Age-related change in motor unit activation strategy in force production: a mechanomyographic investigation

Muscle & Nerve
Kumi AkatakiKunihiko Ito

Abstract

This study was designed to examine the effect of increasing age on the recruitment and activation of motor units (MU) in the biceps brachii muscle, using the mechanomyogram (MMG)/force relationship during isometric ramp contractions. The relationships between the root mean squared amplitude (RMS) and mean power frequency (MPF) of the MMG and relative force (% MVC) in the elderly (male, n = 10, age = 69.8 +/- 4.7 years, mean +/- SD) were markedly different from those in the young group (male, n = 15, age = 22.7 +/- 1.8 years). In elderly individuals, the RMS increased progressively with force up to 57.6 +/- 3.4% MVC, when a brief rapid increase was followed by a stable trend beyond 63.6 +/- 3.7% MVC. The MPF increased slowly up to 59.4 +/- 2.3% MVC; after a temporary reduction from 59.4% to 64.3 +/- 2.0% MVC, it then increased progressively again. In conjunction with absolute force (F(abs)), both the RMS and MPF in the elderly were smaller than those in the young group throughout the submaximal levels of force exerted. The results reflect an alteration in MU activation strategy, with a predominant role for MUs with slow-twitch fibers and an effective fused tetanus induced at lower firing rate of the MUs, resulting from age-relat...Continue Reading

References

May 18, 1979·European Journal of Applied Physiology and Occupational Physiology·G Kamen
Sep 1, 1977·Journal of Neuropathology and Experimental Neurology·Y KawamuraP J Dych
Nov 1, 1977·Journal of the Neurological Sciences·B E Tomlinson, D Irving
Jan 1, 1992·European Journal of Applied Physiology and Occupational Physiology·C OrizioA Veicsteinas
May 1, 1992·Journal of Applied Physiology·M J Stokes, R G Cooper
Oct 1, 1991·Journal of Applied Physiology·M V NariciP Cerretelli
Dec 1, 1991·Journal of Applied Physiology·F P Pettigrew, E G Noble
Feb 1, 1990·Journal of Applied Physiology·C OrizioA Veicsteinas
Jan 1, 1989·Journal of Neurophysiology·J K EngelhardtM H Chase
Aug 1, 1988·Annals of Neurology·J E HowardL J Dorfman
Feb 18, 1974·Pflügers Archiv : European journal of physiology·A Gydikov, D Kosarov
Apr 1, 1973·Journal of Neurology, Neurosurgery, and Psychiatry·M J CampbellF Petito
Jan 1, 1984·Physical Therapy·R M NelsonN L Urbscheit
Jun 1, 1995·Scandinavian Journal of Medicine & Science in Sports·M M PorterJ Lexell
Jun 1, 1995·Journal of Applied Physiology·D N ProctorP W Lemon
Jan 1, 1994·European Journal of Applied Physiology and Occupational Physiology·A HeinonenI Vuori
Dec 1, 1993·Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquée·T J DohertyW F Brown
May 1, 1996·Muscle & Nerve·Z ErimT Aoki
Jan 1, 1996·European Journal of Applied Physiology and Occupational Physiology·F EspositoC Orizio
Dec 1, 1995·Journal of Applied Physiology·G KamenC Patten
Jun 1, 1997·Muscle & Nerve·M R RoosA A Vandervoort
May 23, 1998·Journal of the Neurological Sciences·M MonemiL E Thornell
May 20, 1998·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·S N BoaroB König
Aug 13, 1999·Journal of Applied Physiology·D M ConnellyA A Vandervoort
Sep 30, 1948·The Journal of Physiology·G Gordon, A H Holbourn
Jan 1, 1992·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·C OrizioA Veicsteinas

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Citations

Oct 14, 2005·European Journal of Applied Physiology·Norihiro ShimaKyonosuke Yabe
Jun 9, 2005·European Journal of Applied Physiology·Fabio EspositoClaudio Orizio
Oct 7, 2006·European Journal of Applied Physiology·William P S McKayBrian L F Daku
Dec 21, 2005·Biomedical Engineering Online·Travis W BeckMichelle Mielke
Jun 12, 2010·Biomedical Engineering Online·Natasha AlvesTom Chau
May 25, 2010·Journal of Neuroengineering and Rehabilitation·Natasha Alves, Tom Chau
Jun 14, 2008·Journal of Strength and Conditioning Research·José L Toca-HerreraLuis M González
Oct 18, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Liping QiMartin Ferguson-Pell
Jan 28, 2009·Manual Therapy·Sureeporn Uthaikhup, Gwendolen Jull
May 6, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Jaroslaw MarusiakArtur Jaskólski
Oct 31, 2006·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Eric D RyanTrent J Herda
May 28, 2009·Muscle & Nerve·Jarosław MarusiakArtur Jaskólski
Feb 25, 2006·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Travis W BeckMoh H Malek
Oct 26, 2005·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Travis W BeckMoh H Malek
Aug 16, 2005·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Anna JaskólskaArtur Jaskólski
Aug 2, 2005·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Scott Rubinstein, Gary Kamen
Nov 12, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Liping QiMartin Ferguson-Pell
Jan 22, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Michael A CooperAndrew C Fry

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