Yano T, Yunoki T, Matsuura R, Ogata H
Exercise Physiology, Graduate School of Education, Hokkaido University, Kita-ku, Sapporo, Japan.
J Physiol Pharmacol. 2004 Jun;55(2):315-24.
The paper sought to determine the exercise intensity where the slow component of oxygen uptake (Vo(2)) first appears in decremental work load exercise (DLE). Incremental work load exercise (ILE) was performed with an increment rate of 15 watts (W) per minute. In DLE, power outputs were decreased by 15 W per minute, from 120 (DLE(120)), 160 (DLE(160)), 200 (DLE(200)) and 240 (DLE(240)) W, respectively. The slopes of Vo(2) against the power output were obtained in the lower section from 0 to 50 W in all DLEs, and in the upper section from 80 to 120 W in DLE(160) and from 100 to 150 W in DLE(200) and DLE(240). The power output at exhaustion in ILE was 274 +/- 20 W. The power output at the ventilatory threshold (VT) obtained in ILE was 167 +/- 22 W. The initial power output in DLE(160) was near the power output at VT. The slopes obtained in the upper sections were 11.4 +/- 0.9 ml x min(-1) x W(-1)1 in DLE(160), 12.8 +/- 0.8 ml x min(-1) x W(-1) in DLE(200), and 14.8 +/- 1.1 ml x min(-1) x W(-1) in DLE(240). The slope obtained in DLE(120) was 10.9 +/- 0.6 ml x min(-1). There were no differences in slope between the upper and lower sections in DLE(160) but there were significant differences in slopes between the upper and lower sections in DLE(200) and DLE(240). Thus, the slow component, which could be observed as a steeper slope in DLE, began to increase when the initial power output in DLE was near to VT.
该论文旨在确定在递减负荷运动（DLE）中摄氧量（Vo₂）慢成分首次出现时的运动强度。递增负荷运动（ILE）以每分钟15瓦（W）的递增速率进行。在DLE中，功率输出分别以每分钟15 W的速率从120（DLE(120)）、160（DLE(160)）、200（DLE(200)）和240（DLE(240)）W递减。在所有DLE中，在功率输出从0到50 W的较低区间以及在DLE(160)中功率输出从80到120 W的较高区间、DLE(200)和DLE(240)中功率输出从100到150 W的较高区间获取Vo₂相对于功率输出的斜率。ILE中的力竭功率输出为274±20 W。ILE中获得的通气阈（VT）功率输出为167±22 W。DLE(160)中的初始功率输出接近VT时的功率输出。在较高区间获得的斜率在DLE(160)中为11.4±0.9 ml·min⁻¹·W⁻¹，在DLE(200)中为12.8±0.8 ml·min⁻¹·W⁻¹，在DLE(240)中为14.8±1.1 ml·min⁻¹·W⁻¹。DLE(120)中获得的斜率为10.9±0.6 ml·min⁻¹。DLE(160)中较高和较低区间的斜率无差异，但DLE(200)和DLE(240)中较高和较低区间的斜率存在显著差异。因此，在DLE中可表现为更陡斜率的慢成分，当DLE中的初始功率输出接近VT时开始增加。
