Effect of damaging exercise on electromechanical delay

Lacourpaille, Lilian, Nordez, Antoine, Doguet, Valentin, Hug, François and Guilhem, Gaël (2016) Effect of damaging exercise on electromechanical delay. Muscle and Nerve, 54 1: 136-141. doi:10.1002/mus.25024

Author Lacourpaille, Lilian
Nordez, Antoine
Doguet, Valentin
Hug, François
Guilhem, Gaël
Title Effect of damaging exercise on electromechanical delay
Journal name Muscle and Nerve   Check publisher's open access policy
ISSN 1097-4598
Publication date 2016-07
Sub-type Article (original research)
DOI 10.1002/mus.25024
Open Access Status Not Open Access
Volume 54
Issue 1
Start page 136
End page 141
Total pages 6
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2017
Language eng
Formatted abstract
Introduction: In this study we aimed to quantify the effect of exercise-induced muscle damage on both the electrochemical and mechanical components of electromechanical delay using very-high-frame-rate ultrasound. Methods: Fifteen participants underwent electrically evoked contractions of the medial gastrocnemius muscle with an ultrasound transducer on the muscle belly and on the myotendinous junction, before, 1 hour, and 48 hours after eccentric exercise of the plantar flexor muscles. Results: Maximal isometric plantar flexor torque was significantly lower at 1 hour (–41.1 ± 14.9%; P = 0.0001) and 48 hours (–11.9 ± 14.9%; P = 0.038) post-exercise compared with pre-exercise. However, the delay between electrical stimulation and the onset of muscle activation, the delay between electrical stimulation and myotendinous junction motion, and the electromechanical delay were not altered significantly by eccentric exercise (P = 0.063). Conclusions: These findings suggest that moderate muscle damage does not affect the time for the electrochemical or mechanical components of electromechanical delay.
Keyword Eccentric contraction
Excitation-contraction coupling
High-frame-rate ultrasound
Muscle damage
Muscle force transmission
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Health and Rehabilitation Sciences Publications
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