Division of Applied Biomedical Research, King's College London, London, UK.
Muscle Nerve. 2010 Nov;42(5):756-63. doi: 10.1002/mus.21746.
Electrical stimulation (ES) improves muscle properties after spinal cord injury (SCI), but cycling power output (PO) remains low. We investigated the effect of endurance and strength ES training on these parameters. Assessments of quadriceps strength and fatigue resistance, cycling PO, and muscle biopsies were made in four well-trained SCI subjects (three cyclists and one rower) before and after additional weight training in the cyclists and once in the rower. Weight training improved muscle strength, but cycling PO was low in all subjects. There was no effect of training type on biopsy data. Biopsies showed non-specific signs of pathology, predominance of type IIa fibers, and uniform metabolic activity. Oxidative activity was low, as were capillary:fiber ratios in the cyclists. Cycling PO is limited by factors other than muscle strength. Future ES training studies should attempt to improve muscle oxidative capacity to optimize the potential benefits of ES exercise.
电刺激（ES）可改善脊髓损伤（SCI）后的肌肉特性，但循环功率输出（PO）仍然较低。我们研究了耐力和力量 ES 训练对这些参数的影响。在四名训练有素的 SCI 受试者（三名自行车手和一名赛艇运动员）中，在自行车运动员进行额外的举重训练前后以及在赛艇运动员中进行一次举重训练前后，对股四头肌力量和抗疲劳能力、循环 PO 和肌肉活检进行了评估。举重训练提高了肌肉力量，但所有受试者的循环 PO 均较低。训练类型对活检数据没有影响。活检显示出非特异性的病理学迹象，IIa 型纤维占优势，代谢活性均匀。自行车运动员的氧化活性较低，毛细血管：纤维比也较低。循环 PO 的限制因素不是肌肉力量。未来的 ES 训练研究应尝试提高肌肉的氧化能力，以优化 ES 运动的潜在益处。
