Journal
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Volume 83, Issue 6, Pages 559-565Publisher
SPRINGER-VERLAG
DOI: 10.1007/s004210000295
Keywords
oxygen uptake kinetics; slow component; prior exercise
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The aim of the study was to examine to what extent prior high- or low-intensity cycling, yielding the same amount of external work, influenced the oxygen uptake ((V) over dot O-2) slow component of subsequent high-intensity cycling. The 12 subjects cycled in two protocols consisting of an initial 3 min period of unloaded cycling followed by two periods of constant-load exercise separated by 3 min of rest and 3 min of unloaded cycling. In protocol 1 both periods of exercise consisted of 6 min cycling at a work rate corresponding to 90% peak oxygen uptake ((V) over dot O-2peak). Protocol 2 differed from protocol 1 in that the first period of exercise consisted of a mean of 12.1 (SD 0.8) min cycling at a work rate corresponding to 50% (V) over dot O-2peak. The difference between the 3rd min (V) over dot O-2 and the end (V) over dot O-2 (Delta (V) over dot O2(6-3)) was used as an index of the (V) over dot O-2 slow component. Prior high-intensity exercise significantly reduced Delta (V) over dot O2(6-3). The Delta (V) over dot O2(6-3) was also reduced by prior low-intensity exercise despite an unchanged plasma lactate concentration at the start of the second period of exercise. The reduction was more pronounced after prior high- than after prior low-intensity exercise (59% and 28%, respectively). The results of this study show that prior exercise of high as well as low intensity reduces the (V) over dot O-2 slow component and indicate that a metabolic acidosis is not a necessary condition to elicit a reduction in Delta (V) over dot O2(6-3).
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