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Gender, muscle, and velocity comparisons of mechanomyographic and electromyographic responses during isokinetic muscle actions
Author(s) -
Cramer Joel T.,
Housh Terry J.,
Weir Joseph P.,
Johnson Glen O.,
Berning Joseph M.,
Perry Sharon R.,
Bull Anthony J.
Publication year - 2004
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2003.00317.x
Subject(s) - vastus medialis , concentric , electromyography , amplitude , physical medicine and rehabilitation , medicine , vastus lateralis muscle , anatomy , physics , mathematics , geometry , skeletal muscle , quantum mechanics
The purpose of this study was to examine the responses of peak torque (PT), mean power output (MP), mechanomyographic (MMG) and electromyographic (EMG) amplitude and mean power frequency (MPF) of the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM) in males and females during maximal, concentric isokinetic muscle actions. Subjects performed maximal leg extensions at 60° s −1 , 120° s −1 , 180° s −1 , 240° s −1 , 300° s −1 , 360° s −1 , 420° s −1 , and 480° s −1 . No gender differences were obser‐ved, but there were muscle‐specific differences for the patterns of MMG MPF, EMG amplitude, and EMG MPF. The MP and MMG amplitude increased to 180–240° s −1 , plateaued, and then decreased to 480° s −1 . MMG MPF for the VL and VM remained unchanged to 300° s −1 , but then increased to 480° s −1 . The EMG amplitude for the RF and EMG MPF for the VL decreased across velocity. Overall, these findings indicated that there were muscle‐specific, velocity‐related differences in the associations among motor control strategies (EMG amplitude and MPF) and the mechanical aspects of isokinetic muscular activity (MMG amplitude and MPF).