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Sex differences in variances of multi-channel surface electromyography distribution of the vastus lateralis muscle during isometric knee extension in young adults

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Abstract

Purpose

The aim of the present study was to compare spatial electromyographic potential distribution during force production between healthy young female and male using multi-channel surface electromyography (multi-SEMG).

Methods

Thirty healthy subjects (15 females) performed sustained isometric knee extension at 10% maximal voluntary contraction (MVC) task for 120 s. Multi-SEMG signals from the vastus lateralis muscle were detected and the modified entropy, coefficient of variation (CV), and correlation coefficient determined.

Results

The modified entropy and CV showed significant interaction and difference between females and males at all time points during the 10% MVC task. The correlation coefficient in females was significantly lower at 90 and 120 s than that of males.

Conclusions

The multi-SEMG potential distribution pattern in females showed more varied motor unit recruitment during sustained low-intensity isometric contraction than that of males. Variations in motor unit recruitment may result from recruitment and/or de-recruitment of motor units.

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Abbreviations

ANOVA:

Analysis of variance

ARV:

Average rectified value

CV:

Coefficient of variation

EMG:

Electromyogram

multi-SEMG:

Multi-channel surface electromyography

MVC:

Maximal voluntary contraction

VL:

Vastus lateralis

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Acknowledgements

The authors would like to thank all the subjects who volunteered to participate in this study. This study was supported in part by research grants from JSPS KAKENHI (Grant Numbers 24500586 and 15K01369).

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Correspondence to Yuichi Nishikawa.

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The authors declare no conflict of interest and that no companies or manufacturers will benefit from the results of this study.

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Communicated by Toshio Moritani.

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Nishikawa, Y., Watanabe, K., Takahashi, T. et al. Sex differences in variances of multi-channel surface electromyography distribution of the vastus lateralis muscle during isometric knee extension in young adults. Eur J Appl Physiol 117, 583–589 (2017). https://doi.org/10.1007/s00421-017-3559-3

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  • DOI: https://doi.org/10.1007/s00421-017-3559-3

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