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Titre : | Muscular activity and torque of the foot dorsiflexor muscles during decremental isometric test : a cross-sectional study |
Type de document : | article de périodique |
Auteurs : | Maria Ruiz-Munoz, Auteur ; [et al.], Auteur |
Année de publication : | 2017 |
Article en page(s) : | p. 16-22 |
Langues : | Anglais (eng) |
Descripteurs (mots clés) : | [Thésaurus Mesh]Cheville [Thésaurus Mesh]Électromyographie [Thésaurus Mesh]Muscles squelettiques [Thésaurus HELB]:Paramédical:Muscle long extenseur de l'hallux [Thésaurus HELB]:Paramédical:Muscle long extenseur des orteils
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Mots-clés : | Ankle Electromyography Force Tibialis anterior Extensor digitorum longus Extensor hallucis longus |
Résumé : | Purpose: To analyse the torque variation level that could be explained by the muscle activation (EMG) amplitude of the three major foot dorsiflexor muscles (tibialis anterior (TA), extensor digitorum longus (EDL), extensor hallucis longus (EHL)) during isometric foot dorsiflexion at different intensities. Methods: In a cross-sectional study, forty-one subjects performed foot dorsiflexion at 100%, 75%, 50% and 25% of maximal voluntary contractions (MVC) with the hip and knee flexed 90◦ and the ankle in neutral position (90◦ between leg and foot). Three foot dorsiflexions were performed for each intensity. Outcome variables were: maximum (100% MVC) and relative torque (75%, 50%, 25% MVC), maximum and relative EMG amplitude. A linear regression analysis was calculated for each intensity of the isometric foot dorsiflexion. Results: The degree oftorque variation (dependent variable)from the independent variables explain (EMG amplitude of the three major foot dorsiflexor muscles) the increases when the foot dorsiflexion intensity is increased, with values of R2 that range from 0.194 (during 25% MVC) to 0.753 (during 100% MVC). The reliability of the outcome variables was excellent. Conclusion: The EMG amplitude of the three main foot dorsiflexors exhibited more variance in the dependent variable (torque) when foot dorsiflexion intensity increases. |
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