Fitts S S, Guthrie M R
Department of Rehabilitation Medicine, University of Washington, Seattle 98195.
Am J Phys Med Rehabil. 1995 Jan-Feb;74(1):54-8. doi: 10.1097/00002060-199501000-00009.
The ability to exercise among 20 people with chronic renal failure was assessed on three tests by measuring the distance walked in 6 min, heart rate change from pre-exercise to postexercise and perceived exertion. Test 1 was conducted to minimize practice effects. Ten participants received exercise coaching for 3 mo between Tests 2 and 3, and 10 individuals were in a control group. Distance walked was highly correlated on the three tests; heart rate change and perceived exertion were only slightly less consistent. Three people changed their perceived exertion by more than one point between Tests 2 and 3, and these changes obscured differences between the exercise and control groups. Exclusion of data for those who changed by more than one point equalized perceived exertion changes in the two groups and revealed a significant (P < 0.05) increase in distance in the exercise group (+21.8 m) but not in the control group (+1.5 m). The study demonstrates that, although perceived exertion ratings are intended for use in incremental exercise testing, they are also valuable for assessing consistency v change in the effort of individual participants in single-intensity testing, such as a self-paced walk.
通过测量20名慢性肾衰竭患者在三项测试中的运动能力，包括6分钟内行走的距离、运动前到运动后的心率变化以及主观用力程度。进行测试1以尽量减少练习效应。10名参与者在测试2和测试3之间接受了3个月的运动指导，另外10人作为对照组。三项测试中行走的距离高度相关；心率变化和主观用力程度的一致性稍差。有三人在测试2和测试3之间主观用力程度的变化超过1分，这些变化掩盖了运动组和对照组之间的差异。排除变化超过1分者的数据后，两组的主观用力程度变化趋于均衡，结果显示运动组的行走距离显著增加（P < 0.05）（增加21.8米），而对照组仅增加1.5米。该研究表明，尽管主观用力程度评级旨在用于递增运动测试，但它们对于评估个体参与者在单强度测试（如自由步速行走）中的努力程度的一致性与变化也很有价值。
