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Spectral compression of surface electromyogram (sEMG) is associated with onset of localized muscle fatigue. The spectral compression has been explained based on motor unit synchronization theory. According to this theory, motor units are pseudo randomly excited during muscle contraction, and with the onset of muscle fatigue the recruitment pattern changes such that motor unit firings become more synchronized...
A simple online system for collecting EMG data from surface recording electrodes and force data has been developed to study muscular weakness in multiple sclerosis (MS) patients and children. The parameters of force, integrated EMG, peak positive and negative amplitudes and zero-crossing frequencies are simultaneously recorded. Leg measurements show clear quantifiable differences between normal muscles...
Information relevant to back-pain treatment planning and outcome can be formulated by measuring the fatigue process of lumbar musculature. The clinical validation of an EMG median frequency technique for identifying lumbar muscle insufficiency in back patients and control subjects is presented. The results from two-group, stepwise discriminant analyses to identify low-back pain and non-low-back pain...
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