Decoupling of stretch reflex and background muscle activity during anticipatory postural adjustments in humans.

Experimental Brain Research
Siddharth VedulaPaul J Stapley

Abstract

We studied the evolution of stretch reflexes in relation to background electromyographic (EMG) activity in the soleus muscle preceding the onset of voluntary arm raise movements. Our objective was to investigate if changes in reflex EMG and muscle activity occur simultaneously and are similarly scaled in amplitude. Ten human subjects stood with each foot on pedals able to exert short dorsiflexor pulses during stance. Subjects were asked to product consistent voluntary arm raise movements to a target upon a visual cue. In (1/4) of trials, no pulse perturbations were given, but in the remaining (3/4)'s of all trials pulses were given randomly during a 600-ms period, from 400 ms before until 200 ms after the onset of the movements. Perturbation trials were sorted into 20-ms bins post hoc, and the amplitude of the reflex EMG component was calculated and compared to the EMG activity obtained when no pulses were given. Results showed that despite exhibiting similar profiles over time, the background EMG consistently inhibited before the reflex EMG did. However, times of reactivation (rebound) were variable across subjects, with background EMG activating before reflex for some subjects and vice versa for others. The minimum values of ...Continue Reading

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Citations

Mar 23, 2011·Experimental Brain Research·Norman Holl, Volker Zschorlich
Feb 25, 2015·European Journal of Pain : EJP·S ShiozawaT Graven-Nielsen
Sep 28, 2013·Human Movement Science·Shinichiro ShiozawaThomas Graven-Nielsen
Jul 19, 2018·Journal of Neurophysiology·Alexander StamenkovicMark A Hollands

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