Spinal and supraspinal mechanisms affecting torque development at different joint angles

Muscle & Nerve
Maria PapaiordanidouA Martin

Abstract

We examined the neural mechanisms responsible for plantar flexion torque changes at different joint positions. 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. 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. These results indicate that joint positions leading to muscle lengthening produce reduced neural drive, due mainly to supraspinal mechanisms.

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Citations

Jun 9, 2017·Experimental Physiology·Marcel B LanzaJonathan P Folland
Jul 22, 2018·Scandinavian Journal of Medicine & Science in Sports·Marcel B LanzaJonathan P Folland
Aug 23, 2020·International Journal of Environmental Research and Public Health·Giuseppe CoratellaEmiliano Cè
Sep 10, 2019·Frontiers in Bioengineering and Biotechnology·Martin BehrensVolker R Zschorlich

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