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Reliability of the log-transformed EMG amplitude-power output relationship for incremental knee-extensor ergometry
Travis Eason1,2, Christine R Gavel1,2, Kyle A Hawley1,2
1Integrative Physiology of Exercise Laboratory, Eugene Applebaum College of Pharmacy & Health Sciences, 259 Mack Avenue, Room 2248, Detroit, Michigan, 48201, USA.
Introduction:
The purpose of this investigation was to determine the reproducibility of the log-transformed model for electromyography (EMG) amplitude during incremental single-leg knee-extensor exercise.
Methods:
Eight healthy college-aged men performed 3 incremental tests on separate occasions on a knee-extensor ergometer. EMG amplitude was analyzed for each participant on each occasion for the rectus femoris and vastus medialis muscles at 4 different exercise power outputs (30%, 50%, 70%, and 90%) corresponding to each participant's maximal power output. Intraclass correlation coefficients (ICC) were determined for the slope and y-intercept terms derived from the log-transformed EMG amplitude-power output relationship for each muscle.
Results:
The ICC values for the rectus femoris (slope = 0.779; y-intercept = 0.787) and vastus medialis (slope = 0.756; y-intercept = 0.763) muscles were high.
Conclusions:
The log-transformed EMG amplitude-power output relationship is a reliable index for measuring motor unit activation.
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