Bilateral soleus H-reflexes in humans elicited by simultaneous trains of stimuli: symmetry, variability, and covariance

Journal of Neurophysiology
Rinaldo André Mezzarane, A F Kohn

Abstract

Experiments using electrical and mechanical activation of spinal reflexes have contributed important results toward the understanding of neuronal and synaptic dynamics involved in spinal neural circuits as well as their response to different inputs. In this work, data obtained from the simultaneous stimulation of both legs are analyzed to provide information on the degree of symmetry of the respective spinal reflex circuits and on the characteristics of reflex variability. H-reflexes recorded from relaxed muscles show a frequency-dependent amplitude depression when elicited by a train of stimuli. This effect has been attributed to homosynaptic depression. Soleus H-reflexes were recorded in response to trains of simultaneous stimuli applied to both legs in right-handed subjects that were sitting in a relaxed state. The first objective was to verify the existence of asymmetries in H-reflex parameters obtained from the two legs. We measured the mean, variance, and coefficient of variation of the depressed H-reflex amplitudes and the time constant of decay toward the depressed plateau. The second objective was the analysis of the time correlation of subsequent H-reflex amplitudes in a long train of responses recorded from a given l...Continue Reading

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Citations

Apr 5, 2014·Frontiers in Human Neuroscience·Rinaldo A MezzaraneE P Zehr
Nov 1, 2008·The European Journal of Neuroscience·Paola BorroniFausto Baldissera
Jul 15, 2005·Journal of Neurophysiology·E ManjarrezA F Kohn
Mar 31, 2015·Journal of Applied Physiology·Dimitry G SayenkoYury P Gerasimenko
Apr 24, 2015·Journal of Neurophysiology·Ursula S HofstoetterKaren Minassian
Jul 21, 2017·Frontiers in Human Neuroscience·Rinaldo A MezzaraneE Paul Zehr
Apr 19, 2020·Experimental Brain Research·Ian C QuadradoRinaldo André Mezzarane
Oct 31, 2009·Medical Engineering & Physics·Rinaldo André Mezzarane, André Fabio Kohn

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