UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Sports Science Institute of South Africa, PO Box 115, Newlands 7725, South Africa.
Br J Sports Med. 2009 Oct;43(10):775-81. doi: 10.1136/bjsm.2008.056036. Epub 2009 Feb 11.
The purpose of this study was to examine ratings of perceived exertion (RPE) and performance during repetitive maximal effort 40 km time trials as well as after an intervention that aimed to decrease certainty about the remaining distance of the exercise bout. In addition, we examined the RPE during exercise bouts of markedly different duration.
Part 1: 12 well-trained, competitive-level cyclists completed five 40 km time trials. During the final time trial all feedback was withheld until the final kilometre. In addition, to cause confusion about the remaining distance, they were asked to report their RPE at random intervals from 18 km to 38 km. Part 2: 6 well-trained, recreation-level cyclists randomly completed a 5 km, 10 km, 40 km and 100 km time trial.
Part 1: Mean RPE increased during the first four trials and decreased during the final trial. The rate of RPE progression increased in linearity during the first four trials and became more conservative in the final trial. These changes were directly related to performance. Part 2: Mean RPE for longer duration trials (40 km, 100 km) were lower during the first half of trial duration but matched those of shorter trials in the final 20%.
Increased familiarity of the exercise bout and certainty about its endpoint are associated with a more aggressive RPE strategy that produces a superior exercise performance. Certainty about the endpoint and the duration of exercise affect both the RPE strategy and performance.
本研究旨在考察重复最大努力 40 公里计时赛过程中的感知用力（RPE）评分和表现，以及旨在降低对运动回合剩余距离确定性的干预后的表现。此外，我们还考察了明显不同持续时间的运动回合中的 RPE。
第 1 部分：12 名训练有素、竞技水平的自行车手完成了 5 次 40 公里计时赛。在最后一次计时赛中，直到最后一公里才提供所有反馈。此外，为了混淆剩余距离，他们被要求在 18 公里到 38 公里之间的随机间隔报告他们的 RPE。第 2 部分：6 名训练有素、休闲水平的自行车手随机完成了 5 公里、10 公里、40 公里和 100 公里计时赛。
第 1 部分：前四次试验中平均 RPE 增加，最后一次试验中 RPE 减少。前四次试验中 RPE 进展率的线性增加变得更加保守，在最后一次试验中。这些变化与表现直接相关。第 2 部分：较长持续时间试验（40 公里、100 公里）的平均 RPE 在试验前半段较低，但在最后 20%与较短试验的 RPE 匹配。
对运动回合的熟悉程度增加和对其终点的确定性与更具侵略性的 RPE 策略有关，该策略可产生更好的运动表现。对终点和运动持续时间的确定性会影响 RPE 策略和表现。
