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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2010

Open Access 01-12-2010 | Research article

Changes in the flexion-relaxation response induced by hip extensor and erector spinae muscle fatigue

Authors: Martin Descarreaux, Danik Lafond, Vincent Cantin

Published in: BMC Musculoskeletal Disorders | Issue 1/2010

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Abstract

Background

The flexion-relaxation phenomenon (FRP) is defined by reduced lumbar erector spinae (ES) muscle myoelectric activity during full trunk flexion. The objectives of this study were to quantify the effect of hip and back extensor muscle fatigue on FRP parameters and lumbopelvic kinematics.

Methods

Twenty-seven healthy adults performed flexion-extension tasks under 4 different experimental conditions: no fatigue/no load, no fatigue/load, fatigue/no load, and fatigue/load. Total flexion angle corresponding to the onset and cessation of myoelectric silence, hip flexion angle, lumbar flexion angle and maximal trunk flexion angle were compared across different experimental conditions by 2 × 2 (Load × Fatigue) repeated-measures ANOVA.

Results

The angle corresponding to the ES onset of myoelectric silence was reduced after the fatigue task, and loading the spine decreased the lumbar contribution to motion compared to the hip during both flexion and extension. A relative increment of lumbar spine motion compared to pelvic motion was also observed in fatigue conditions.

Conclusions

Previous results suggested that ES muscles, in a state of fatigue, are unable to provide sufficient segmental stabilization. The present findings indicate that, changes in lumbar-stabilizing mechanisms in the presence of muscle fatigue seem to be caused by modulation of lumbopelvic kinematics.
Appendix
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Metadata
Title
Changes in the flexion-relaxation response induced by hip extensor and erector spinae muscle fatigue
Authors
Martin Descarreaux
Danik Lafond
Vincent Cantin
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2010
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-11-112

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