Responses of group III and IV muscle afferents to dynamic exercise

Journal of Applied Physiology
C M AdreaniM P Kaufman

Abstract

Tetanic contraction of hindlimb skeletal muscle, induced by electrical stimulation of either ventral roots or peripheral nerves, is well known to activate group III and IV afferents. Nevertheless, the effect of dynamic exercise on the discharge of these thin fiber afferents is unknown. To shed some light on this question, we recorded in decerebrate cats the discharge of 24 group III and 10 group IV afferents while the mesencephalic locomotor region (MLR) was stimulated electrically. Each of the 34 afferents had their receptive fields in the triceps surae muscles. Stimulation of the MLR for 1 min caused the triceps surae muscles to contract rhythmically, an effect induced by an alpha-motoneuron discharge pattern and recruitment order almost identical to that occurring during dynamic exercise. Eighteen of the 24 group III and 8 of the 10 group IV muscle afferents were stimulated by MLR stimulation. The oxygen consumption of the dynamically exercising triceps surae muscles was increased by 2.5-fold over their resting levels. We conclude that low levels of dynamic exercise stimulate group III and IV muscle afferents.

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Citations

Apr 12, 2001·American Journal of Physiology. Heart and Circulatory Physiology·S G Hayes, M P Kaufman
Mar 16, 2002·Journal of Applied Physiology·P Alexander DerchakJerome A Dempsey
Jul 23, 2005·Journal of Applied Physiology·Lawrence I Sinoway, Jianhua Li
Jan 10, 2006·American Journal of Physiology. Heart and Circulatory Physiology·Shawn G HayesMarc P Kaufman
Aug 7, 2010·Journal of Applied Physiology·Marc P Kaufman
Feb 4, 2012·Clinical and Experimental Pharmacology & Physiology·Markus Amann
Jul 24, 2012·American Journal of Respiratory and Critical Care Medicine·Philippe GagnonFrançois Maltais
Jul 6, 2012·Acta Physiologica·M J RossmanR S Richardson
Oct 16, 2012·Experimental Physiology·Michael J WhiteGeorge M Balanos
Jun 8, 2014·Physiological Reports·Katsuya YamauchiMarc P Kaufman
Oct 28, 2014·Physiological Reports·Keisho KatayamaShigehiko Ogoh
Apr 26, 2015·American Journal of Physiology. Heart and Circulatory Physiology·Steven W CoppMarc P Kaufman
Nov 27, 2015·The Journal of Physiology·Steven W CoppMarc P Kaufman
Nov 12, 2016·Journal of Applied Physiology·Massimo VenturelliRussell S Richardson
Sep 2, 2017·Journal of Applied Physiology·Ryan M BroxtermanRussell S Richardson
Jan 31, 2019·Journal of Neurophysiology·Lyndon J SmithAlexander R Burton
Apr 1, 2019·Experimental Brain Research·David PhillipsAndrew Karduna
Aug 14, 2020·Experimental Physiology·Philippe Haouzi
Feb 4, 1999·Journal of Applied Physiology·D I CarrascoC A Ray
Feb 4, 1999·Journal of Applied Physiology·M D HerrL I Sinoway
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Jun 11, 1998·Journal of Applied Physiology·C M Adreani, M P Kaufman
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Feb 26, 2008·American Journal of Physiology. Heart and Circulatory Physiology·Holly R MiddlekauffJignesh Patel
Sep 14, 2010·American Journal of Physiology. Heart and Circulatory Physiology·Melissa A HaymanRussell S Richardson
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Sep 30, 2010·The Journal of Physiology·John McDanielRussell S Richardson
Feb 22, 2013·Journal of Neurophysiology·Michael P JankowskiH Richard Koerber

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