Kordi et al_JEK accepted version_Reliability of EMG during PPO cycling.pdf (4.55 MB)

Reliabilty of traditional and task specific reference tasks to assess peak muscle activation during two different sprint cycling tests

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journal contribution
posted on 15.07.2019 by Mehdi Kordi, Jonathan Folland, Stuart Goodall, Paul A. Barratt, Glyn Howatson
© 2019 Elsevier Ltd Neuromuscular activation is considered an important determinant sprint cycling performance but requires reliable EMG amplitude measurements to facilitate sensitive assessments. The reliability of EMG measurements during sprint cycling may depend on the sprint cycling test undertaken (isovelocity or isoinertial accelerating), the reference tasks used for normalisation (isometric MVCs of a series of single muscle groups [ISO-SINGJT] or isometric cycling MVCs [ISO-CYC]), and the efficacy of the normalisation. This study aimed to compare the magnitude and between-session reliability of peak muscle activation (peak rmsEMG) during: isovelocity and isoinerital sprint cycling tests; ISO-SINGJT and ISO-CYC reference tasks; and absolute and normalised EMG during the sprint cycling tests. EMG amplitude was measured over six major muscle groups on both legs and all measurements were made over two sessions in a randomised counterbalanced design. Peak rmsEMG was assessed during both ISO-SINGJT and ISO-CYC MVCs and then during mechanical peak power output (PPO) during isovelocity (120 RPM) and isoinerital acceleration (0 to >150 RPM) sprint tests. Absolute peak rmsEMG and for the sprint tests normalised EMG values were determined, and coefficient of variation and intra-class correlation coefficients used to assess reliability. Peak rmsEMG at PPO during both sprint cycling tests was similar for the six muscle groups measured. Peak rmsEMG was higher during ISO-SINGJT than ISO-CYC for for 3 of the 6 muscle groups, but all muscle groups exhibited similar reliability for both reference tasks. Neither reference task improved the between-session reliability for either sprint test. This data highlights reservations in the use of isometric reference tasks to ascertain changes in peak muscle activation over time in during sprint cycling assessments.



  • Sport, Exercise and Health Sciences

Published in

Journal of Electromyography and Kinesiology




41 - 48


KORDI, M. ... et al., 2019. Reliabilty of traditional and task specific reference tasks to assess peak muscle activation during two different sprint cycling tests. Journal of Electromyography and Kinesiology, 46, pp. 41 - 48.


© Elsevier


AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Electromyography and Kinesiology and the definitive published version is available at https://doi.org/10.1016/j.jelekin.2019.03.008.

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