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Effects of temperature and fatigue on the electromechanical delay components
Author(s) -
Cè Emiliano,
Rampichini Susanna,
Agnello Luca,
Limonta Eloisa,
Veicsteinas Arsenio,
Esposito Fabio
Publication year - 2013
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23627
Subject(s) - isometric exercise , muscle fatigue , biceps brachii muscle , biceps , electromyography , muscle contraction , materials science , contraction (grammar) , physical medicine and rehabilitation , biomedical engineering , medicine , physical therapy , anatomy
: 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 (Tm N ), low (Tm L ), and high (Tm H ) 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 : Tm L 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. Muscle Nerve, 2013