Effect of increased muscle temperature on oxygen uptake kinetics during exercise.
Effect of increased muscle temperature on oxygen uptake kinetics during exercise.
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DOI：
10.1152/jappl.1997.83.4.1333
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发表时间：
1997-10
影响因子：
3.3
通讯作者：
S. Koga;T. Shiojiri;Narihiko Kondo;T. Barstow
中科院分区：
文献类型：
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作者：
S. Koga;T. Shiojiri;Narihiko Kondo;T. Barstow
为了测试增加肌肉温度（Tm）是否会改善氧摄取（VO2）动力学，7名男性进行了从休息到中等工作率[低于估计的乳酸阈值（LTest）]和重负荷工作率的过渡（VO2 = L试验和峰值VO2之间的差异的50%）在正常Tm（N）和增加Tm（H）的条件下，通过在运动前穿热水灌注裤产生。四头肌Tm在H中显著更高，但直肠温度在两种条件下相似。有没有显着差异的幅度VO2的快速组成部分或在时间常数的开和关瞬变的中度和重度运动之间的两种条件。在剧烈运动的第3分钟和第6分钟之间，H组的VO2增量略小于N组，但有显著性差异。这些数据表明，运动开始前Tm升高，预计会增加O2输送和卸载到肌肉，对VO2动力学的快指数分量（不变时间常数）没有明显的影响。这些数据进一步表明，Tm升高不会导致剧烈运动期间VO2的缓慢成分。
To test whether increased muscle temperature (Tm) would improve O2 uptake (VO2) kinetics, seven men performed transitions from rest to a moderate work rate [below the estimated lactate threshold (LTest)] and a heavy work rate (VO2 = 50% of the difference between LTest and peak VO2) under conditions of normal Tm (N) and increased Tm (H), produced by wearing hot water-perfused pants before exercise. Quadriceps Tm was significantly higher in H, but rectal temperature was similar for the two conditions. There were no significant differences in the amplitudes of the fast component of VO2 or in the time constants of the on and off transients for moderate and heavy exercise between the two conditions. The increment in VO2 between the 3rd and 6th min of heavy exercise was slightly but significantly smaller for H than for N. These data suggest that elevated Tm before exercise onset, which would have been expected to increase O2 delivery and off-loading to the muscle, had no appreciable effect on the fast exponential component of VO2 kinetics (invariant time constant). These data further suggest that elevated Tm does not contribute to the slow component of VO2 during heavy exercise.