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The purpose of the present investigation was to examine the effects of knee angular velocity on the mean power frequency (MPF) and amplitude of the mechanomyographic (MMG) signal during maximal eccentric (ECC) isokinetic muscle actions. Eleven adult subjects performed maximal ECC muscle actions of the leg extensors on a calibrated Cybex 6000 dynamometer at knee angular velocities of 60, 120, and 180 degrees.s-1. MMG was detected by a piezoelectric crystal contact sensor placed over the vastus lateralis muscle. There were no significant (p > 0.05) velocity-related changes in ECC peak torque (PT) or MMG MPF, however, the mean MMG amplitude value at 60 degrees.s-1 was significantly less (p < 0.05) than that at 180 degrees.s-1. These results did not support our previous hypothesis that the velocity-related increase in MMG amplitude for maximal ECC isokinetic muscle actions was due to selective recruitment of fast twitch fibers and derecruitment of slow twitch fibers with increasing velocity.
T K Evetovich, and
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J P Weir, and
G O Johnson, and
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K T Ebersole
December 2000,
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K T Ebersole
September 2002,
Electromyography and clinical neurophysiology,
T K Evetovich, and
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D B Smith, and
K T Ebersole
October 2004,
Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology,
T K Evetovich, and
T J Housh, and
J P Weir, and
G O Johnson, and
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K T Ebersole
March 2010,
Physiological measurement,
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March 2008,
Journal of neuroscience methods,
T K Evetovich, and
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June 2008,
Journal of neuroscience methods,
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T K Evetovich, and
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Electromyography and clinical neurophysiology,
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January 2007,
Electromyography and clinical neurophysiology,
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Medicine and science in sports and exercise,
