两种不同模式的神经肌肉电刺激所诱导的抽搐增强：对运动单位募集的影响
Twitch potentiation induced by two different modalities of neuromuscular electrical stimulation: implications for motor unit recruitment.
作者信息
Regina Dias Da Silva Sarah, Neyroud Daria, Maffiuletti Nicola A, Gondin Julien, Place Nicolas
机构信息
School of Physical Education and Sport, University of São Paulo, Ribeirão Preto, Brazil.
出版信息
Muscle Nerve. 2015 Mar;51(3):412-8. doi: 10.1002/mus.24315. Epub 2015 Jan 5.
INTRODUCTION
We tested the hypothesis that twitch potentiation would be greater following conventional (CONV) neuromuscular electrical stimulation (50-µs pulse width and 25-Hz frequency) compared with wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (1-ms, 100-Hz) and voluntary (VOL) contractions, because of specificities in motor unit recruitment (random in CONV vs. random and orderly in WPHF vs. orderly in VOL).
METHODS
A single twitch was evoked by means of tibial nerve stimulation before and 2 s after CONV, WPHF, and VOL conditioning contractions of the plantar flexors (intensity: 10% maximal voluntary contraction; duration: 10 s) in 13 young healthy subjects.
RESULTS
Peak twitch increased (P<0.05) after CONV (+4.5±4.0%) and WPHF (+3.3±5.9%), with no difference between the 2 modalities, whereas no changes were observed after VOL (+0.8±2.6%).
CONCLUSIONS
Our results demonstrate that presumed differences in motor unit recruitment between WPHF and CONV do not seem to influence twitch potentiation results.
引言
我们检验了这样一个假设，即与宽脉冲高频（WPHF）神经肌肉电刺激（1毫秒，100赫兹）和自主（VOL）收缩相比，传统（CONV）神经肌肉电刺激（50微秒脉冲宽度和25赫兹频率）后抽搐增强会更显著，这是由于运动单位募集的特异性（CONV中随机募集，WPHF中随机且有序募集，VOL中有序募集）。
方法
在13名年轻健康受试者中，通过对跖屈肌进行CONV、WPHF和VOL条件性收缩（强度：最大自主收缩的10%；持续时间：10秒）之前及之后2秒，借助胫神经刺激诱发单次抽搐。
结果
CONV（+4.5±4.0%）和WPHF（+3.3±5.9%）后峰值抽搐增加（P<0.05），两种方式之间无差异，而VOL后未观察到变化（+0.8±2.6%）。
结论
我们的结果表明，WPHF和CONV之间运动单位募集的假定差异似乎并不影响抽搐增强结果。
Zotero 插件