Combined effects of fatigue and temperature manipulation on skeletal muscle electrical and mechanical characteristics during isometric contraction

Emiliano Cè, Susanna Rampichini, Luca Agnello, Eloisa Limonta, Arsenio Veicsteinas, Fabio Esposito

Research output: Contribution to journalArticle

Abstract

Peripheral fatigue and muscle cooling induce similar effects on sarcolemmal propagation properties. The aim of the study was to assess the combined effects of muscle temperature (Tm) manipulation and fatigue on skeletal muscle electrical and mechanical characteristics during isometric contraction. After maximum voluntary contraction (MVC) assessment, 16 participants performed brief and sustained isometric tasks of different intensities in low (Tm L), high (Tm H) and neutral (Tm N) temperature conditions, before and after a fatiguing exercise (6s on/4s off at 50% MVC, to the point of fatigue). During contraction, the surface electromyogram (EMG) and force were recorded from the biceps brachii muscle. The root mean square (RMS) and conduction velocity (CV) were calculated off-line. After the fatiguing exercise: (i) MVC decreased similarly in all Tm conditions (PL compared to Tm N and Tm H in all brief and sustained contractions (PL after fatigue suggests that Tm L and fatigue have a combined and additional effect on sarcolemmal propagation properties. Despite these changes, force generating capacity was not affected by Tm manipulation. A compensatory mechanism has been proposed to explain this phenomenon.

Original languageEnglish
Pages (from-to)348-355
Number of pages8
JournalJournal of Electromyography and Kinesiology
Volume22
Issue number3
DOIs
Publication statusPublished - Jun 2012

Keywords

  • Conduction velocity
  • EMG
  • Isometric contraction
  • Muscle temperature
  • Neuromuscular efficiency

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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