Examination of oxygen uptake kinetics in decremental load exercise by a nemerical computation model

概要

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The purpose of this study was to establish a numerical computation model for estimation of oxygen uptake (VO^^・_2) kinetics in decremental load exercise (DLE) starting from a work rate (WR) above the ventilatory threshold (>VT). In the model, WR in DLE were separated into several steps (constant load exercise, CLE) of which the durations increased step by step. VO^^・_2 kinetics in each step was estimated using an exponential equation, and the sum of VO^^・_2 values from all steps at a given time was regarded as simulated VO^^・_2 in DLE. In the model, the time constants were set symmetrically in a step <VT and asymmetrically in a step >VT at onset and offset (τ_<off>) of exercise. As a result, simulated VO^^・_2 qualitatively, but not quantitatively, approximated measured VO^^・_2. Consequently, we incorporated a new model in which a step >VT was subdivided into several parts. Although there was a slight difference quantitatively, the interval of subdivision of 3.0min and τ_<off> of 2.8min allowed for qualitative approximation. The numerical computation model adopted in this study is useful for estimation of VO^^・_2 kinetics during DLE starting from high intensity (>VT).
日本生理人類学会の論文