Green J Matt, Yang Zhang, Laurent Charles M, Davis Jon-Kyle, Kerr Kelly, Pritchett Robert C, Bishop Phillip A
Department of Kinesiology, The University of Alabama, Tuscaloosa, AL 35487-0312, USA.
Med Sci Sports Exerc. 2007 Nov;39(11):2051-7. doi: 10.1249/mss.0b013e318148bddf.
This study examined effects of heat gain, circulatory adjustment to temperature regulation (HR), and [La] consequent to interval (INT) and constant-load (CON) cycling on session RPE (S-RPE).
Male volunteers (N = 10) completed a cycle ergometer VO2peak test and then, in a randomized, counterbalanced order, four cycling bouts, including constant load (approximately 45% VO2peak) (CON) and interval (8 x 1 min at about 90% VO2peak, 1 min between intervals) (INT), in hot (approximately 32.5 WBGT) (HOT) and cool (approximately 21.0 WBGT) (COOL) environments. Trials included a standardized warm-up and cool-down (10 min each: 0 W, 60 rpm). Total external work was equated among all trials, with blood lactate ([La]), heart rate (HR), rectal temperature (Tre), and acute RPE recorded at 10, 13, 17, 21, 25, and 36 min. S-RPE was recorded 20 min after each session.
HOT (CON and INT) resulted in significantly (P < 0.05) greater heat gain (Tre), HR, and RPE-O, whereas INT had significantly elevated [La] versus CON (HOT and COOL). HOT yielded significantly higher S-RPE versus COOL for CON (HOT = 5.6 +/- 2.1, COOL = 4.3 +/- 1.3) and INT (HOT = 7.0 +/- 1.9, COOL = 5.1 +/- 2.0). S-RPE was significantly higher for INT/HOT than CON/HOT.
Heat gain and cardiac strain (Tre, HR) and [La]) were manipulated with environment and exercise type while holding total work constant. The added strain of HOT was reflected in elevated S-RPE for both CON and INT. S-RPE linkage with [La] was limited to HOT trials, indicating only a loose association. These data indicate that under the conditions of this study, S-RPE is similar to acute RPE in that no single mediator seems universally dominant.
本研究考察了热积累、温度调节的循环调整（心率）以及间歇（INT）和恒定负荷（CON）骑行后血乳酸浓度（[La]）对单次运动主观用力程度（S-RPE）的影响。
男性志愿者（N = 10）完成了一次自行车测力计最大摄氧量（VO2peak）测试，然后以随机、平衡的顺序，在炎热（约32.5湿球黑球温度）（HOT）和凉爽（约21.0湿球黑球温度）（COOL）环境中进行四次骑行，包括恒定负荷（约45%VO2peak）（CON）和间歇（8×1分钟，约90%VO2peak，间歇之间休息1分钟）（INT）。试验包括标准化的热身和放松（各10分钟：0瓦，60转/分钟）。所有试验的总外部功相等，在第10、13、17、21、25和36分钟记录血乳酸（[La]）、心率（HR）、直肠温度（Tre）和急性主观用力程度。每次运动后20分钟记录S-RPE。
炎热环境（CON和INT）导致显著更高（P < 0.05）的热积累（Tre）、心率和主观用力程度评分（RPE-O），而INT的血乳酸浓度（[La]）显著高于CON（炎热和凉爽环境）。对于CON（炎热环境 = 5.6 ± 2.1，凉爽环境 = 4.3 ± 1.3）和INT（炎热环境 = 7.0 ± 1.9，凉爽环境 = 5.1 ± 2.0），炎热环境下的S-RPE显著高于凉爽环境。INT/炎热环境的S-RPE显著高于CON/炎热环境。
在总功恒定的情况下，热积累、心脏负荷（Tre、HR和[La]）受环境和运动类型的影响。炎热环境增加的负荷反映在CON和INT的S-RPE升高上。S-RPE与[La]的关联仅限于炎热环境试验，表明两者关联较弱。这些数据表明，在本研究条件下，S-RPE与急性主观用力程度相似，没有单一的调节因素似乎普遍起主导作用。
