Kang Jie, Chaloupka Edward C, Biren Gregory B, Mastrangelo M Alysia, Hoffman Jay R
Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ 08628, USA.
Eur J Appl Physiol. 2009 Feb;105(3):445-51. doi: 10.1007/s00421-008-0922-4. Epub 2008 Nov 12.
To examine whether the validity of perception-based intensity regulation would be affected by exercise duration, 20 subjects were recruited to complete a maximal exercise test (GXT) and four submaximal trials of varying duration and intensity using a cyle ergometer. During GXT, ratings of perceived exertion (RPE), oxygen uptake VO2, heart rate (HR), and power output (PO) equivalent to 50 and 75% VO2peak were determined. During each trial, subjects were to produce and maintain a workload using RPE estimated at 50 or 75% VO2peak for 20 or 40 min, and VO2, HR, and PO were measured throughout the exercise. No differences in average VO(2) were found between the estimation and production trial of either duration. However, average HR and PO were lower (P < 0.05) during the production trial of both durations. It appears that exercise duration has a minimal impact upon the accuracy of using RPE to regulate a target metabolic demand.
为了研究基于感知的强度调节的有效性是否会受到运动持续时间的影响，招募了20名受试者，使用自行车测力计完成一次最大运动测试（GXT）以及四次不同持续时间和强度的次最大运动试验。在GXT期间，测定主观用力感觉（RPE）、摄氧量VO2、心率（HR）以及相当于50%和75%VO2峰值时的功率输出（PO）。在每次试验期间，受试者要使用估计为50%或75%VO2峰值的RPE产生并维持20或40分钟的工作量，并且在整个运动过程中测量VO2、HR和PO。在两种持续时间的估计试验和产生试验之间，未发现平均VO(2)存在差异。然而，在两种持续时间的产生试验期间，平均HR和PO较低（P<0.05）。看来运动持续时间对使用RPE调节目标代谢需求的准确性影响极小。
