The VO2 slow component for severe exercise depends on type of exercise and is not correlated with time to fatigue |
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Authors: | Billat, Veronique L. Richard, Ruddy Binsse, Valerie M. Koralsztein, Jean P. Haouzi, Philippe |
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Abstract: | The purpose ofthis study was to examine the influence of the type of exercise(running vs. cycling) on the O2uptake (O2) slow component.Ten triathletes performed exhaustive exercise on a treadmill and on acycloergometer at a work rate corresponding to 90% of maximalO2 (90% work rate maximalO2). The duration of thetests before exhaustion was superimposable for both type of exercises(10 min 37 s ± 4 min 11 s vs. 10 min 54 s ± 4 min 47 s forrunning and cycling, respectively). TheO2 slow component (difference between O2 atthe last minute and minute 3 ofexercise) was significantly lower during running compared with cycling(20.9 ± 2 vs. 268.8 ± 24 ml/min). Consequently, there was norelationship between the magnitude of theO2 slow component and thetime to fatigue. Finally, because blood lactate levels at the end of the tests were similar for both running (7.2 ± 1.9 mmol/l) and cycling (7.3 ± 2.4 mmol/l), there was a clear dissociation between blood lactate and the O2slow component during running. These data demonstrate that1) theO2 slow component dependson the type of exercise in a group of triathletes and2) the time to fatigue isindependent of the magnitude of theO2 slow component and bloodlactate concentration. It is speculated that the difference in muscularcontraction regimen between running and cycling could account for thedifference in theO2 slow component. |
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