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Abstract
This study was conducted to determine the impact of different menstrual cycle phases on postural stability of adolescent females. 30 adolescent females participated in the current study, their age ranged from 17 to 20 (19±0.93) yrs,their BMI ranged from 18 to 25(22.9±2.07) kg/m²; all of them were nullipareous and have regular menstrual cycle. Each female performed balance test two times one at the follicular phase and the other at the luteal phase of the menstrual cycle. The results showed a statistically highly significant decrease in stablilty indices during menstruation at first five days of follicular phase compared to luteal phase with p value < 0.0001,where the mean value of overall stability index at follicular phase was (2.3±0.6) and at the luteal phase was (1.58±0.38) ,the mean value of anterior/posterior stability index at follicular phase was (1.81±0.57) and at the luteal phase was (1.21±0.35) , and the mean value of medial/lateral stability index at follicular phase was (1.57±0.47) and at luteal phase was (1.16±0.32).Accordingly it could be concluded that postural balance is affected during follicular phase compared to luteal phase which may explain the increased liability to injury during this phase.