Effect of different phases of menstrual cycle on peak expiratory flow rate

Introduction: Changes in the levels of various hormones during different phases of menstrual cycle are known to affect various functions of body apart from reproductive system. This study was planned to see effect of different phases of menstrual cycle on peak expiratory flow rate in normal healthy young females of age group between 18-24 years. Material & Method: Study was performed on 30 healthy normal regularly menstrual medical students of age group 18-24 years in different phases of menstrual cycle for single cycle. PEFR is recorded in different phases of menstrual cycle .menstrual phase(2nd to 4th day),proliferative phase(9th to 12th day)and luteal (19th to 21st day).Instrument used was WRIGHT’s peak expiratory flow meter. Three readings were taken in standing condition and maximum of three readings were considered in each phase. Results: Peak expiratory flow rate was significantly higher (p<0.05)during the luteal phase of menstrual cycle as compared to menstrual and proliferative phases. Conclusion: As PEFR was better during luteal phase so this suggests a possible role of increased levels of progesterone during the luteal phase on respiratory system.