Abstract
Background. Low back pain is the primary reason for physical inactivity in individuals that are middle aged and younger. Lumbar resistance exercise has been shown to help with treatment and prevention of low back pain. Purpose. The purpose of this study was to examine resting mechanomyographic (MMG) mean frequency (MNF) for the erector spinae and trapezius muscles prior to, and following resistance exercise. Methods. Twenty healthy, college-aged men were measured for resting MMG MNF prior to, and following a resistance training workout. Resistance exercise consisted of three sets of ten repetitions on the conventional deadlift, bent-over row, and lat pulldown exercises, with 1 min of rest between each set, for each of the three exercises. Results. There was an approximate 4.7% increase and a 12% decrease in normalized MMG MNF after resistance exercise for the erector spinae and trapezius muscles, respectively. Conclusion. The differences between the erector spinae and trapezius responses for post-exercise resting MMG MNF were potentially due to muscle fatigue. Furthermore, we speculate that low threshold motor units from the slow-twitch fibers of the erector spinae muscle increased their firing rate, as a result of incomplete muscle fatigue, to help maintain the appropriate vertebral postural tonus position.
Published Version
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