Koppo Katrien, Bouckaert Jacques, Jones Andrew M
Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000 Ghent, Belgium.
Respir Physiol Neurobiol. 2002 Nov 19;133(3):241-50. doi: 10.1016/s1569-9048(02)00184-2.
The purpose of the present study was to examine the oxygen uptake kinetics during heavy arm exercise using appropriate modelling techniques, and to compare the responses to those observed during heavy leg exercise at the same relative intensity. We hypothesised that any differences in the response might be related to differences in muscle fibre composition that are known to exist between the upper and lower body musculature. To test this, ten subjects completed several bouts of constant-load cycling and arm cranking exercise at 90% of the mode specific V(O(2)) peak. There was no difference in plasma [lactate] at the end of arm and leg exercise. The time constant of the fast component response was significantly longer in arm exercise compared to leg exercise (mean+/-S.D., 48+/-12 vs. 21+/-5 sec; P < 0.01), while the fast component gain was significantly greater in arm exercise (12.1+/-1.0 vs. 9.2+/-0.5 ml min(-1) W(-1); P < 0.01). The V(O(2)) slow component emerged later in arm exercise (126+/-27 vs. 95+/-20 sec; P < 0.01) and, in relative terms, increased more per unit time (5.5 vs. 4.4% min(-1); P < 0.01). These differences between arm crank and leg cycle exercise are consistent with a greater and/or earlier recruitment of type II muscle fibres during arm crank exercise.
本研究的目的是使用适当的建模技术来检测重度手臂运动期间的摄氧动力学，并将这些反应与相同相对强度下重度腿部运动期间观察到的反应进行比较。我们假设反应中的任何差异可能与已知存在于上身和下身肌肉组织之间的肌纤维组成差异有关。为了验证这一点，十名受试者在特定模式下的最大摄氧量（V(O₂)）峰值的90%完成了几轮恒定负荷的骑行和手臂曲柄运动。手臂和腿部运动结束时血浆[乳酸]没有差异。与腿部运动相比，手臂运动中快速成分反应的时间常数明显更长（平均值±标准差，48±12秒对21±5秒；P<0.01），而手臂运动中快速成分增益明显更大（12.1±1.0对9.2±0.5毫升·分钟⁻¹·瓦⁻¹；P<0.01）。手臂运动中V(O₂)慢成分出现得更晚（126±27秒对95±20秒；P<0.01），并且相对而言，单位时间内增加更多（5.5对4.4%·分钟⁻¹；P<0.01）。手臂曲柄运动和腿部骑行运动之间的这些差异与手臂曲柄运动期间II型肌纤维更大程度和/或更早的募集是一致的。
