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Title: Reliability of quadriceps surface electromyography measurements is improved by two vs. single site recordings
Authors: Balshaw, Thomas G.
Fry, A.
Maden-Wilkinson, Thomas M.
Kong, Pui W.
Folland, Jonathan P.
Keywords: Voluntary muscle contraction
Peripheral nerve stimulation
Knee extension
Coefficient of variation
Intraclass correlation coefficient
Evoked muscle response
Issue Date: 2017
Publisher: Springer / © The Authors
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.
Abstract: 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.
Description: 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/
Sponsor: The study was financially supported by the Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis (Grant reference 20194).
Version: Published
DOI: 10.1007/s00421-017-3595-z
URI: https://dspace.lboro.ac.uk/2134/25098
Publisher Link: http://dx.doi.org/10.1007/s00421-017-3595-z
ISSN: 1439-6319
Appears in Collections:Published Articles (Sport, Exercise and Health Sciences)

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