Mechanomyographic responses to maximal eccentric isokinetic muscle actions | Zendy

Douglas B. Smith | Zendy; Terry J. Housh | Zendy; Jeffrey R. Stout | Zendy; Glen O. Johnson | Zendy; Tammy K. Evetovich | Zendy; Kyle T. Ebersole | Zendy

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Mechanomyographic responses to maximal eccentric isokinetic muscle actions

Author(s) -

Douglas B. Smith,

Terry J. Housh,

Jeffrey R. Stout,

Glen O. Johnson,

Tammy K. Evetovich,

Kyle T. Ebersole

Publication year - 1997

Publication title -

journal of applied physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.253

H-Index - 229

eISSN - 8750-7587

pISSN - 1522-1601

DOI - 10.1152/jappl.1997.82.3.1003

Subject(s) - eccentric , physical medicine and rehabilitation , eccentric exercise , muscle contraction , medicine , anatomy , physical therapy , muscle damage , physics , quantum mechanics

The purpose of the present investigation was to examine the mechanomyographic (MMG) responses to maximal eccentric isokinetic muscle actions. Eight adult male volunteers [age 22 +/- 2 (SD) yr] performed maximal eccentric muscle actions of the leg extensors at 60, 90, 120, and 180 degrees /s on a Cybex 6000 isokinetic dynamometer. MMG was detected by a piezoelectric crystal contact sensor placed over the vastus lateralis muscle. Test-retest intraclass correlations ranged from R = 0.88 to 0.97 for peak torque and from R = 0.97 to 0.98 for root mean square MMG amplitude values. There was no significant (P > 0.05) velocity-related change in eccentric peak torque; however, there was a significant (P < 0.05) increase in MMG between 60 [119 +/- 44 (SE) mV] and 180 degrees/s (302 +/- 128 mV). These findings indicated a velocity-related dissociation between MMG and peak torque for maximal eccentric isokinetic muscle actions.

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