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Excerpt
The purpose of the present investigation was to examine the effect of unilateral concentric isokinetic leg extension training on peak torque (PT) and mechanomyographic (MMG) responses. Twenty-one adult males were randomly assigned into a training (TRN, n=12) or control (CTL, n=9) group. The training group performed six sets of ten leg extensions of the non-dominant limb three days per week for twelve weeks. Training was performed at a velocity of 90°·s−1 on a calibrated Cybex 6000 dynamometer. All subjects were tested before the start of the training period and every four weeks thereafter for PT and MMG responses at a velocity of 90°·s−1. The MMG signal was recorded using a piezoelectric contact sensor placed mid-thigh over the vastus lateralis muscle. Separate two-way mixed factorial ANOVAs with Tukey post-hoc procedures were used to determine differences in PT and MMG amplitude across the training period. (Table)
The reason for the increase in PT in the absence of change in MMG amplitude in the vastus lateralis may be due to hypertrophy and/or changes in other muscle groups involved in leg extension.
