moyenne 41,2 ans, un IMC à 25,2 ± 4,8 kg/m2 et une HbA1C de 8,3 % ± 1,2 %. Les patients étaient à 48,1 % des hommes contre 51,9 % de femmes. De plus 48,1 % avaient une rétinopathie, 19,4 % une néphropathie et 15,4 % une neuropathie diabétiques. Après la mise en place de la PA, un suivi à 1 an, 3 ans, 5 et 7 ans était réalisé. Lors de ce suivi l’IMC, l’HbA1c, la qualité de vie étaient mesurés. Aprés 1 an de traitement 2 groupes étaient constitués. Le groupe BC (bon contrôle glycémique) était constitué de patients avec une chute d’HbA1c d’au moins 0,3 % ; le groupe MC (mauvais contrôle glycémique) était composé de patients avec une chute d’HbA1c inférieure à 0,3 % (ou une augmentation). 79,6 % des patients appartenaient au groupe BC.
Pour l’ensemble des patients, l’HbA1c était significativement plus faible à 1 an (7,3 ± 1 %), à 3 ans (7,6 ± 1,1 %), à 5 (7,5 ± 0,9 %) et 7 ans (7,6 ± 1 %), en comparaison à l’admission, p < 0,001. L’IMC était significativement plus élevé à 1 an (25,8 ± 4,7 kg/m2), 3 ans (26,0 ± 4,9 kg/m2), 5 ans (26,5 ± 5 kg/m2) et 7 ans (26,8 ± 5,9 kg/m2) en comparaison à l’admission. La qualité de vie (évaluée selon une échelle visuelle analogique) était significativement améliorée aprés la mise en place de la PA (score : 6,2 ± 1,4 à l’admission versus 8,2 ± 1,1 à 1 an, 7,8 ± 1,2 à 3 ans, 8,0 ± 1,1 à 5 ans et 8,0 ± 0,9 à 7 ans ; p < 0,001.
La catégorie socioprofessionnelle des patients n’influençait pas significativement la valeur d’HbA1c (p 0,36).
Aprés 1 an de traitement, le groupe BC avait une diminution significative de la valeur d’HbA1c.
(− 1,2 %à 1 an, − 1 % à 3 ans, −0,9 % à 5 ans et − 0,9 % à 7 ans, en comparaison à l’admission ; p < 0,001). Pour le groupe MC, la valeur d’HbA1c n’évoluait pas significativement (p > 0,05). Les complications diabétiques (rétinopathie, néphropathie et neuropathie) n’influençaient pas significativement l’appartenance au groupe (BC ou MC) ; p > 0,05.
Le traitement par PA permet d’améliorer durablement l’équilibre glycémique des patients DT1, avec une diminution significative de l’HbA1c de 0,7 % en moyenne à 7 ans, voire même de 0,9 % pour les patients dits « bons contrôles ». Cette amélioration semble avoir des répercutions bénéfiques sur la qualité de vie, puisque cette dernière était elle aussi améliorée. La catégorie socioprofessionnelle des patients ne semble pas influencer l’évolution de l’équilibre glycémique sous PA. Une chute d’HbA1C à 1 an d’au moins 0,3 % semble prédictive de l’évolution ultérieure sous traitement puisque le groupe « bon contrôle » maintenait toujours une HbA1c plus faible à 7 ans, ce qui n’était pas le cas pour le groupe « mauvais contrôle ». Par conséquent des études complémentaires sont nécessaires pour identifier les raisons susceptibles d’expliquer cette évolution plus favorable (autonomisation des patients grâce à l’éducation reçue…).
[Show abstract][Hide abstract] ABSTRACT: ObjectifsLes objectifs étaient: 1) d’examiner la validité des valeurs de perception de l’effort (RPE) à prédire la consommation pic
d’oxygène (.VO2pic) des patients obèses et diabétiques durant une épreuve d’effort sousmaximale, et 2) de comparer la précision des prédictions
obtenues à partir des RPE ≤ 15 et RPE ≤ 17.
Matériels et méthodesDix-sept patientes obèses et diabétiques de type 2 réalisaient une épreuve d’effort maximale, durant laquelle les consommations
d’oxygène (.VO2) et les RPE étaient mesurées. Les régressions linéaires individuelles entre.VO2 et RPE étaient extrapolées à RPE = 20 afin de prédire.VO2pic.
RésultatsLes.VO2pic mesurées (12,7 ± 3,6 ml.kg−1.min−1) n’étaient pas significativement différentes des.V O2pic estimées par les RPE ≤ 15 et RPE ≤ 17 (13,1 ± 3,7 et 13,3 ± 3,8 ml.kg−1.min−1, respectivement). Les.V O2pic mesurées étaient corrélées aux.VO2pic estimées par les RPE ≤ 15 et les RPE ≤ 17 (r = 0,89 et r = 0,92, respectivement). Les limites d’agrément étaient de −0,4
± 3,4 et −0,6 ± 3,0 ml.kg−1.min−1 pour les prédictions à partir des RPE ≤ 15 et RPE ≤ 17, respectivement.
ConclusionCes résultats suggèrent que les RPE ≤ 15 fournissent une prédiction précise de la.VO2pic des patientes obèses et diabétiques. Cependant, la précision des prédictions était améliorée lorsque les.VO2pic étaient prédites par les RPE ≤ 17. En conséquence, les RPE peuvent être utilisées pour prédire la.VO2pic, et ainsi diminuer le risque de complications cardiovasculaires durant une épreuve d’effort.
ObjectivesThe main objectives of this study were: 1) to assess the validity of predicting peak oxygen uptake (.VO2peak) from ratings of perceived exertion (RPE) during a sub-maximal graded exercise test (GXT), in obese patients with diabetes,
and 2) to compare the accuracy of predictions obtained from RPE ≤ 15 and RPE ≤ 17. Materials and methods: Seventeen obese
women with type 2 diabetes performed GXT to volitional exhaustion, in which oxygen uptake (.VO2) and RPE were measured. Individual linear regressions between.VO2 and RPE, that were collected during the first stages of GXT (RPE ≤ 15 and RPE ≤ 17), were extrapolated to RPE = 20 in order
to predict.VO2peak. Results: Actual (12.7 ± 3.6 ml.min−1.kg−1) and predicted.VO2peak from RPE ≤ 15 and RPE ≤ 17 (13.1 ± 3.7 and 13.3 ± 3.8 ml.min−1.kg−1, respectively) were not significantly different. The actual.V O2peak were significantly correlated to the predicted.VO2peak from RPE ≤ 15 and RPE ≤ 17 (R = 0.89 and R = 0.92, respectively). The 95% limits of agreement analysis were −0.4 ± 3.4
and −0.6 ± 3.0 ml.min−1.kg−1 for the predictions from RPE ≤ 15 and RPE ≤ 17, respectively.
ConclusionResults suggested that the RPE ≤ 15 provide accurate.V O2peak prediction in obese women with type 2 diabetes. However, the accurate of predictions was improved when the.VO2peak was predicted from RPE ≤ 17. Consequently, RPE may be used to predict.VO2peak and to decrease the risk of cardio-vascular complications during GXT.
Mots clésPerception de l’effort (RPE)–Prédiction–Capacité aérobie maximale–Exercice incrémenté–Réhabilitation à l’effort
KeywordsRatings of perceived exertion (RPE)–Prediction–Maximal aerobic capacity–Graded exercise test–Rehabilitation
[Show abstract][Hide abstract] ABSTRACT: The purpose was to determine the levels of precision in the prediction of middle-distance performances in running using the modeling of the distance-time relationship and a nomogram. Official French running rankings for the men's 3,000; 5,000; and 10,000 m were scrutinized from 1996 to 2007. Only runners who competed over the 3 distances within the same year were included (n = 100). The distance-time relationship was modeled using a linear 2-parameter model from the plot of 2 performances to predict a third one. The nomogram of Mercier was also used to predict 1 performance from the use of the other 2. Actual and predicted performances were significantly different, except for the 5,000- and 10,000-m performances predicted from the nomogram (p > 0.05). Effect sizes (ESs) were lower when the performance was predicted by the nomogram (-0.25 < ES < 0.05) compared with the linear 2-parameter model (-0.99 < ES < 0.47). The predicted performances were significantly correlated to the actual performances (r > 0.46; p < 0.01). The bias ± limits of agreement for the 3,000-; 5,000-; and 10,000-m performances were 1.0 ± 12.8, -0.1 ± 6.9, and 0.1 ± 20.8% and 3.7 ± 15.5, -1.4 ± 6.2, and 2.5 ± 10.6% for prediction from the nomogram and distance-time relationship, respectively. Although the modeling of the distance-time relationship does not enable middle-running performances to be accurately predicted, the precision in the predictions from the nomogram suggests that the nomogram may be used to prescribe adapted training intensities and determine the optimal strategy during the race.
The Journal of Strength and Conditioning Research 11/2010; 24(11):2920-6. · 1.80 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The purpose of this study was to develop a simple, convenient and indirect method for predicting peak oxygen uptake (VO2peak) from a sub-maximal graded exercise test (GXT), in obese women. Thirty obese women performed GXT to volitional exhaustion. During GXT, oxygen uptake and the power at RPE 15 (VO2peak) were measured, and VO2peak was determined. Following assessment of the relationships between VO2peak and PRPE 15, age, height and mass were made available in a stepwise multiple regression analysis with VO2peak as the dependent variable. The equation to predict VO2peak was: (1 min-1) = 1.355 - 9.920e-3 x age + 8.497e-3 x PRPE 15 (r = 0.83; SEE = 0.156 l min(-1)). This study suggests that age and PRPE 15 elicited during a sub-maximal GXT provides a reasonably accurate prediction of VO2peak in obese women.