Evetovich T K, Housh T J, Johnson G O, Evans S A, Stout J R, Bull A J, Smith D B, Evetovich M M
Human Performance Laboratory, University of Nebraska-Lincoln 68588-0229, USA.
Ergonomics. 1996 Feb;39(2):314-21. doi: 10.1080/00140139608964461.
The purpose of this study was twofold: (1) to determine the effect of increasing the duration of the workbout at each power output during the physical working capacity at fatigue threshold (PWCFT) test from 2 to 3 or 4 min, and (2) to examine the time to exhaustion during continuous workbouts at the PWCFT. Twelve adult males (means +/- SD = 22.4 +/- 3.0 years) volunteered to perform three PWCFT tests using workbout durations of 2, 3, and 4 min. Following the determination of the PWCFT values, nine of the subjects performed continuous workbouts at PWCFT2 and PWCFT4 for as long as possible. The mean PWCFT value using 4-min workbouts (PWCFT4 = 168.8 +/- 45.1 W) was significantly less (p < 0.05, 19.1%) than that using 2-min workbouts (PWCFT2 = 208.9 +/- 59.0 W). However, only two subjects were able to complete 60 min at PWCFT4 and none of the subjects were able to complete 60 min at PWCFT2. Therefore, although increasing the duration of the workbout at each power output resulted in a lower PWCFT4, these findings do not support a recommendation for a change in the PWCFT test protocol.
（1）确定在疲劳阈值时的体力工作能力（PWCFT）测试中，将每个功率输出下的运动持续时间从2分钟增加到3分钟或4分钟的效果；（2）检查在PWCFT测试中持续运动至疲劳的时间。12名成年男性（平均年龄±标准差=22.4±3.0岁）自愿参加三项PWCFT测试，运动持续时间分别为2分钟、3分钟和4分钟。在确定PWCFT值后，9名受试者尽可能长时间地在PWCFT2和PWCFT4强度下进行持续运动。使用4分钟运动持续时间的平均PWCFT值（PWCFT4=168.8±45.1瓦）显著低于使用2分钟运动持续时间的平均PWCFT值（PWCFT2=208.9±59.0瓦）（p<0.05，低19.1%）。然而，只有两名受试者能够在PWCFT4强度下完成60分钟运动，没有受试者能够在PWCFT2强度下完成60分钟运动。因此，尽管在每个功率输出下增加运动持续时间会导致PWCFT4降低，但这些结果并不支持对PWCFT测试方案进行更改的建议。
