الفهرس 
Effect of aerobic exercise on menstrual dysfunction in volleyball players
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Abstract
This study was conducted to evaluate the effect of replacing a part of the training regimen with low intensity aerobic exercise on menstrual function and bone mineral density (BMD) in volleyball players. Fortygirl{u2019}s (volleyball players) experiencing menstrual dysfunction were randomly distributed into two groups. The control group received deep breathing exercises, nutritional recommendation and medical treatment in the form of vitamin B6, Ca supplements and minerals once daily for 24weeks while, the study group received the same treatment, as well as replaced a part of the training with a program of low intensity aerobic exercise for 24 weeks. Serum estradiol, number of menstrual cycles in the last year, menstrual cycle length and BMD measurements were evaluated pre and post-treatment.Results: Control group showed non-significant difference in serum estradiol (P=0.457), number of menstrual cycles (P=0.678), menstrual cycle length (P=0.600), L1-2BMD (P=0.335) and right femoral neck (P=0.791) post-treatment. Study group showed significant increase in serum estradiol (P=0.003) and number of menstrual cycles (P=0.0001) and significant decrease in the menstrual length (P=0.0002), as well as non-significant difference in L1-2 BMD (P=0.094) and right femoral neck BMD (P=0.241) post-treatment. Compared to control group, the study group showed significant increase in the number of menstrual cycles (P=0.0003) and significant decrease in the menstrual length (P=0.0009), however non-significant difference in serum estradiol (P=0.312), L1-2 BMD(P=0.145) and right femoral neck (P=0.202).It can be concluded that replacing a part of training with a program of low intensity aerobic exercise, improved the number of menstrual cycles in the last year and with the menstrual cycles length in volleyball Players