Campbell I G, Williams C, Lakomy H K
Division of Sport, Health and Exercise, Staffordshire University, Stoke on Trent, United Kingdom.
Br J Sports Med. 1997 Mar;31(1):36-40. doi: 10.1136/bjsm.31.1.36.
Wheelchair athletes often select a percentage of their top speed (%TS) to determine training intensity. The aim of the study was to determine whether choosing a %TS corresponds to the physiological concept of relative exercise intensity (% peak oxygen uptake: %VO2 peak) and to examine selected physiological and metabolic responses of a group of wheelchair athletes to 60 minutes' exercise at 80% TS.
12 male wheelchair athletes (10 paraplegics and two tetraplegics) performed a series of tests on a motorised treadmill adapted for wheelchairs. The tests, which were undertaken on separate occasions, included the determination of VO2 peak, the determination of oxygen cost at a range of submaximal wheelchair propulsion speeds, and a 60 min exercise test at 80% TS.
Wheelchair propulsion speeds equivalent to 60%, 70%, 80%, and 90% of each subject's TS were found to equate to 48.3 (SD13.8)%, 60.0(11.1)%, 70.6(9.8)%, and 82.7(9.6)% of VO2 peak, with a wide variation in the relative exercise intensities evident at each %TS. During the 1 h exercise test at 80% TS the physiological and metabolic responses measured were indicative of steady state exercise, with no signs of fatigue evident.
The results of this study suggest that selecting a %TS is not an appropriate way of selecting a common relative exercise intensity. There may also be a need for the current training practises of some wheelchair road racers to be modified.
轮椅运动员常选择其最高速度的一定百分比（%TS）来确定训练强度。本研究的目的是确定选择%TS是否符合相对运动强度的生理学概念（%最大摄氧量：%VO₂峰值），并研究一组轮椅运动员在80%TS下进行60分钟运动后的选定生理和代谢反应。
12名男性轮椅运动员（10名截瘫患者和2名四肢瘫患者）在一台适配轮椅的电动跑步机上进行了一系列测试。这些测试在不同时间进行，包括测定VO₂峰值、在一系列次最大轮椅推进速度下测定氧气消耗，以及在80%TS下进行60分钟的运动测试。
发现相当于每个受试者TS的60%、70%、80%和90%的轮椅推进速度分别相当于VO₂峰值的48.3（标准差13.8）%、60.0（11.1）%、70.6（9.8）%和82.7（9.6）%，在每个%TS下相对运动强度存在明显的广泛差异。在80%TS下进行的1小时运动测试中，所测量的生理和代谢反应表明是稳态运动，没有明显的疲劳迹象。
本研究结果表明，选择%TS不是选择共同相对运动强度的合适方法。一些轮椅公路赛车手目前的训练方法可能也需要改进。
