Effects of ageing on motor unit activation patterns and reflex sensitivity in dynamic movements

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
J KallioVesa Linnamo

Abstract

Both contraction type and ageing may cause changes in H-reflex excitability. H reflex is partly affected by presynaptic inhibition that may also be an important factor in the control of MU activation. The purpose of the study was to examine age related changes in H-reflex excitability and motor unit activation patterns in dynamic and in isometric contractions. Ten younger (YOUNG) and 13 elderly (OLD) males performed isometric (ISO), concentric (CON) and eccentric (ECC) plantarflexions with submaximal activation levels (20% and 40% of maximal soleus surface EMG). Intramuscular EMG data was analyzed utilizing an intramuscular spike amplitude frequency histogram method. Average H/M ratio was always lowest in ECC (n.s.). Mean spike amplitude increased with activation level (P<.05), whereas no significant differences were found between contraction types. Both H-reflex excitability, which may be due to an increase in presynaptic inhibition, and mean spike frequency were higher in YOUNG compared to OLD. In OLD the mean spike frequency was significantly smaller in CON compared to ISO. Lack of difference in mean spike amplitude and frequency across contraction types in YOUNG would imply a similar activation strategy, whereas the lower f...Continue Reading

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Citations

Nov 22, 2013·PloS One·Annapoorna ChandrasekharWan Abu Bakar Wan Abas
Jul 4, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·J KallioV Linnamo
Apr 25, 2014·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Paul McCoolJohn J Soraghan
May 31, 2015·Experimental Brain Research·Isabella A MotaJosep Valls-Solé
Oct 18, 2014·Frontiers in Human Neuroscience·Jouni KallioVesa Linnamo

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