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Reliability of quadriceps surface electromyography measurements is improved by two vs. single site recordings

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journal contribution
posted on 23.05.2017, 13:13 by Tom Balshaw, A. Fry, Thomas M. Maden-Wilkinson, Pui W. Kong, Jonathan Folland
Purpose: The reliability of surface electromyography (sEMG) is typically modest even with rigorous methods, and therefore further improvements in sEMG reliability are desirable. This study compared the between-session reliability (both within participant absolute reliability and between-participant relative reliability) of sEMG amplitude from single vs. average of two distinct recording sites, for individual muscle (IM) and whole quadriceps (WQ) measures during voluntary and evoked contractions. Methods: Healthy males (n = 20) performed unilateral isometric knee extension contractions: voluntary maximum and submaximum (60%), as well as evoked twitch contractions on two separate days. sEMG was recorded from two distinct sites on each superficial quadriceps muscle. Results: Averaging two recording sites vs. using single site measures improved reliability for IM and WQ measurements during voluntary (16–26% reduction in within-participant coefficient of variation, CVW) and evoked contractions (40–56% reduction in CVW). Conclusions: For sEMG measurements from large muscles, averaging the recording of two distinct sites is recommended as it improves within-participant reliability. This improved sensitivity has application to clinical and research measurement of sEMG amplitude.

Funding

The study was financially supported by the Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis (Grant reference 20194).

History

School

  • Sport, Exercise and Health Sciences

Published in

European Journal of Applied Physiology

Pages

1 - 10

Citation

BALSHAW, T.G. ... et al, 2017. Reliability of quadriceps surface electromyography measurements is improved by two vs. single site recordings. European Journal of Applied Physiology, 117 (6), pp. 1085-1094.

Publisher

Springer / © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

23/03/2017

Publication date

2017

Notes

This is an open access article published by Springer and distributed under the terms of the Creative Commons Attribution Licence, http:// creativecommons.org/licenses/by/4.0/

ISSN

1439-6319

Language

en

Licence

Exports