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High rate of injuries detected during certain periods of menstrual cycle, raised the suggestion of hormonal impact on soft tissue and neuromuscular control with subsequent lost in joint stability, deterioration of postural balance and injury development. The aim of present study was to investigate possible differences in static postural balance during the preovulatory and postovulatory stages of menstrual cycle. Twenty one randomly selected eumenorrheic female university students accepted to participate in this study. Postural stability index (PSI) and sway distances were measured on a computer-based static stability force-platform with eyes open and eyes closed trials. Height, weight, waist and hip circumferences of the subjects were also measured. Evaluation of body fat percentage (BF) was made through biceps-triceps-subscapular-suprailiac skin-fold thickness measurements. Analysis of balance scores demonstrated better postovulatory comparing to preovulatory postural stability in terms of PSI (93.29 ± 4.26 versus 91.05 ± 6.21, p = 0.035), antero-posterior (0.99 ± 0.72 versus 0.77 ± 0.51 cm, p = 0.05) and medio-lateral (0.77 ± 0.64 versus 0.50 ± 0.42 cm, p = 0.04) sway distances. There was also statistically significant correlation between anthopometric and balance parameters with better postural balance in thinner participants. Our findings demonstrated that menstrual cycle does indeed influence postural stability, which also is the function of body composition in young females. Key words: Postural balance, menstrual cycle, females, periods.

[corrected] To define if such crucial body composition parameters like body density (Db) and body surface area (BSA) could be considered in the frame of yin-yang concept, i.e., one of the most popular in conventional biomedical science theories of Chinese medicine.Standardized Eurofit Pysical Fitness Test Battery reports of 715 junior school children have been evaluated for association of their body composition parameters with corresponding motoric fitness test results. Equations for BSA and Db calculation included height, weight, and skin-fold thickness values of the tests.Correlative analysis of major physical fitness parameters, obtained from 715 junior school children, demonstrated that participants with high BSA/Db ratio had better yang-featured anaerobic performance, whereas those with low BSA/Db ratio presented with better yin-featured aerobic performance. This result coincided with proposed suggestions to treat BSA as external yang component and Db as internal yin component of body composition. Calculated confidence intervals for BSA/Db ratio ranged between 1.073-1.15, which can be accepted as optimal for junior school children yang/yin ratio of body composition.Easily accessible BSA and Db can provide specialists with useful preliminary information for generating reasonable exercise and nutritional programs.