Sinacore D R, Jacobson R B, Delitto A
Irene Walter Johnson Rehabilitation Research Institute, Washington University School of Medicine, St Louis, MO 63110.
Phys Ther. 1994 Oct;74(10):930-9; discussion 939-42. doi: 10.1093/ptj/74.10.930.
Electrical stimulation has been used to assess skeletal muscle resistance to fatigue. The purpose of this study was to test the hypothesis that 12 weeks of intense endurance exercise training on a bicycle ergometer would reduce the percentage of decline in quadriceps femoris muscle torque during an electrically elicited fatigue test.
Eleven nondisabled subjects performed 12 weeks of high-intensity endurance exercise training, and 6 subjects served as controls and did not exercise. Two electrically elicited fatigue tests, one with and one without prior voluntary fatiguing exercise, were administered to each subject before and after the 12-week training period.
The percentage of decline in peak torque of the quadriceps femoris muscle over 50 electrically elicited muscle contractions did not change as a result of endurance exercise training, despite significant improvements in maximal oxygen consumption and quadriceps femoris muscle endurance. The recovery of maximal isometric torque immediately after exhausting voluntary exercise followed by electrical stimulation was significantly greater after 12 weeks of intense exercise training.
The percentage of decline in peak torque during an electrically elicited fatigue test does not detect improvements in quadriceps femoris muscle endurance induced by endurance exercise training. The percentage of initial torque recovered immediately after fatiguing exercise, however, is improved by endurance training. [Sinacore Dr, Jacobson RB, Delitto A. Quadriceps femoris muscle resistance to fatigue using an electrically elicited fatigue test following intense endurance exercise training.
电刺激已被用于评估骨骼肌的抗疲劳能力。本研究的目的是验证以下假设：在自行车测力计上进行12周的高强度耐力运动训练，将减少在电诱发疲劳试验期间股四头肌扭矩下降的百分比。
11名无残疾受试者进行了12周的高强度耐力运动训练，6名受试者作为对照组，不进行运动。在为期12周的训练期前后，对每位受试者进行了两次电诱发疲劳试验，一次在有先前自愿疲劳运动的情况下进行，一次在没有先前自愿疲劳运动的情况下进行。
尽管最大耗氧量和股四头肌耐力有显著改善，但经过耐力运动训练后，在50次电诱发肌肉收缩过程中股四头肌峰值扭矩下降的百分比并未改变。在进行12周的高强度运动训练后，在自愿运动耗尽后紧接着进行电刺激，最大等长扭矩的恢复明显更大。
在电诱发疲劳试验期间峰值扭矩下降的百分比并不能检测到耐力运动训练所诱导的股四头肌耐力的改善。然而，耐力训练可提高疲劳运动后立即恢复的初始扭矩百分比。[西纳科尔博士，雅各布森RB，德利托A。在高强度耐力运动训练后使用电诱发疲劳试验评估股四头肌的抗疲劳能力。
