Department of Kinesiology, California State University, Fresno, CA, 93740, USA.
Department of Health and Human Performance, College of Innovation and Professional Programs, Concordia University Chicago, Chicago, IL, 60305, USA.
Eur J Appl Physiol. 2019 Sep;119(9):2083-2094. doi: 10.1007/s00421-019-04197-4. Epub 2019 Aug 1.
The mediators of the perception of effort during exercise are still unclear. The aim of the present study was to examine physiological responses during runs using a rating of perceived exertion (RPE)-clamp model at the RPE corresponding to the gas exchange threshold (RPE) and 15% above GET (RPE) to identify potential mediators and performance applications for RPE during treadmill running.
Twenty-one runners ([Formula: see text] = 51.7 ± 8.3 ml kg min) performed a graded exercise test to determine maximal oxygen consumption and the RPE associated with GET and GET + 15% followed by randomized 60 min RPE-clamp runs at RPE and RPE. Mean differences for [Formula: see text], heart rate (HR), minute ventilation ([Formula: see text]), respiratory frequency ([Formula: see text], respiratory exchange ratio (RER), and velocity were compared across each run.
After minute 14, [Formula: see text], RER and velocity did not differ across conditions, but decreased across time (p < 0.05). There was a significant (p < 0.05) condition × time interaction for [Formula: see text], where values were significantly higher during RPE-clamp runs at RPE and decreased across time in both conditions. There were no differences across condition or time for HR, and only small difference between conditions for [Formula: see text].
HR and [Formula: see text] may play a role in mediating the perception of effort, while [Formula: see text], RER, and [Formula: see text] may not. Although HR and [Formula: see text] may mediate the maintenance of a perceptual intensity, they may not be sensitive to differentiate perceptual intensities at GET and GET + 15%. Thus, prescribing exercise using an RPE-clamp model may only reflect a sustainable [Formula: see text] within the moderate intensity domain.
运动中用力感知的中介仍然不清楚。本研究的目的是通过在与呼吸交换阈值（RPE）和 RPE 以上 15%对应的 RPE 下进行的跑步时生理反应（RPE）钳位模型，检查跑步时 RPE 的潜在中介和性能应用，以识别潜在的中介和性能应用。
21 名跑步者（[公式：见文本] = 51.7 ± 8.3ml kg min）进行了分级运动测试，以确定最大摄氧量和与 GET 相关的 RPE 以及 GET + 15%，随后在 RPE 和 RPE 下进行随机的 60 分钟 RPE 钳位运行。比较了每个运行时[公式：见文本]、心率（HR）、分钟通气量([Formula: see text]）、呼吸频率([Formula: see text]）、呼吸交换比（RER）和速度的平均差异。
在第 14 分钟后，[公式：见文本]、RER 和速度在不同条件下没有差异，但随着时间的推移而下降（p < 0.05）。[公式：见文本]的条件 × 时间交互作用有显著差异（p < 0.05），在 RPE 钳位运行时，在 RPE 下的值显著较高，并在两种条件下随时间下降。HR 没有在条件或时间上有差异，而[公式：见文本]在条件之间只有很小的差异。
HR 和[公式：见文本]可能在用力感知中起中介作用，而[公式：见文本]、RER 和[公式：见文本]可能不起作用。尽管 HR 和[公式：见文本]可能介导感知强度的维持，但它们可能无法区分 GET 和 GET + 15%的感知强度。因此，使用 RPE 钳位模型进行运动处方可能只反映了中强度范围内可持续的[公式：见文本]。
