The purpose of this study was to determine the exercise response to various stages of the menstrual cycle in young female African adults. Fifteen volunteer, sedentary young female adults with a regular 28-day menstrual cycle and no history of premenstrual syndrome or abnormality participated in this study. A repeated measure and three counter balanced cross over order design was used in data collection. The subjects engaged in a 20-metre shuttle run test (20-MST) at the 3rd (early follicular phase), 14th (ovulation) and 26th (late luteal phase) days of their menstrual 2 cycle. Maximal aerobic endurance performance indexes (VO₂ max, run time & number of exercise laps) were recorded. One way ANOVA with repeated measures was used in data analysis. 2 The result revealed no significant differences in the short maximum endurance performance (VO₂ max) [F=.554, p=0.581], run laps [F=.483, p=0.622], and run time [F=.554, p=0.581]) recorded in the various phases of the menstrual cycle at p