The menstrual cycle is a complex physiological phenomenon . Although no changes happen before or during menstruation in some females, physical and physiological changes do happen in some females . Although some females feel a decrease in their physical capacity during menstrual cycle,Olympic medal-winning performances have taken place during all portions of the menstrual cycle .Oligomenorhea (irregular pattern) or amenorrhea (cessation extending beyond 90 days) could develop in the female athletes involved in high-intensity training. The exact cause of amenorrhea in female athletes is unknown. The reason of this disorder could be excessive weight loss, changes in body composition, insufficient nutrition, psychological stress, and intensive training .