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首页> 外文期刊>Artificial Organs >Spatially Distributed Sequential Stimulation Reduces Fatigue in Paralyzed Triceps Surae Muscles: A Case Study
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Spatially Distributed Sequential Stimulation Reduces Fatigue in Paralyzed Triceps Surae Muscles: A Case Study

机译：空间分布的顺序刺激减少了瘫痪的肱三头肌腓肠肌的疲劳：一个案例研究

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Functional electrical stimulation (FES) is limited by the rapid onset of muscle fatigue caused by localized nerve excitation repeatedly activating only a subset of motor units. The purpose of this study was to investigate reducing fatigue by sequentially changing, pulse by pulse, the area of stimulation using multiple surface electrodes that cover the same area as one electrode during conventional stimulation. Paralyzed triceps surae muscles of an individual with complete spinal cord injury were stimulated, via the tibial nerve, through four active electrodes using spatially distributed sequential stimulation (SDSS) that was delivered by sending a stimulation pulse to each electrode one after another with 90° phase shift between successive electrodes. For comparison, single electrode stimulation was delivered through one active electrode. For both modes of stimulation, the resultant frequency to the muscle as a whole was 40?Hz. Isometric ankle torque was measured during fatiguing stimulations lasting 2?min. Each mode of stimulation was delivered a total of six times over 12 separate days. Three fatigue measures were used for comparison: fatigue index (final torque normalized to maximum torque), fatigue time (time for torque to drop by 3 dB), and torque-time integral (over the entire trial). The measures were all higher during SDSS (P?
机译：功能性电刺激（FES）受到肌肉疲劳的快速发作的限制，该疲劳是由局部神经刺激仅重复激活一个运动单元的子集引起的。这项研究的目的是研究通过使用多个表面电极逐个脉冲地依次改变刺激面积来减轻疲劳，这些表面电极覆盖了常规刺激过程中与一个电极相同的面积。使用空间分布顺序刺激（SDSS），通过四个活动电极通过胫骨神经刺激完全脊髓损伤的三头肌瘫痪的腓肠肌，方法是通过以90°相接的方式向每个电极一个接一个地发送刺激脉冲在连续电极之间移动。为了比较，单电极刺激通过一个有源电极传递。对于这两种刺激方式，整个肌肉的合成频率为40？Hz。在持续2？min的疲劳刺激过程中测量了等距的踝部扭矩。每种刺激模式在12天内分别进行了六次刺激。比较了三种疲劳测量方法：疲劳指数（归一化为最大扭矩的最终扭矩），疲劳时间（扭矩下降3 dB的时间）和扭矩时间积分（在整个试验过程中）。 SDSS期间的所有措施均较高（P <0.001），分别提高了234％，280％和171％。结果是解决肌肉疲劳的令人鼓舞的第一步，这是FES面临的最大问题之一。

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