Effects of activation pattern on nonisometric human skeletal muscle performance
Effects of activation pattern on nonisometric human skeletal muscle performance
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DOI：
10.1152/japplphysiol.00729.2006
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发表时间：
2007-05-01
影响因子：
3.3
通讯作者：
Binder-Macleod, Stuart A.
中科院分区：
文献类型：
--
作者：
Maladen, Ryan D.;Perumal, Ramu;Binder-Macleod, Stuart A.
在意志肌激活过程中，运动单元经常以不同的放电模式放电，包括短暂的高频活动爆发。这些激活率的变化使中枢神经系统能够精确地控制肌肉产生的力量。本研究探讨了在训练中改变刺激脉冲的瞬时频率如何影响非等距肌肉的表现。每个刺激训练产生的峰值偏移被认为是衡量肌肉表现的主要指标。结果表明，在10到50赫兹的测试频率范围内，利用骨骼肌捕获特性的变频列车比恒频列车产生更大的偏移。此外，还确定了可以用比恒频列车更少的脉冲实现目标轨迹的变频列车。这些发现表明，与随意肌激活模式类似，改变脉冲序列内的瞬时频率可用于改善功能性电刺激期间的肌肉表现。
During volitional muscle activation, motor units often fire with varying discharge patterns that include brief, high-frequency bursts of activity. These variations in the activation rate allow the central nervous system to precisely control the forces produced by the muscle. The present study explores how varying the instantaneous frequency of stimulation pulses within a train affects nonisometric muscle performance. The peak excursion produced in response to each stimulation train was considered as the primary measure of muscle performance. The results showed that at each frequency tested between 10 and 50 Hz, variable-frequency trains that took advantage of the catchlike property of skeletal muscle produced greater excursions than constant-frequency trains. In addition, variable-frequency trains that could achieve targeted trajectories with fewer pulses than constant-frequency trains were identified. These findings suggest that similar to voluntary muscle activation patterns, varying the instantaneous frequency within a train of pulses can be used to improve muscle performance during functional electrical stimulation.