Mechanical Engineering Department, University of Delaware, 126 Spencer Laboratory, Newark, Delaware 19711, USA.
Muscle Nerve. 2012 Mar;45(3):393-402. doi: 10.1002/mus.22302.
The cardiorespiratory and muscular strength benefits of functional electrical stimulation (FES) pedaling for spinal cord injury (SCI) subjects are limited because the endurance of electrically stimulated muscle is low.
We tested new electrical stimulation timing patterns (Stim3, designed using a forward dynamic simulation to minimize the muscle stress-time integral) to determine whether SCI subjects could increase work and metabolic responses when pedaling a commercial FES ergometer. Work, rate of oxygen uptake (VO(2)), and blood lactate data were taken from 11 subjects (injury level T4-T12) on repeated trials.
Subjects performed 11% more work pedaling with Stim3 than with existing stimulation patterns (StimErg) (P = 0.043). Average (VO(2)) and blood lactate concentrations were not significantly different between Stim3 (442 ml/min, 5.9 mmol/L) and StimErg (417 ml/min, 5.9 mmol/L).
The increased mechanical work performed with Stim3 supports the use of patterns that minimize the muscle stress-time integral to prolong FES pedaling.
由于电刺激肌肉的耐力较低，功能性电刺激（FES）蹬踏对脊髓损伤（SCI）患者的心肺和肌肉力量益处有限。
我们测试了新的电刺激定时模式（Stim3，使用正向动力学模拟设计，以最小化肌肉应力量-时间积分），以确定 SCI 患者在蹬踏商业 FES 测力计时是否可以增加工作量和代谢反应。在重复试验中，从 11 名（损伤水平 T4-T12）受试者中获得了工作量、耗氧量（VO2）和血乳酸数据。
与现有的刺激模式（StimErg）相比，使用 Stim3 蹬踏可多完成 11%的工作量（P = 0.043）。Stim3（442ml/min，5.9mmol/L）和 StimErg（417ml/min，5.9mmol/L）之间的平均（VO2）和血乳酸浓度没有显著差异。
Stim3 所完成的机械工作量增加支持使用最小化肌肉应力量-时间积分的模式来延长 FES 蹬踏。
