Relationship in Simulation between Oxygen Deficit and Oxygen Uptake in Decrement-load Exercise Starting from Low Exercise Intensity
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概要
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The purpose of the present study was to determine by simulation whether oxygen deficit kinetics in decrement-load exercise (DLE) starting from a low exercise intensity is related to the oxygen uptake (Vo_2) kinetics. In this simulation, work rate in DLE was separated into steps that were regarded as constant-load exercises (CLEs). It was assumed that Vo_2 kinetics behaved exponentially at the onset and offset of each CLE, respectively. Vo_2 at the onset of CLEs increases at the same time and becomes a recovery phase step-by-step corresponding to the decrement of work rate. The sum of Vo_2 values at the onset of CLEs at a given time (nt-Vo_2) corresponds to Vo_2 excluding oxygen debt in DLE. The sum of Vo_2 values at the offset of CLEs at a given time (dt-Vo_2) corresponds to Vo_2 related to oxygen debt in DLE. The total of net-and dt-Vo_2 values is equivalent to Vo_2 actually observed in DLE (gs-Vo_2). As the oxygen requirement level is a steady-state value of Vo_2 in CLE, the oxygen deficit level can be obtained by subtracting Vo_2 at the onset of CLE from the steady-state value. The oxygen deficit level at a given time was added in all CLEs. This is oxygen deficit per unit time (df-Vo_2). Oxygen debt and oxygen deficit were calculated by integrating df-Vo_2 and dt-Vo_2 from the start of exercise to a given time, respectively. Gs-Vo_2 increased, reached a peak, and decreased linearly until the end of the DLE. Oxygen deficit increased rapidly and showed a steady state. Oxygen debt increased linearly after a time lapse. The difference between oxygen deficit and oxygen debt changed like gs-Vo_2 kinetics. Therefore, it is concluded that if we consider the repayment of oxygen debt in the oxygen deficit in DLE, the kinetics of the oxygen deficit becomes similar to gs-Vo_2 kinetics in the simulation.
- 日本生理人類学会の論文
著者
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Yunoki T
Graduate School Of Education Hokkaido University
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Ogata Hisayoshi
Laboratory Of Exercise Physiology Graduate School Of Education Hokkaido University
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Yunoki Takahiro
Graduate School Of Education Hokkaido University
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YANO Tokuo
Exercise Physiology, Graduate School of Education, Hokkaido University
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YUNOKI Takahiro
Exercise Physiology, Graduate School of Education, Hokkaido University
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Ogata Hisayoshi
Exercise Physiology, Graduate School of Education, Hokkaido University
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Ogata H
Laboratory Of Exercise Physiology Graduate School Of Education Hokkaido University
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Yano Tokuo
Exercise Physiology Graduate School Of Education Hokkaido University
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