Verstappen F T, Veldhuizen J W, Twellaar M, Drost M R, Kuipers H
Department of Movement Sciences, University of Maastricht, The Netherlands.
Int J Sports Med. 1998 Oct;19(7):485-9. doi: 10.1055/s-2007-971949.
A stepwise increasing exercise protocol to measure the maximal aerobic power output of the quadriceps muscle is proposed for use in rehabilitation medicine. Sixteen healthy volunteers performed isokinetic knee extension/flexion exercises at an angular velocity of 180 degrees x s(-1). The protocol consisted of stages of 200 knee movements from 100 flexion to full extension, starting at 10% peak torque (PT) and increasing by 10% PT each following stage until exhaustion. Quadriceps work, oxygen uptake, heart rate, plasma lactate concentration and surface electromyography were monitored. Quadriceps power output (Pext) was highly related (r = 0.95) to the extension torque at which the subjects were instructed to exercise. The test-retest (r = 0.82) and left to right (r = 0.94) correlations of maximum quadriceps power output (Pmax) were high. Both sexes (males 43+/-9W, females 36+/-8W) achieved their Pmax at 47% PT. At submaximal power output stages oxygen uptake (r = 0.85) and EMG-amplitude (r = 0.88) were linearly related to Pext. Mechanical efficiency (optimum at 60% Pmax) showed a large variation between power output stages and between subjects. The relationship between relative oxygen uptake and heart rate or plasma lactate concentration was similar to that of whole body exercise, e.g. running. We conclude that the proposed test is reliable for assessing the maximal aerobic power output of the quadriceps muscle. This parameter of the muscle function may add useful information for assessing the rehabilitation process after knee immobilization.
本文提出了一种用于康复医学的逐步递增运动方案，以测量股四头肌的最大有氧功率输出。16名健康志愿者以180度×秒⁻¹的角速度进行等速膝关节伸展/屈曲运动。该方案包括从100度屈曲到完全伸展的200次膝关节运动阶段，从10%的峰值扭矩（PT）开始，随后每个阶段增加10%的PT，直至力竭。监测股四头肌做功、摄氧量、心率、血浆乳酸浓度和表面肌电图。股四头肌功率输出（Pext）与受试者被指示进行运动时的伸展扭矩高度相关（r = 0.95）。最大股四头肌功率输出（Pmax）的重测相关性（r = 0.82）和左右相关性（r = 0.94）都很高。两性（男性43±9W，女性36±8W）在47%的PT时达到其Pmax。在次最大功率输出阶段，摄氧量（r = 0.85）和肌电图振幅（r = 0.88）与Pext呈线性相关。机械效率（在60% Pmax时最佳）在功率输出阶段之间和受试者之间表现出很大差异。相对摄氧量与心率或血浆乳酸浓度之间的关系与全身运动（如跑步）相似。我们得出结论，所提出的测试对于评估股四头肌的最大有氧功率输出是可靠的。肌肉功能的这一参数可能为评估膝关节固定后的康复过程增加有用信息。
