Objective of the study was to theoretically analyze the women`s muscle strength and physical working capacity variations with the menstrual cycle phases. Methods and structure of the study. The study was designed to analyze and classify findings of practical studies with concern to the muscle strength variations with the menstrual cycle phases (15,842 sources in total for 2005 through 2018) available in the electronic databases. Results and conclusions. As found by the studies, a woman`s muscle strength averages 63.5% of a man`s one, with the isometric muscle strength of a woman`s upper body and lower limbs averaging 55.8% and 71.9% of a man`s one, respectively. It was also found by a few studies that the lower-limb muscle strength of the contraceptive-using women appear to be menstrual-cycle-phase dependent, with a special fall in the follicular phase. Analyses of the study reports on the subject have found no systemic significant variations of the women`s muscle strength with the menstrual cycle phases - as verified, among other things, by the conflicting findings of the studies focused on specific menstrual cycle phases assumed to be critical. The problem is further complicated by the differences in the muscle strength test methods. At the same time, the researchers generally recognize the importance of the strength training systems being reasonably customized to the menstrual cycle phases for the muscle mass building purposes. Note that we also used for our analyses findings of the studies commissioned by the Federal Scientific Center of the National Physical Culture and Sports Research Institute.
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