Gordon D, et al. - The impact of menstrual cycle phase on maximal oxygen uptake (VO_2max) and associated cardiodynamic responses are investigated in this study. Information recommend that the VO₂-plateau is affected by monophasic oral contraceptive pill, furthermore this information implies that VO_2max test outcome is independent of menstrual cycle phase but caution ought to be applied when assessing maximal oxygen uptake in females who are administered a monophasic oral contraceptive pill.