长时间振动对运动单位行为的影响。

The influence of prolonged vibration on motor unit behavior.

作者信息

Mosier Eric M, Herda Trent J, Trevino Michael A, Miller Jonathan D

机构信息

Neuromechanics Laboratory, Department of Health, Sport, and Exercise Sciences, University of Kansas, 1301 Sunnyside Avenue, Lawrence, Kansas, 66045, USA.

出版信息

Muscle Nerve. 2017 Apr;55(4):500-507. doi: 10.1002/mus.25270. Epub 2016 Dec 26.

DOI:10.1002/mus.25270

PMID:27465016

Abstract

INTRODUCTION

The purpose of this study was to determine the effects of vibration (VIB) on motor unit (MU) behavior of the vastus lateralis (VL) muscle during a 40% maximal voluntary contraction (MVC).

METHODS

Eleven healthy (age 21.3 ± 2.6 years) individuals participated in the study. Surface electromyography (EMG) data were recorded from the VL during isometric trapezoidal muscle contractions at 40% MVC. Firing events of single MUs and EMG amplitude were reported for the first, middle, and final seconds of a 12-second steady force segment at 40% MVC. VIB was applied at 55 Hz to the patellar tendon for 15 minutes before and continued throughout the remainder of testing (VIB) or remained off (CON).

RESULTS

There were significant increases in MU firing rates during VIB in comparison to CON and no differences in EMG amplitude between VIB and CON.

CONCLUSION

The VIB-mediated reduction in muscle spindle function altered MU behavior at 40% MVC. Muscle Nerve 55: 500-507, 2017.

摘要

引言

本研究的目的是确定振动（VIB）对股外侧肌（VL）在40%最大自主收缩（MVC）期间运动单位（MU）行为的影响。

方法

11名健康个体（年龄21.3±2.6岁）参与了本研究。在40%MVC的等长梯形肌肉收缩过程中，从VL记录表面肌电图（EMG）数据。报告了在40%MVC的12秒稳定力段的第一秒、中间秒和最后一秒单个运动单位的放电事件和肌电图幅度。在测试前，以55Hz的频率对髌腱施加振动15分钟，并在测试的其余时间持续施加（VIB组），或不施加振动（CON组）。