Fourier Analysis of the Normal Human Electromyogram

Electrical Activity and Force During Voluntary Contraction of Normal and Diseased Muscle

“…Analysis of simulated and recorded muscle action potentials showed that the frequency distribution was not changed by the repetition rate and the amplitude of discharge. The duration of the main phase of the motor unit potential but not the entire duration of the potential changed the distribution of the frequencies (Cenkovich and Gersten 1963). Moreover, the distribution of the frequencies was within a wide limit independent of the muscle force (Walton 1952, Fex and Krakau 1957, Kaiser and Peter-sCn 1963.…”

Quantitative electromyography in polymyositis and dermatomyositis

“…Polyphasic motor unit potentials with short duration components may be an expression of disintegration and temporal dispersion within the motor unit ( Kugelberg 1947, Stdlberg 1977. Such potentials move the spectrum towards high frequencies (Cenkovich & Gersten 1963, Kaiser & Peters& 1963, and HFD of the spectrum has indeed also been found in myopathies (Wulton 1952). In the present study increasing HFD was generally related to increasing paresis and also to increasing spontaneous activity.…”

The Bilateral Response of the Temporal Muscle in the Rhesus Monkey (Macaca mulatta) to Short-Term Detachment of the Muscle and Increased Loading of the Mandible

“…The spontaneous EMG activity was analyzed utilizing (1) a spectral analyzer' and (2) a spike counter. Spectral analysis treats the action potentials of the EMG as a summation of simpler waveforms and differentiates the complex EMG signals into basic components occurring in preselected frequency bands.21, 22 The power or amplitude of each of these frequency components can be compared in a bar histogram. Spectral analysis was completed for a given frequency (i.e., 20 ± 1 Hz) with a 1 Hz resolution over a 3-minute epoch in which the mean amplitude of the power spectrum was averaged from every 10th second amplitude.…”