Int J Sports Physiol Perform. 2021 Feb 1;16(2):176-183. doi: 10.1123/ijspp.2020-0065. Epub 2020 Aug 17.
Despite the progress made in the study of subjective measures in resistance training, some questions remain unanswered. Here the authors investigated if ratings of perceived exertion (RPE) can predict task failure and bar velocity across exercises and loads as a primary outcome and whether a battery of subjective measures differ as a function of the lifted loads as a secondary outcome.
In this preregistered study, 20 resistance-trained subjects (50% female) first completed a 1-repetition-maximum test of the barbell squat and bench press. In the second and third sessions, they completed 2 sets of squats followed by 2 sets of bench press to task failure, using 70% or 83% of 1-repetition maximum, while bar velocity was recorded. RPE scores were recorded after every repetition. In addition to RPE, rating of fatigue, affective valence, enjoyment, and load preferences were collected after set and session completion.
Across conditions, RPE was strongly correlated with reaching task failure (r = .86) and moderately correlated with bar velocity (r = -.58). The model indicates that an increase in 1 RPE unit is associated with an 11% shift toward task failure and a 4% reduction in bar velocity, with steeper slopes observed in the heavier condition. Negligible differences were observed between the load conditions in rating of fatigue, affective valence, enjoyment, and load preference.
RPE scores, collected on a repetition-by-repetition basis, accurately reflected reaching task failure across loads and conditions. Hence, RPE can be used to prescribe repetition numbers during ongoing sets. The negligible differences between load conditions in rating of fatigue, affective valence, enjoyment, and load preference indicate that when sets are taken to task failure, loads can be selected based on individual preferences.
尽管在抗阻训练中主观测量的研究已经取得了进展，但仍有一些问题尚未得到解答。在这里，作者研究了在作为主要结果的不同练习和负荷下，感知用力（RPE）评分是否可以预测任务失败和杠速度，以及作为次要结果的一组主观测量是否因所举负荷的不同而有所差异。
在这项预先注册的研究中，20 名有抗阻训练经验的受试者（50%为女性）首先完成了杠铃深蹲和卧推的 1 次重复最大测试。在第二和第三节课中，他们使用 70%或 83%的 1 次重复最大进行 2 组深蹲，然后进行 2 组卧推，直到达到任务失败，同时记录杠速度。每次重复后记录 RPE 得分。除了 RPE，在完成组和课后还收集了疲劳、情感效价、享受和负荷偏好的评分。
在所有条件下，RPE 与达到任务失败高度相关（r =.86），与杠速度中度相关（r = -.58）。该模型表明，RPE 增加 1 个单位与任务失败的转变增加 11%和杠速度降低 4%有关，在较重的条件下观察到更陡峭的斜率。在疲劳、情感效价、享受和负荷偏好的评分中，在不同负荷条件之间观察到几乎没有差异。
在不同负荷和条件下，基于重复的 RPE 评分准确反映了达到任务失败的情况。因此，RPE 可以用于在持续进行的组中规定重复次数。在疲劳、情感效价、享受和负荷偏好的评分中，在不同负荷条件之间几乎没有差异，这表明当组达到任务失败时，可以根据个人偏好选择负荷。
