REDUCING MUSCLE FATIGUE IN FES APPLICATIONS BY STIMULATING WITH N-LET PULSE TRAINS
REDUCING MUSCLE FATIGUE IN FES APPLICATIONS BY STIMULATING WITH N-LET PULSE TRAINS
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DOI：
10.1109/10.398642
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发表时间：
1995-08-01
影响因子：
4.6
通讯作者：
BARZILAI, AM
中科院分区：
文献类型：
--
作者：
KARU, ZZ;DURFEE, WK;BARZILAI, AM
电刺激用于恢复功能性运动，如站立、步态和抓握，一直受到刺激肌肉快速疲劳的阻碍。本文描述了用N-let(一组N个紧密间隔的刺激脉冲)作为一种产生具有改善疲劳特性的收缩的方法来进行刺激的实验研究。采用表面刺激股四头肌产生等长膝关节扭矩的方法，对27名健康受试者和4名脊髓损伤受试者进行了实验。基于有关肌肉疲劳的文献证据，对N=1-6的N-let序列的参数进行了优化，以产生最大的每个脉冲的力。结果表明：1)在N-let表面刺激的受试者中出现抽动反应的非线性求和；2)对于大多数受试者来说，脉冲间隔约为5ms的双重刺激(N=2)产生了最大的每脉冲扭矩-时间积分；3)平均而言，与传统的单刺激相比，最佳的N-let刺激导致等长扭矩跟踪增加36%。这一结果对缓解功能性电刺激过程中的过早疲劳问题具有直接的意义。
Applications of electrical stimulation for restoration of functional movements such as standing, gait, and grasp have always been hindered by the rapid fatigue of stimulated muscle. This paper describes an experimental investigation of stimulation with N-lets (a set of N closely spaced stimulation pulses) as a means of producing contractions with improved fatigue characteristics. Experiments were conducted on 27 able-bodied and four SCI human subjects using surface stimulation of the quadriceps muscle to produce isometric knee joint torque. Based upon evidence from the literature on muscle fatigue, parameters of the N-let trains for N = 1-6 were optimized to produce the most force per pulse. The results demonstrated that: 1) nonlinear summation of the twitch response occurs in human subjects with N-let surface stimulation; 2) for most subjects, doublet stimulation (N = 2) with a pulse interval of about 5 ms produced the maximum torque-time integral per pulse of the resulting twitch; and 3) on average, optimal N-let stimulation resulted in a 36% increase in isometric torque tracking when compared to traditional singlet stimulation. The results have immediate implications for alleviating the problem of premature fatigue during functional electrical stimulation.