The Experts below are selected from a list of 4440 Experts worldwide ranked by ideXlab platform
Patrick Pelayo - One of the best experts on this subject based on the ideXlab platform.
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Maximal lactate steady state, Respiratory Compensation threshold and critical power
European Journal of Applied Physiology, 2003Co-Authors: Jeanne Dekerle, Bertrand Baron, Ludovic Dupont, Jacques Vanvelcenaher, Patrick PelayoAbstract:Critical power (CP) and the second ventilatory threshold (VT2) are presumed to indicate the power corresponding to maximal lactate steady state (MLSS). The aim of this study was to investigate the use of CP and VT2 as indicators of MLSS. Eleven male trained subjects [mean (SD) age 23 (2.9) years] performed an incremental test (25 W·min−1) to determine maximal oxygen uptake (VO2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT1 and VT2) associated with break points in minute ventilation (VE), carbon dioxide production (VCO2), VE/VCO2 and VE/VO2 relationships. Exhaustion tests at 90%, 95%, 100% and 110% of VO2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and VO2max values were 344 (29) W and 53.4 (3.7) ml·min−1·kg−1, respectively. CP [278 (22) W; 85.4 (4.8)% VO2max] and VT2 power output [286 (28) W; 85.3 (5.6)% VO2max] were not significantly different (p=0.96) but were higher (p
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maximal lactate steady state Respiratory Compensation threshold and critical power
European Journal of Applied Physiology, 2003Co-Authors: Jeanne Dekerle, Bertrand Baron, Ludovic Dupont, Jacques Vanvelcenaher, Patrick PelayoAbstract:Critical power (CP) and the second ventilatory threshold (VT2) are presumed to indicate the power corresponding to maximal lactate steady state (MLSS). The aim of this study was to investigate the use of CP and VT2 as indicators of MLSS. Eleven male trained subjects [mean (SD) age 23 (2.9) years] performed an incremental test (25 W·min−1) to determine maximal oxygen uptake (VO2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT1 and VT2) associated with break points in minute ventilation (VE), carbon dioxide production (VCO2), VE/VCO2 and VE/VO2 relationships. Exhaustion tests at 90%, 95%, 100% and 110% of VO2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and VO2max values were 344 (29) W and 53.4 (3.7) ml·min−1·kg−1, respectively. CP [278 (22) W; 85.4 (4.8)% VO2max] and VT2 power output [286 (28) W; 85.3 (5.6)% VO2max] were not significantly different (p=0.96) but were higher (p<0.05) than the MLSS work rate [239 (21) W; 74.3 (4.0)% VO2max] and VT1 power output [159 (23) W; 52.9 (6.9)% VO2max]. MLSS work rate was significantly correlated (p<0.05) with those noted at VT1 and VT2 (r=0.74 and r=0.93, respectively). VT2 overestimated MLSS by 10.9 (6.3)% VO2max which was significantly higher than VT1 [+21.4 (5.6)% VO2max; p<0.01]. CP calculated from a given range of exhaustion times does not correspond to MLSS.
Gle O Johnso - One of the best experts on this subject based on the ideXlab platform.
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the relationships among critical power determined from a 3 min all out test Respiratory Compensation point gas exchange threshold and ventilatory threshold
Research Quarterly for Exercise and Sport, 2013Co-Authors: Haley C Ergstrom, Terry J Housh, Jorge M Zuniga, Daniel A Traylo, Clayto L Camic, Robe W Lewis, Richard J Schmid, Gle O JohnsoAbstract:Purpose: Critical power (CP) from the 3-min test was compared to the power outputs associated with thresholds determined from gas exchange parameters that have been used to demarcate the exercise-intensity domains including the Respiratory Compensation point (RCP), gas exchange threshold (GET), and ventilatory threshold (VT). Method: Twenty-eight participants performed an incremental-cycle ergometer test to exhaustion. The VT was determined from the relationship between the ventilatory equivalent for oxygen uptake (V˙E/V˙O2) versus V˙O2 and the GET was determined using the V-slope method (V˙CO2 vs. V˙O2). The RCP was identified from the V˙E-versus-V˙CO2 relationship. CP was the average power output during the last 30 s of the 3-min all-out test. Linear regression was used to determine the power outputs associated with the RCP, GET, and VT, as well as the V˙O2 associated with CP. Mean differences among the associated power outputs, percent V˙O2 peak, and percent peak power output for the GET, VT, RCP, and ...
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estimated times to exhaustion and power outputs at the gas exchange threshold physical working capacity at the rating of perceived exertion threshold and Respiratory Compensation point
Applied Physiology Nutrition and Metabolism, 2012Co-Authors: Haley C Ergstrom, Terry J Housh, Jorge M Zuniga, Daniel A Traylo, Clayto L Camic, Richard J Schmid, Gle O JohnsoAbstract:The purposes of this study were to compare the power outputs and estimated times to exhaustion (Tlim) at the gas exchange threshold (GET), physical working capacity at the rating of perceived exertion threshold (PWCRPE), and Respiratory Compensation point (RCP). Three male and 5 female subjects (mean ± SD: age, 22.4 ± 2.8 years) performed an incremental test to exhaustion on an electronically braked cycle ergometer to determine peak oxygen consumption rate, GET, and RCP. The PWCRPE was determined from ratings of perceived exertion data recorded during 3 continuous workbouts to exhaustion. The estimated Tlim values for each subject at GET, PWCRPE, and RCP were determined from power curve analyses (Tlim =a x b ). The results indicated that the PWCRPE (176 ± 55 W) was not significantly different from RCP (181 ± 54 W); however, GET (155 ± 42 W) was significantly less than PWCRPE and RCP. The estimated Tlim for the GET (26.1 ± 9.8 min) was significantly greater than PWCRPE (14.6 ± 5.6 min) and RCP (11.2 ± 3.1 min). The PWCRPE occurred at a mean power output that was 13.5% greater than the GET and, therefore, it is likely that the perception of effort is not driven by the same mechanism that underlies the GET (i.e., lactate buffering). Furthermore, the PWCRPE and RCP were not signifi- cantly different and, therefore, these thresholds may be associated with the same mechanisms of fatigue, such as increased
Jeanne Dekerle - One of the best experts on this subject based on the ideXlab platform.
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Maximal lactate steady state, Respiratory Compensation threshold and critical power
European Journal of Applied Physiology, 2003Co-Authors: Jeanne Dekerle, Bertrand Baron, Ludovic Dupont, Jacques Vanvelcenaher, Patrick PelayoAbstract:Critical power (CP) and the second ventilatory threshold (VT2) are presumed to indicate the power corresponding to maximal lactate steady state (MLSS). The aim of this study was to investigate the use of CP and VT2 as indicators of MLSS. Eleven male trained subjects [mean (SD) age 23 (2.9) years] performed an incremental test (25 W·min−1) to determine maximal oxygen uptake (VO2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT1 and VT2) associated with break points in minute ventilation (VE), carbon dioxide production (VCO2), VE/VCO2 and VE/VO2 relationships. Exhaustion tests at 90%, 95%, 100% and 110% of VO2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and VO2max values were 344 (29) W and 53.4 (3.7) ml·min−1·kg−1, respectively. CP [278 (22) W; 85.4 (4.8)% VO2max] and VT2 power output [286 (28) W; 85.3 (5.6)% VO2max] were not significantly different (p=0.96) but were higher (p
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maximal lactate steady state Respiratory Compensation threshold and critical power
European Journal of Applied Physiology, 2003Co-Authors: Jeanne Dekerle, Bertrand Baron, Ludovic Dupont, Jacques Vanvelcenaher, Patrick PelayoAbstract:Critical power (CP) and the second ventilatory threshold (VT2) are presumed to indicate the power corresponding to maximal lactate steady state (MLSS). The aim of this study was to investigate the use of CP and VT2 as indicators of MLSS. Eleven male trained subjects [mean (SD) age 23 (2.9) years] performed an incremental test (25 W·min−1) to determine maximal oxygen uptake (VO2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT1 and VT2) associated with break points in minute ventilation (VE), carbon dioxide production (VCO2), VE/VCO2 and VE/VO2 relationships. Exhaustion tests at 90%, 95%, 100% and 110% of VO2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and VO2max values were 344 (29) W and 53.4 (3.7) ml·min−1·kg−1, respectively. CP [278 (22) W; 85.4 (4.8)% VO2max] and VT2 power output [286 (28) W; 85.3 (5.6)% VO2max] were not significantly different (p=0.96) but were higher (p<0.05) than the MLSS work rate [239 (21) W; 74.3 (4.0)% VO2max] and VT1 power output [159 (23) W; 52.9 (6.9)% VO2max]. MLSS work rate was significantly correlated (p<0.05) with those noted at VT1 and VT2 (r=0.74 and r=0.93, respectively). VT2 overestimated MLSS by 10.9 (6.3)% VO2max which was significantly higher than VT1 [+21.4 (5.6)% VO2max; p<0.01]. CP calculated from a given range of exhaustion times does not correspond to MLSS.
Haley C Ergstrom - One of the best experts on this subject based on the ideXlab platform.
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the relationships among critical power determined from a 3 min all out test Respiratory Compensation point gas exchange threshold and ventilatory threshold
Research Quarterly for Exercise and Sport, 2013Co-Authors: Haley C Ergstrom, Terry J Housh, Jorge M Zuniga, Daniel A Traylo, Clayto L Camic, Robe W Lewis, Richard J Schmid, Gle O JohnsoAbstract:Purpose: Critical power (CP) from the 3-min test was compared to the power outputs associated with thresholds determined from gas exchange parameters that have been used to demarcate the exercise-intensity domains including the Respiratory Compensation point (RCP), gas exchange threshold (GET), and ventilatory threshold (VT). Method: Twenty-eight participants performed an incremental-cycle ergometer test to exhaustion. The VT was determined from the relationship between the ventilatory equivalent for oxygen uptake (V˙E/V˙O2) versus V˙O2 and the GET was determined using the V-slope method (V˙CO2 vs. V˙O2). The RCP was identified from the V˙E-versus-V˙CO2 relationship. CP was the average power output during the last 30 s of the 3-min all-out test. Linear regression was used to determine the power outputs associated with the RCP, GET, and VT, as well as the V˙O2 associated with CP. Mean differences among the associated power outputs, percent V˙O2 peak, and percent peak power output for the GET, VT, RCP, and ...
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estimated times to exhaustion and power outputs at the gas exchange threshold physical working capacity at the rating of perceived exertion threshold and Respiratory Compensation point
Applied Physiology Nutrition and Metabolism, 2012Co-Authors: Haley C Ergstrom, Terry J Housh, Jorge M Zuniga, Daniel A Traylo, Clayto L Camic, Richard J Schmid, Gle O JohnsoAbstract:The purposes of this study were to compare the power outputs and estimated times to exhaustion (Tlim) at the gas exchange threshold (GET), physical working capacity at the rating of perceived exertion threshold (PWCRPE), and Respiratory Compensation point (RCP). Three male and 5 female subjects (mean ± SD: age, 22.4 ± 2.8 years) performed an incremental test to exhaustion on an electronically braked cycle ergometer to determine peak oxygen consumption rate, GET, and RCP. The PWCRPE was determined from ratings of perceived exertion data recorded during 3 continuous workbouts to exhaustion. The estimated Tlim values for each subject at GET, PWCRPE, and RCP were determined from power curve analyses (Tlim =a x b ). The results indicated that the PWCRPE (176 ± 55 W) was not significantly different from RCP (181 ± 54 W); however, GET (155 ± 42 W) was significantly less than PWCRPE and RCP. The estimated Tlim for the GET (26.1 ± 9.8 min) was significantly greater than PWCRPE (14.6 ± 5.6 min) and RCP (11.2 ± 3.1 min). The PWCRPE occurred at a mean power output that was 13.5% greater than the GET and, therefore, it is likely that the perception of effort is not driven by the same mechanism that underlies the GET (i.e., lactate buffering). Furthermore, the PWCRPE and RCP were not signifi- cantly different and, therefore, these thresholds may be associated with the same mechanisms of fatigue, such as increased
James G Hopker - One of the best experts on this subject based on the ideXlab platform.
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laboratory predictors of uphill cycling performance in trained cyclists
Journal of Sports Sciences, 2017Co-Authors: Arthur Henrique Bossi, Pedro Lima, Jorge Perrout De Lima, James G HopkerAbstract:ABSTRACTThis study aimed to assess the relationship between an uphill time-trial (TT) performance and both aerobic and anaerobic parameters obtained from laboratory tests. Fifteen cyclists performed a Wingate anaerobic test, a graded exercise test (GXT) and a field-based 20-min TT with 2.7% mean gradient. After a 5-week non-supervised training period, 10 of them performed a second TT for analysis of pacing reproducibility. Stepwise multiple regressions demonstrated that 91% of TT mean power output variation (W kg−1) could be explained by peak oxygen uptake (ml kg−1.min−1) and the Respiratory Compensation point (W kg−1), with standardised beta coefficients of 0.64 and 0.39, respectively. The agreement between mean power output and power at Respiratory Compensation point showed a bias ± random error of 16.2 ± 51.8 W or 5.7 ± 19.7%. One-way repeated-measures analysis of variance revealed a significant effect of the time interval (123.1 ± 8.7; 97.8 ± 1.2 and 94.0 ± 7.2% of mean power output, for epochs 0–2, 2...
