Abstract
The purpose of this investigation was to examine the effects of velocity of contraction on the mechanomyographic (MMG) responses to maximal concentric isokinetic leg extension movements. Eight adult males [mean (SD) age, 22.3 (1.3) years] performed maximal leg extensions on a calibrated Cybex 6000 dynamometer at velocities of 60, 120, 180, 240, 300, and 360° · s−1. MMG responses were detected by a piezoelectric recording device placed over the vastus lateralis muscle. Intraclass reliability correlations ranged from R = 0.84 to 0.97 and from 0.90 to 0.99 for peak torque and MMG amplitude values, respectively, with no significant differences (P > 0.05) between the mean values for test versus retest at any contraction velocity. There were significant differences (P < 0.05) in peak torque at all velocities except 240 [135 (27) Nm] versus 300 [127 (27) Nm], and 300 versus 360° · s−1 [115 (37) Nm]. The mean MMG amplitude at 60° · s−1 [61 (67) mV] was significantly less (P < 0.05) than that at 360° · s−1 [452 (451) mV]. These results indicate a velocity-related dissociation between MMG amplitude and peak torque. Furthermore, it was hypothesized that the increases in MMG amplitude were due to velocity-related decreases in muscle stiffness which allowed for greater muscle fiber oscillations.
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Accepted: 24 July 1996
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Evetovich, T., Housh, T., Stout, J. et al. Mechanomyographic responses to concentric isokinetic muscle contractions. Eur J Appl Physiol 75, 166–169 (1997). https://doi.org/10.1007/s004210050142
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DOI: https://doi.org/10.1007/s004210050142