Spectral profile of superficial cervical muscles
Spectral profile of superficial cervical muscles
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DOI：
10.1016/s1050-6411(01)00007-4
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发表时间：
2001-08-01
影响因子：
2.5
通讯作者：
Amell, T
中科院分区：
文献类型：
--
作者：
Kumar, S;Narayan, Y;Amell, T
本研究的目的是确定逐步和线性增加的等长颈屈和伸时胸乳肌、头夹肌和阔肌的中位频率（MF）和平均功率频率（MPF）。有一个缺乏数据的光谱参数的颈部肌肉。这些数据来自40名年轻成年受试者（21名男性和19名女性）。受试者直立坐在单独调整的椅子上，并用4点Velcro约束系统稳定躯干。这些受试者以随机顺序在仪器化阻力装置（专门为研究设计）上以逐渐和线性增加的方式施加等长屈肌和伸肌力，视觉反馈在5 s内达到其最大自主收缩（MVC）。表面肌电图采样从胸锁乳突肌，头夹肌和双侧阔肌在1 kHz。肌电信号进行快速傅立叶变换（FFT）分析。绘制了所有肌肉在频率、功率和收缩等级维度上的光谱曲线。分析了平均中频（MF）、平均功率频率（MPF）、峰值功率和总功率。在胸锁乳突肌和夹肌中，MF随收缩等级的增加而增加，在更高等级时其带宽变宽。随着收缩程度的增加，椭圆曲线保持较窄的带宽，其MF值下降。(C)2001爱思唯尔科技有限公司版权所有。
The objective of the study was to determine the median frequency (MF) and mean power frequency (MPF) of the stermodeidomastorial, splenius capitis and trapezius in progressively and linearly increasing isometric cervical flexion and extension. There is a dearth of data on spectral parameters of cervical muscles. Such data have been generated from 40 young adult subjects (21 male and 19 female). The subjects were seated upright in an individually adjusted chair and stabilized with a 4-point Velcro restraint system to stabilize the torso. These subjects exerted isometric flexor and extensor forces in a random sequence on an instrumented resistance device (specifically designed for the study) in a gradual and linearly increasing manner with a visual feedback to their maximal voluntary contraction (MVC) within a 5 s period. Surface EMG was sampled from the sternocleidomastoid, the splenius capitis and the trapezius muscles bilaterally at 1 kHz. The EMG signals were subjected to Fast Fourier Transform (FFT) analysis. Spectral profiles of all muscles in the dimensions of frequency, power, and grade of contraction were plotted. The mean median frequency (MF), mean power frequency (MPF), peak power and total power were analyzed. In the sternocleidomastoid, and the splenius the MF increased with the grade of contraction, widening its bandwidth at higher grades. The trapezius maintained a narrow bandwidth and its MF declined with the grade of contraction. (C) 2001 Elsevier Science Ltd. All rights reserved.