Journal of Applied Physiology
Vol. 82, No. 3,
pp. 1003-1007,
March 1997
EXERCISE AND MUSCLE
special communication
Mechanomyographic responses to maximal eccentric isokinetic muscle
actions
Douglas B.
Smith1,
, Terry J.
Housh1,
Jeffrey R.
Stout2,
Glen O.
Johnson1,
Tammy K.
Evetovich1, and
Kyle T.
Ebersole1
1 Center for Youth Fitness and
Sports Research, School of Health and Human Performance, University of
Nebraska at Lincoln, Lincoln 68588-0229; and
2 Exercise Science Department,
Creighton University, Omaha, Nebraska 68178
Received 14 June 1996; accepted in final form 29 October 1996.
Smith, Douglas B., Terry J. Housh, Jeffrey R. Stout, Glen O. Johnson, Tammy K. Evetovich, and Kyle T. Ebersole.
Mechanomyographic responses to maximal eccentric isokinetic muscle
actions. J. Appl. Physiol. 82(3):
1003-1007, 1997.
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°/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°/s (302 ± 128 mV). These findings indicated a velocity-related dissociation between
MMG and peak torque for maximal eccentric isokinetic muscle actions.
mechanomyography; eccentric muscle action
0161-7567/97 $5.00
Copyright © 1997 the American Physiological Society
