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Effects of Rate of Decrease in Power Output in Decrement-Load Exercise on Oxygen Uptake

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Title: Effects of Rate of Decrease in Power Output in Decrement-Load Exercise on Oxygen Uptake
Authors: YANO, T. Browse this author
YUNOKI, T. Browse this author
MATSUURA, R. Browse this author
ARIMITSU, T. Browse this author
KIMURA, T. Browse this author
Keywords: Decrement-load exercise
Rate of decrease in power output
Oxygen uptake
Oxygen debt
Issue Date: 2007
Publisher: Institute of Physiology, Czech Academy of Sciences
Journal Title: Physiological Research
Volume: 56
Start Page: 715
End Page: 719
Abstract: The purpose of this study was to examine how oxygen uptake (V.o2) in decrement-load exercise (DLE) is affected by changing rate of decrease in power output. DLE was performed at three different rates of decrease in power output (10,20 and 30 watts・min-1: DLE10, DLE20 and DLE30, respectively) from power output corresponding to 90 % of peak V.o2. V.o2 exponentially increased and then decreased, and the rate of its decrease was reduced at low power output. The values of V.o2 in the three DLE tests were not different for the first 2 min despite the difference in power output. The relationship between V.o2 and power output below 50 watts was obtained as a slope to estimate excessive V.o2 (ex-V.o2) above 50 watts. The slopes were 10.0±0.9 for DLE10, 9.9±0.7 for DLE20 and 10.2±1.0 ml・min-1・watt-1 for DLE30. The difference between V.o2 estimated from the slope and measured V.o2 was defined as ex-V.o2. The peak value of ex-V.o2 for DLE10 (189±116 ml・min-1) was significantly greater than those for DLE20 and for DLE30 (93±97 and 88±34 ml・min-1). The difference between V.o2 in DLE and that in incremental-load exercise (ILE) below 50 watts (ΔV.o2) was greater in DLE30 and smallest in DLE10. There were significant differences in ΔV.o2 among the three DLE tests. The values of ΔV.o2 at 30 watts were 283±152 for DLE10, 413±136 for DLE20 and 483±187 ml・min-1 for DLE30. Thus, a faster rate of decrease in power output resulted in no change of V.o2 at the onset of DLE, smaller ex-V.o2 and greater ΔV.o2. These results suggest that V.o2 is disposed in parallel in each motor unit released from power output or recruited in DLE.
Type: article
Appears in Collections:教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 矢野 徳郎

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