使用智能手机时颈部持续弯曲导致颈部肌肉疲劳

IF 2.5 2区 工程技术 Q2 ENGINEERING, INDUSTRIAL
Donghyun Song, Dasom Park, Eunjee Kim, Gwanseob Shin
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引用次数: 0

摘要

一项实验室实验评估了长时间坐着使用智能手机时颈部伸肌局部肌肉疲劳的发展情况。20 名年轻成年人在支撑坐姿下进行了 45 分钟的智能手机操作,平均头部倾斜角度为 30.4°-34.6°。在智能手机任务和间歇性次最大等长颈部伸展试验中,对颈椎竖脊肌肌电图(EMG)信号的平均振幅和中值功率频率进行了量化。数据显示,随着时间的推移,平均振幅和中位功率频率分别呈上升和下降趋势。不过,时间效应的统计学意义并不一致。右侧颈部伸肌的中位功率频率在不同试验之间存在显著差异(p <0.05),但并不表明出现了疲劳。研究结果表明,在普通支持性坐姿下使用智能手机 45 分钟,虽然主观评定的颈部不适感明显增加,但并未对颈部浅层伸肌产生明显疲劳。要研究高强度使用智能手机导致颈部不适的机制,需要对被动组织随时间的变化以及颈椎深层肌肉的协同激活进行全面评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Neck muscle fatigue due to sustained neck flexion during smartphone use

A laboratory experiment evaluated local muscle fatigue development in the neck extensor muscles during prolonged smartphone use in sitting. Twenty young adults conducted a smartphone task for 45 min in supported sitting, with the mean head tilt angle of 30.4°–34.6° from neutral upright. The mean amplitude and median power frequency of the electromyography (EMG) signals of the cervical erector spinae muscles were quantified during the smartphone task and in intermittent sub-maximal isometric neck extension trials. Data showed an increasing and decreasing trend of the mean amplitude and the median power frequency over time, respectively. Still, the statistical significance of the time effect was not found consistently. The median power frequency of the right neck extensor muscle differed significantly (p < 0.05) between the trials but did not indicate fatigue development. Study results suggest that smartphone use in common supported sitting for 45 min, although subjective rated neck discomfort increased significantly, did not produce significant fatigue in the superficial neck extensors. Investigation into the mechanism of neck discomfort due to intensive smartphone use would require a comprehensive evaluation of time-dependent changes in the passive tissues and synergistic activation of deeper cervical spine muscles.

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来源期刊
International Journal of Industrial Ergonomics
International Journal of Industrial Ergonomics 工程技术-工程:工业
CiteScore
6.40
自引率
12.90%
发文量
110
审稿时长
56 days
期刊介绍: The journal publishes original contributions that add to our understanding of the role of humans in today systems and the interactions thereof with various system components. The journal typically covers the following areas: industrial and occupational ergonomics, design of systems, tools and equipment, human performance measurement and modeling, human productivity, humans in technologically complex systems, and safety. The focus of the articles includes basic theoretical advances, applications, case studies, new methodologies and procedures; and empirical studies.
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