الفهرس 
Hormonal effect of different menstrual phases on dynamic balance in post pubertal females
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Abstract
Background: High rate of injuries detected during certain periods of menstrual cycle, raised the suggestion of the efficacy of female sex hormones on soft tissues and neuromuscular control with subsequent deterioration of postural stability and high injury prevalence in post pubertal females. Purpose: To investigate the effect of female sex hormones across different menstrual phases on dynamic postural stability in post pubertal females. Methods: Thirty-six postpubertal females participated in this study. They were selected from students and graduates of faculty of physical therapy, Deraya university, their ages ranged from 16 -25 years and their BMI ranged from 18-25kg/m2, they were assigned into one group. Level of serum estradiol and progesterone hormones were assessed, also timing of ovulation was detected by using urine luteinizing hormone ovulatory strip test. Biodex balance system was used to assess dynamic postural stability indexes. Measurements were taken at early follicular (1st-3rd) day after menstruation, ovulation (11th-13th) day from onset of menstruation and mid luteal phase (21th - 23th) day of the menstrual cycle. Results: There was a significant increase in overall, anteroposterior and mediolateral stability indexes as well as overall, anteroposterior and mediolateral sway indexes at ovulation phase in compared to early follicular and mid luteal phasesof menstrual cycle in postpubertal females (P<0.05), while there was non significance difference between the early follicular and the mid luteal phase (P>0.05) in all these variables. Conclusion: Hormonal changes occurred during different menstrual phases affect the dynamic postural stability performance in postpubertal females which should be taken into consideration during prescription of exercise training program especially during ovulatory phase