A METHOD TO EFFECT PHYSIOLOGICAL RECRUITMENT ORDER IN ELECTRICALLY ACTIVATED MUSCLE
A METHOD TO EFFECT PHYSIOLOGICAL RECRUITMENT ORDER IN ELECTRICALLY ACTIVATED MUSCLE
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DOI：
10.1109/10.76384
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发表时间：
1991-02-01
影响因子：
4.6
通讯作者：
MORTIMER, JT
中科院分区：
文献类型：
--
作者：
FANG, ZP;MORTIMER, JT
一种新的刺激方法已被用来实现生理招聘秩序的小到大的运动单位在电激活肌肉。 使用quasitrapezoidal形脉冲和三极袖电极的选择性激活小运动轴突成为可能，从而招募慢收缩，抗疲劳的肌肉单位之前，快收缩，易疲劳的单位在异质性肌肉。 在五只猫中测量了来自内侧腓肠肌的等距收缩力。 生理招聘秩序证明了较大的抽搐宽度在较低的力水平和较小的抽搐宽度在较高的力水平的肌肉测试。 此外，当采用新的刺激方法时，力调制过程更加渐进，并且在较低的刺激频率下获得融合收缩。 此外，通过新方法激活的肌肉在低力水平下重复激活时更具抗疲劳性。 这种刺激方法实施起来更简单，对神经肌肉系统的不良影响比以前的阻断方法更少。 因此，它可能在未来的功能性神经肌肉刺激系统中有应用。
A new stimulation method has been utilized to achieve physiological recruitment order of small-to-large motor units in electrically activated muscles. The use of quasitrapezoidal-shaped pulses and a tripolar cuff electrode made selective activation of small motor axons possible, thus recruiting slow-twitch, fatigue-resistant muscle units before fast-twitch, fatigable units in a heterogeneous muscle. Isometric contraction force from the medial gastrocnemius muscle was measured in five cats. The physiological recruitment order was evidenced by larger twitch widths at lower force levels and smaller twitch widths at higher force levels in the muscles tested. In addition, force modulation process was more gradual and fused contractions were obtained at lower stimulation frequencies when the new stimulation method was employed. Furthermore, muscles activated by the new method were more fatigue-resistant under repetitive activation at low force levels. This stimulation method is simpler to implement and has fewer adverse effects on the neuromuscular system than previous blocking methods. Therefore, it may have applications in future functional neuromuscular stimulation systems.