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


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Descarreaux, Martin, Lafond, Danik et Cantin, Vincent (2010). Changes in the flexion-relaxation response induced by hip extensor and erector spinae muscle fatigue. BMC Musculoskeletal Disorders, 11 (1). ISSN 14712474 DOI 10.1186/1471-2474-11-112

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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 x 2 (Load x 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.

Type de document: Article
Mots-clés libres: Internal Medicine Rc31-1245 Medicine Diseases of the Musculoskeletal System Rc925-935 Anatomy & Physiology
Date de dépôt: 05 avr. 2019 18:06
Dernière modification: 05 avr. 2019 18:06
Version du document déposé: Version officielle de l'éditeur

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