The Effects of Menstrual Cycle Different Phases on Some Physiological Factors (Heart Rate, Blood Pressure, VO2max and Anaerobic Power) in Athlete Females

The purpose of this study was to examine the influence of menstrual cycle phases on some physiological factors (heart rate, systolic and diastolic tension, Vo2max and anaerobic power) of athlete females. Fifteen athlete females (age: 21.73±1.49 y, weight: 58.03±5.99 kg, height: 1.61±0./04 m, Mean±SD) with regular menstrual cycles (25-35 days) and no oral contraceptive use within the previous six month participated in this study. Menstrual cycle phases [early follicular (EF), late follicular (LF), and midluteal (ML)] verify with method of serum estrogen and progesterone concentration measurements. Ryming-Astrand sub-maximal test and RAST test used to estimate VO2max and anaerobic power respectively. One way repeated measures ANOVA and bonferroni post hoc test (α ≤ 0.05) applied for statistical analysis. Results indicated that heart rate in the ML phase is significantly higher than in the EF and LF. During LF phase, rest systolic tension and VO2max significantly increased. There was also significant decrease in maximal power and fatigue index in ML phase, whereas there were no significant differences in rest diastolic tension, mean and minimal anaerobic power between three different phases of menstrual cycle. Results indicated that menstrual cycle phases affects on some physiological factors of athlete females