Sport and Exercise Physiology Research Team, Liverpool Hope University, Liverpool, UK.
Eur J Appl Physiol. 2011 Nov;111(11):2775-84. doi: 10.1007/s00421-011-1901-8. Epub 2011 Mar 16.
Previous studies have demonstrated faster pulmonary oxygen uptake (VO2) kinetics in the trained state during the transition to and from moderate-intensity exercise in adults. Whilst a similar effect of training status has previously been observed during the on-transition in adolescents, whether this is also observed during recovery from exercise is presently unknown. The aim of the present study was therefore to examine VO2 kinetics in trained and untrained male adolescents during recovery from moderate-intensity exercise. 15 trained (15 ± 0.8 years, VO2max 54.9 ± 6.4 mL kg(-1) min(-1)) and 8 untrained (15 ± 0.5 years, VO2max 44.0 ± 4.6 mL kg(-1) min(-1)) male adolescents performed two 6-min exercise off-transitions to 10 W from a preceding "baseline" of exercise at a workload equivalent to 80% lactate threshold; VO2 (breath-by-breath) and muscle deoxyhaemoglobin (near-infrared spectroscopy) were measured continuously. The time constant of the fundamental phase of VO2 off-kinetics was not different between trained and untrained (trained 27.8 ± 5.9 s vs. untrained 28.9 ± 7.6 s, P = 0.71). However, the time constant (trained 17.0 ± 7.5 s vs. untrained 32 ± 11 s, P < 0.01) and mean response time (trained 24.2 ± 9.2 s vs. untrained 34 ± 13 s, P = 0.05) of muscle deoxyhaemoglobin off-kinetics was faster in the trained subjects compared to the untrained subjects. VO2 kinetics was unaffected by training status; the faster muscle deoxyhaemoglobin kinetics in the trained subjects thus indicates slower blood flow kinetics during recovery from exercise compared to the untrained subjects.
先前的研究已经证明，成年人在从中等到高强度运动的过渡过程中，训练状态下的肺部氧气摄取（VO2）动力学更快。虽然先前在青少年的过渡期间已经观察到了训练状态的类似影响，但目前尚不清楚这种情况是否也发生在运动恢复期间。因此，本研究的目的是检查训练有素和未训练的男性青少年在从中等到高强度运动恢复期间的 VO2 动力学。15 名训练有素的（15 ± 0.8 岁，VO2max 54.9 ± 6.4 mL kg（-1）min（-1））和 8 名未训练的（15 ± 0.5 岁，VO2max 44.0 ± 4.6 mL kg（-1）min（-1））男性青少年在先前的“基线”运动以 80%乳酸阈的工作量进行了两次 6 分钟的运动过渡，从 10 W 开始；VO2（逐口气）和肌肉脱氧血红蛋白（近红外光谱）连续测量。VO2 脱动力学基本阶段的时间常数在训练和未训练之间没有差异（训练 27.8 ± 5.9 s 与未训练 28.9 ± 7.6 s，P = 0.71）。然而，脱氧血红蛋白脱动力学的时间常数（训练 17.0 ± 7.5 s 与未训练 32 ± 11 s，P < 0.01）和平均响应时间（训练 24.2 ± 9.2 s 与未训练 34 ± 13 s，P = 0.05）在训练组中更快。VO2 动力学不受训练状态的影响；与未训练组相比，训练组中肌肉脱氧血红蛋白动力学更快，表明运动恢复期间血流动力学更慢。
