呼吸数によるAT推定法の限界に関する研究 : 呼吸と運動リズムとの同期が起こりにくい条件下において

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Under the condition that entrainment between breathing rate and exercise rhythm was minimized. The limitation for deciding anaerobic threshold (AT) by respiratory frequency (f) was studied. Ten healthy subjects (5male and 5female) have volunteered to take part in two incremental cycle exercises (male : 30watt/2min, 50rpm ; female : 20watt/2min, 50rpm). The subjects were either sedentary or active and performed tests under two different conditions. The different conditions are explained below. 1) Condition M : Use a metronome to maintain pedalling frequency so entrainment would easily occur. 2) Condition S : Use a tachometer to maintain pedalling frequency so entrainment would not easily occur. Oxygen uptake (VO_2) at AT were determined by two different methods. The first method was to detect the point of non-linear increase in minute ventilation (VE) and carbon dioxide output (VCO_2) and then to increase detection in the ventilatory equivalent for O_2(VE/VO_2) without increasing the ventilatory equivalent for CO_2(VE/VCO_2) (AT-V). The second method was to detect inflection in f by multisegment linear regression (AT-CF). There were no significant differences between AT-V (condition M : 26.0±6.2, condition S : 26.4±6.0ml/kg/min) and AT-CF (condition M : 31.6±10.2, condition S : 24.7±10.0ml/kg/min). A significant positive correlation between AT-V and AT-CF was observed in condition S (r=0.850, p<0.05), but not in condition M (r=0.563, p<0.05). The error between AT-V and AT-CF had individual variations. An error within±5% was observed in only 4 out of 10 subjects. These results suggested that even though the ability to detect AT using f is superior in condition S, f is an inadequate indicator the AT, though for the exercise entrained breathing is minimized.
日本体力医学会の論文
1994-02-01

呼吸数によるAT推定法の限界に関する研究 : 呼吸と運動リズムとの同期が起こりにくい条件下において

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