Relationship Between
Maximal Oxygen Uptake and Oxygenation Level in Inactive Muscle
at Exhaustion in Incremental Exercise in Humans
T. YANO, M. HORIUCHI, T. YUNOKI, R. MATSUURA, H.
OGATA
Laboratory of Exercise Physiology, Graduate School of Education,
Hokkaido University, Sapporo, Japan
Received November 22, 2004
Accepted December 28, 2004
On-line available Februrary 16, 2005
Summary
The aim of the present study was to determine whether the
oxygenation level in an inactive muscle during an incremental
exercise test, determined by near-infrared spectroscopy,
influences the maximal oxygen uptake (Vo2max). The oxygenation
level at the onset of incremental exercise was higher than that
at rest and started to decrease at a high power output. A
minimal level was observed at exhaustion during incremental
exercise. Vo2 increased linearly after some delay, and the rate
of increase in Vo2 was greater at a higher power output. Heart
rate increased linearly after the time delay, and the rate of
increase in heart rate did not change. There was a significant
correlation between Vo2max and oxygenation level in inactive
muscle at exhaustion (r = -0.89). We therefore concluded that
the oxygenation level in inactive muscle at exhaustion during
incremental exercise is associated with an individual difference
in Vo2max.
Key words
Oxygenation • Inactive muscle • Incremental exercise • Maximal
oxygen uptake
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