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Muscle Activity Adaptations to Spinal Tissue Creep in the Presence of Muscle Fatigue

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Abboud, Jacques et Nougarou, François et Descarreaux, Martin (2016). Muscle Activity Adaptations to Spinal Tissue Creep in the Presence of Muscle Fatigue. PLoS ONE, 11 (2). e0149076. ISSN 1932-6203 DOI 10.1371/journal.pone.0149076

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Résumé

Aim The aim of this study was to identify adaptations in muscle activity distribution to spinal tissue creep in presence of muscle fatigue. Methods Twenty-three healthy participants performed a fatigue task before and after 30 minutes of passive spinal tissue deformation in flexion. Right and left erector spinae activity was recorded using large-arrays surface electromyography (EMG). To characterize muscle activity distribution, dispersion was used. During the fatigue task, EMG amplitude root mean square (RMS), median frequency and dispersion in x- and y-axis were compared before and after spinal creep. Results Important fatigue-related changes in EMG median frequency were observed during muscle fatigue. Median frequency values showed a significant main creep effect, with lower median frequency values on the left side under the creep condition (p[less than or equal to]0.0001). A significant main creep effect on RMS values was also observed as RMS values were higher after creep deformation on the right side (p = 0.014) a similar tendency, although not significant, was observed on the left side (p = 0.06). A significant creep effects for x-axis dispersion values was observed, with higher dispersion values following the deformation protocol on the left side (p[less than or equal to]0.001). Regarding y-axis dispersion values, a significant creep x fatigue interaction effect was observed on the left side (p = 0.016) a similar tendency, although not significant, was observed on the right side (p = 0.08). Conclusion Combined muscle fatigue and creep deformation of spinal tissues led to changes in muscle activity amplitude, frequency domain and distribution.

Type de document: Article
Mots-clés libres: Fatigue -- Comparative Analysis
Date de dépôt: 05 avr. 2019 17:43
Dernière modification: 05 avr. 2019 17:43
Version du document déposé: Version officielle de l'éditeur
URI: http://depot-e.uqtr.ca/id/eprint/8616

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