Effects of temperature and fatigue on the electromechanical delay components.

Abstract:

INTRODUCTION:Neuromuscular activation can be influenced by both muscle temperature (Tm) and fatigue. METHODS:To assess the effects of Tm and fatigue on the electromechanical delay (EMD), 15 participants performed voluntary isometric contractions of different intensities under neutral (TmN), low (TmL), and high (TmH) Tm, before and after a fatiguing exercise. During contraction, electromyogram (EMG), mechanomyogram (MMG), and force (F) were recorded from the biceps brachii muscle. The EMD and the latencies between EMG and MMG (Δt EMG-MMG, which includes the electrochemical processes of EMD) and between MMG and F (Δt MMG-F, which includes the mechanical processes of EMD) were calculated. RESULTS:TmL increased only Δt EMG-MMG, both before and after fatigue. Fatigue lengthened EMD, Δt EMG-MMG, and Δt MMG-F under all Tm to a similar extent. CONCLUSIONS:While fatigue increased all EMD components, muscle cooling affected only the electrochemical but not the mechanical processes of EMD.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Cè E,Rampichini S,Agnello L,Limonta E,Veicsteinas A,Esposito F

doi

10.1002/mus.23627

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

566-76

issue

4

eissn

0148-639X

issn

1097-4598

journal_volume

47

pub_type

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