Regional flexion relaxation phenomenon in lumbar extensor muscles under delayed-onset muscle soreness: High-density surface electromyography insights

Ducas, J., Pano-Rodriguez, A., Vadez, G. et Abboud, J. (2024). Regional flexion relaxation phenomenon in lumbar extensor muscles under delayed-onset muscle soreness: High-density surface electromyography insights. European Journal of Applied Physiology . ISSN 1439-6327 DOI 10.1007/s00421-024-05678-x

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Résumé

Abstract

Purpose
This study aimed to investigate whether lumbar delayed-onset muscle soreness (DOMS) impacts the magnitude of the flexion relaxation phenomenon regionally.

Methods
Eighteen adult participants (9 men and 9 women) performed flexion extension movement under two conditions (with and without DOMS). Lumbar muscle activation strategies were recorded using high-density surface electromyography (HDsEMG) on both sides of the trunk. To determine the spatial distribution of flexion relaxation phenomenon, flexion relaxation ratio of muscle activity was computed for all electrodes of the HDsEMG grid and the coordinates of the centroid (average position of flexion relaxation ratio across the HDsEMG grid) in the mediolateral and craniocaudal axis were calculated.

Results
The results revealed a cranial shift (~ 6 mm) of flexion relaxation phenomenon within the lumbar extensor muscles when DOMS was present (both sides: p < 0.05), possibly attributed to the increased recruitment of lumbar stabilizing muscles located caudally, which may serve as a guarding mechanism to pain.

Conclusion
These results highlight the importance of evaluating the entire lumbar region when assessing the flexion relaxation phenomenon.

Type de document:	Article
Mots-clés libres:	Delayed-onset muscle soreness Flexion relaxation phenomenon High-density surface electromyography Low back pain Lumbar extensor muscles
Date de dépôt:	13 févr. 2025 14:53
Dernière modification:	13 févr. 2025 14:53
Version du document déposé:	Post-print (version corrigée et acceptée)
URI:	https://depot-e.uqtr.ca/id/eprint/11638

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