Effects of force load, muscle fatigue and magnetic stimulation on surface electromyography during side arm lateral raise task: a preliminary study with healthy subjects

Cao, Liu and Wang, Ying and Hao, Dongmei and Rong, Yao and Yang, Lin and Zhang, Song and Zheng, Dingchang (2017) Effects of force load, muscle fatigue and magnetic stimulation on surface electromyography during side arm lateral raise task: a preliminary study with healthy subjects. BioMed International Research. ISSN 2314-6141

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Official URL: https://www.hindawi.com/journals/bmri/aip/8943850/

Abstract

The aim of this study was to quantitatively investigate the effects of force load, muscle fatigue and extremely low frequency (ELF) magnetic stimulation on surface electromyography (SEMG) signal features during side arm lateral raise task. SEMG signals were recorded from 18 healthy subjects on the anterior deltoid using a BIOSEMI Active Two system during side lateral raise task (with the right arm 90 degrees away from the body) with three different loads on the forearm (0kg, 1kg and 3 kg; their order was randomized between subjects). The arm maintained the loads until the subject felt exhausted. The first 10s recording for each load was regarded as non-fatigue status and the last 10s before the subject was exhausted as fatigue status. The subject was then given a five-minute resting between different loads. Two days later, the same experiment was repeated on every subject, while this time the ELF magnetic stimulation was applied to the subject’s deltoid muscle during the five-minute rest period. Three commonly used SEMG features, including root mean square (RMS), median frequency (MDF) and sample entropy (SampEn) were analyzed and compared between different loads, non-fatigue/fatigue status, and with/without ELF magnetic stimulation. Variance analysis results showed that the effect of force load on RMS was significant (p<0.001), with increased RMS observed with the increase of force loads, but not for MDF and SampEn (both p>0.05). In comparison with non-fatigue status, for all the different force loads with and without ELF stimulation, RMS was significantly larger at fatigue (all p<0.001) and MDF and SampEn were significantly smaller (all p<0.001). Furthermore, variance analysis showed that force and fatigue had significant interaction on RMS change (p<0.001), but not on MDF and SampEn (p>0.05). Finally, the RMS, MDF, SampEn and their changes with force were not significantly different between with and without ELF stimulation (all p>0.05). Our study comprehensively quantified the effects of force, fatigue and the ELF magnetic stimulation on SEMG features, which may facilitate a better understanding of the underlying physiological mechanisms of muscle activities associated with force and fatigue, and of muscle physiological response to ELF magnetic stimulation.

Item Type: Journal Article
Keywords: Lateral raise task, Extremely low frequency (ELF) magnetic stimulation, Fatigue, Surface electromyography (SEMG)
Faculty: Faculty of Medical Science
Depositing User: Professor D Zheng
Date Deposited: 03 Apr 2017 08:40
Last Modified: 03 Apr 2017 08:41
URI: http://arro.anglia.ac.uk/id/eprint/701623

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