Abstract
Quantitative characteristics of the neuromuscular state in women (n = 23; age, 19.9 ± 1.4 years) were studied in four (early and late follicular, ovulatory, and luteal) phases of the menstrual cycle, in the spring and autumn/winter seasons, depending on the type of regulation of the autonomic nervous system, based on linear and novel nonlinear parameters of interference electromyography in m. biceps br. and the activity of the motor units of m. triceps br. Statistically significant differences in the neuromuscular state, such as a decrease in all nonlinear parameters, i.e., simplification of the temporal structure of the interference electromyography signal and an increase in the frequency of impulses of motor units, are due to the combined effect of the ovulatory phase and the spring season. In addition, the greatest influences on the neuromuscular state were recorded in subjects with the vagotonic type of regulation of the autonomic nervous system.
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