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Spinal and supraspinal mechanisms affecting torque development at different joint angles

Abstract : INTRODUCTION: We examined the neural mechanisms responsible for plantar flexion torque changes at different joint positions. METHODS: Nine subjects performed maximal voluntary contractions (MVC) at 6 ankle-knee angle combinations [3 ankle angles (dorsiflexion, anatomic position, plantar flexion) and 2 knee angles (flexion, full extension)]. Neural mechanisms were determined by V-wave, H-reflex (at rest and during MVC), and electromyography during MVC (RMS), normalized to the muscle compound action potential (V/Msup , Hmax /Mmax , Hsup /Msup and RMS/Msup ) and voluntary activation (VA), while muscle function was assessed by doublet amplitude. RESULTS: MVC and doublet amplitude were significantly lower at plantar flexion (P < 0.01), while VA was significantly lower at dorsiflexion and full knee extension (P < 0.05). V/Msup and RMS/Msup were significantly lower at knee extension (P < 0.01), while Hsup /Msup was not affected by joint angle. CONCLUSIONS: These results indicate that joint positions leading to muscle lengthening produce reduced neural drive, due mainly to supraspinal mechanisms.
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01302972
Contributeur : Caps - Université de Bourgogne <>
Soumis le : vendredi 15 avril 2016 - 15:17:54
Dernière modification le : jeudi 7 février 2019 - 14:45:52

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Maria Papaiordanidou, Valérie Mustacchi, Jean-Damien Stevenot, Michele Vanoncini, Alain Martin. Spinal and supraspinal mechanisms affecting torque development at different joint angles. Muscle & nerve. Supplement., 2016, 53 (4), pp.626-632. ⟨10.1002/mus.24895⟩. ⟨hal-01302972⟩

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