Endurance and fatigue characteristics of the neck flexor and extensor muscles during isometric tests in patients with postural neck pain
Endurance and fatigue characteristics of the neck flexor and extensor muscles during isometric tests in patients with postural neck pain
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DOI：
10.1016/j.math.2010.12.005
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发表时间：
2011-08-01
期刊：
影响因子：
--
通讯作者：
Allison, Garry
中科院分区：
文献类型：
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作者：
Edmondston, Stephen;Bjoernsdottir, Gudny;Allison, Garry
在工作或娱乐活动中颈椎持续的姿势负荷可能会导致颈部疼痛的发展。本研究的目的是比较颈部肌肉耐力和疲劳特性在次最大等长耐力试验中的姿势性颈部疼痛患者，无症状的受试者。13名女性体位性颈痛患者和12名无症状女性对照组受试者完成了颈部屈肌和伸肌的定时次最大肌耐力测试。肌肉疲劳，定义为中位频率肌电图（EMG）的时间依赖性降低，在测试过程中使用表面EMG分析进行检查。颈部疼痛组（165 s）的伸肌测试保持时间中位数低于对照组（228 s），但无显著差异（p = 0.17）。两组之间的屈肌测试保持时间没有差异（颈部疼痛36 s，对照组38 s）（p = 0.96）。颈部疼痛组的特征是颈部屈肌（p = 0.03）和伸肌（p = 0.006）肌肉耐力的变异性更大。对于这两种测试，组内和组间的EMG中位频率降低率差异很大，屈肌或伸肌测试组间无显著差异（p = 0.05-0.82）。与对照组相比，体位性颈痛患者颈部肌肉耐力或加速疲劳没有显著损害。然而，这些肌肉功能指数的较大变异性可能反映了与颈痛疾病相关的肌肉功能的患者特异性变化。(C)2010爱思唯尔有限公司版权所有。
Sustained postural loading of the cervical spine during work or recreational tasks may contribute to the development of neck pain. The aim of this study was to compare neck muscle endurance and fatigue characteristics during sub-maximal isometric endurance tests in patients with postural neck pain, with asymptomatic subjects. Thirteen female patients with postural neck pain and 12 asymptomatic female control subjects completed timed sub-maximal muscle endurance tests for the neck flexor and extensor muscles. Muscle fatigue, defined as the time-dependent decrease in median frequency electromyography (EMG), was examined using surface EMG analysis during the tests. The median extensor test holding time was lower but not significantly different in the neck pain group (165 s) that the control group (228 s) (p = 0.17). There was no difference between groups in the flexor test holding time (neck pain 36 s, controls 38 s) (p = 0.96). The neck pain group was characterised by greater variability in neck flexor (p = 0.03) and extensor (p = 0.006) muscle endurance. For both tests, the rate of decrease in median frequency EMG was highly variable within and between groups with no significant difference between groups for the flexor or extensor test (p = 0.05-0.82). Patients with postural neck pain did not have significant impairment of neck muscle endurance or accelerated fatigue compared to control subjects. However, the greater variability in these indices of muscle function may reflect patient-specific changes in muscle function associated with neck pain disorder. (C) 2010 Elsevier Ltd. All rights reserved.