Task-dependent neuromuscular adaptations in low back pain: A controlled experimental study

Ducas, J., Marineau, E. et Abboud, J. (2024). Task-dependent neuromuscular adaptations in low back pain: A controlled experimental study. Frontiers in Human Neuroscience, 18 . ISSN 1662-5161 DOI 10.3389/fnhum.2024.1459711

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Résumé

Abstract

Introduction
This study investigated the variability in lumbar neuromuscular adaptations to pain, the task dependency of pain adaptations and the effect of these adaptations on motor performance.

Methods
Twenty-four healthy participants performed isometric back extension contractions at 45° and 90° trunk flexion under pain-free and experimental low back pain conditions induced by electrical stimulation. High-density surface electromyography recorded lumbar muscle activation strategies, and force steadiness was measured using a load cell.

Results
While considerable variability in neuromuscular adaptations to lumbar pain was observed among participants, consistent patterns were found between tasks. In the 90° trunk flexion position, both sides exhibited greater magnitudes of pain adaptations for muscle activity redistribution in the mediolateral axis (p<0.05, 86% increase) and muscle activity amplitude (p<0.001, 183% increase) compared to the 45° trunk flexion position. A significant negative correlation was found between the magnitude of the mediolateral spatial redistribution of muscle activity and force steadiness on the left side (p = 0.045).

Discussion
These findings highlight the intricate and task-dependent nature of neuromuscular adaptations to pain within lumbar muscles, and points toward a potential trade-off between pain adaptations and performance.

Type de document:	Article
Mots-clés libres:	High-density EMG Lumbar Pain Variability Task dependency Experimental pain
Date de dépôt:	13 févr. 2025 14:37
Dernière modification:	13 févr. 2025 14:37
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/11639

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