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

BALSHAW, T G, FRY, A, MADEN-WILKINSON, Tom, KONG, P W and FOLLAND, J P (2017). Reliability of quadriceps surface electromyography measurements is improved by two vs. single site recordings. European journal of applied physiology, 117 (6), 1085-1094.

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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. 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. 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). 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.

Item Type: Article
Additional Information: ** From PubMed via Jisc Publications Router.
Uncontrolled Keywords: Coefficient of variation, Evoked muscle response, Intraclass correlation coefficient, Knee extension, Peripheral nerve stimulation, Voluntary muscle contraction
Research Institute, Centre or Group - Does NOT include content added after October 2018: Centre for Sport and Exercise Science
Identification Number:
Page Range: 1085-1094
SWORD Depositor: Helen Garner
Depositing User: Helen Garner
Date Deposited: 17 May 2017 15:58
Last Modified: 18 Mar 2021 04:20

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