Fornusek C, Gwinn T H, Heard R
Exercise Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia.
Discipline of Behavioural and Social Sciences in Health, Faculty of Health Sciences, University of Sydney, Sydney, Australia.
Spinal Cord. 2014 Aug;52(8):635-9. doi: 10.1038/sc.2014.85. Epub 2014 Jun 3.
Prospective experimental.
To compare the cardiorespiratory responses with electrical stimulation (ES) producing either dynamic leg cycling or intermittent isometric leg contractions using the same ES protocol.
Sydney, Australia.
Eight paraplegics (T4-T11) performed ES exercise sessions on two separate days. On day 1, cardiorespiratory responses were measured during 5 min of rest followed by 35 min of cycling, and finally 15 min of intermittent isometric exercise using the same ES parameters. On the second day, after 5 min of rest, 35 min of isometric exercise was performed followed by 15 min of cycling.
There were no significant differences during the first 35 min of exercise on each day comparing the two modes of exercise for average rate of oxygen consumption (cycling, 534±128 ml min(-1); isometric 558±146 ml min(-1); P=0.451), the average heart rate (cycling, 93±15 b.p.m.; isometric 95±17 b.p.m.; P=0.264) or minute ventilation (cycling, 23.0±6.5 l min(-1); isometric 23.8±6.7 l min(-1); P=0.655). In addition, there were no significant differences between exercise modes for any peak cardiorespiratory values recorded during the initial 35 min of exercise or the following 15 min crossover exercise phase.
The current data found that intermittent ES leg isometric exercise elicited a similar cardiorespiratory response compared with functional ES leg cycling, suggesting it should be investigated as a viable alternative intervention for increasing whole body metabolic rate during sustained exercise training sessions for individuals with paralyzed muscles.
前瞻性实验。
使用相同的电刺激方案，比较电刺激（ES）产生动态腿部蹬车或间歇性等长腿部收缩时的心肺反应。
澳大利亚悉尼。
八名截瘫患者（胸4 - 胸11）在两个不同的日子进行电刺激锻炼。第一天，在5分钟休息后测量心肺反应，随后进行35分钟的蹬车运动，最后使用相同的电刺激参数进行15分钟的间歇性等长运动。第二天，休息5分钟后，先进行35分钟的等长运动，然后进行15分钟的蹬车运动。
在每天锻炼的前35分钟，比较两种运动模式下的平均耗氧率（蹬车，534±128毫升·分钟⁻¹；等长运动，558±146毫升·分钟⁻¹；P = 0.451）、平均心率（蹬车，93±15次/分钟；等长运动，95±17次/分钟；P = 0.264）或分钟通气量（蹬车，23.0±6.5升·分钟⁻¹；等长运动，23.8±6.7升·分钟⁻¹；P = 0.655），均无显著差异。此外，在锻炼的最初35分钟或随后的15分钟交叉运动阶段记录的任何心肺峰值数值，两种运动模式之间也无显著差异。
目前的数据发现，间歇性电刺激腿部等长运动与功能性电刺激腿部蹬车相比，引发了相似的心肺反应，这表明对于肌肉麻痹的个体，在持续运动训练期间，间歇性电刺激腿部等长运动作为一种可行的替代干预措施，用于提高全身代谢率，值得进一步研究。
