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

Muscle activity and fatigue in the shoulder muscles of assembly-plant employees.

“…In this study there was no statistical difference between the groups of young and middle-aged women, in either maximal force or in ADPF, although this finding should be expected since the maximal force diminishes with increasing age and is lower in women than in men (8). The men of the present study had a higher maximal force than the women, but there was no difference in ADPF.…”

The utility of interference pattern analysis

“…the amplitude to increase more than the force. 66 Some of the differences are probably due to differences in methods, the different muscles studied, and different degrees of fatigue. The mean amplitude per turns of the turns/amplitude analysis increases linearly with force up to MVC.…”

“…66 Amplitude measurements and spike counting are methods within the time domain, whereas power spectrum is analyzed within the frequency domain. For more detailed descriptions of the methods, readers are referred to the indicated literature.…”

Analysis of intramuscular electromyogram signals

“…In most cases, the signal is not fully decomposed but rather analysed as an interference signal and characterized by global descriptors, or only a few representative action potentials are extracted. The turns and amplitude analysis is an example of these methods (Fuglsang-Frederiksen 1981). A turn in the EMG signal is defined as a change in the slope sign, with some special features (e.g.…”