Williams C A, Carter H, Jones A M, Doust J H
University of Brighton, Chelsea School Research Centre, Eastbourne BN20 7SP, United Kingdom.
J Appl Physiol (1985). 2001 May;90(5):1700-6. doi: 10.1152/jappl.2001.90.5.1700.
The purpose of this study was to compare the kinetics of the oxygen uptake (VO(2)) response of boys to men during treadmill running using a three-phase exponential modeling procedure. Eight boys (11-12 yr) and eight men (21-36 yr) completed an incremental treadmill test to determine lactate threshold (LT) and maximum VO(2). Subsequently, the subjects exercised for 6 min at two different running speeds corresponding to 80% of VO(2) at LT (moderate exercise) and 50% of the difference between VO(2) at LT and maximum VO(2) (heavy exercise). For moderate exercise, the time constant for the primary response was not significantly different between boys [10.2 +/- 1.0 (SE) s] and men (14.7 +/- 2.8 s). The gain of the primary response was significantly greater in boys than men (239.1 +/- 7.5 vs. 167.7 +/- 5.4 ml. kg(-1). km(-1); P < 0.05). For heavy exercise, the VO(2) on-kinetics were significantly faster in boys than men (primary response time constant = 14.9 +/- 1.1 vs. 19.0 +/- 1.6 s; P < 0.05), and the primary gain was significantly greater in boys than men (209.8 +/- 4.3 vs. 167.2 +/- 4.6 ml. kg(-1). km(-1); P < 0.05). The amplitude of the VO(2) slow component was significantly smaller in boys than men (19 +/- 19 vs. 289 +/- 40 ml/min; P < 0.05). The VO(2) responses at the onset of moderate and heavy treadmill exercise are different between boys and men, with a tendency for boys to have faster on-kinetics and a greater initial increase in VO(2) for a given increase in running speed.
本研究的目的是使用三相指数建模程序，比较男孩和男性在跑步机跑步过程中摄氧量（VO₂）反应的动力学。八名男孩（11 - 12岁）和八名男性（21 - 36岁）完成了递增式跑步机测试，以确定乳酸阈值（LT）和最大VO₂。随后，受试者以两种不同的跑步速度运动6分钟，这两种速度分别对应于LT时VO₂的80%（中等强度运动）和LT时VO₂与最大VO₂差值的50%（高强度运动）。对于中等强度运动，男孩[10.2±1.0（SE）秒]和男性（14.7±2.8秒）的主要反应时间常数无显著差异。男孩的主要反应增益显著高于男性（239.1±7.5 vs. 167.7±5.4 ml·kg⁻¹·km⁻¹；P < 0.05）。对于高强度运动，男孩的VO₂动力学明显快于男性（主要反应时间常数 = 14.9±1.1 vs. 19.0±1.6秒；P < 0.05），且男孩的主要增益显著高于男性（209.8±4.3 vs. 167.2±4.6 ml·kg⁻¹·km⁻¹；P < 0.05）。男孩的VO₂慢成分幅度显著小于男性（19±19 vs. 289±40 ml/分钟；P < 0.05）。男孩和男性在中等强度和高强度跑步机运动开始时的VO₂反应不同，在给定的跑步速度增加时，男孩倾向于具有更快的动力学和更大的VO₂初始增加量。
