Journal of Applied Physiology
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J Appl Physiol 67: 517-522, 1989;
8750-7587/89 $5.00
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Journal of Applied Physiology, Vol 67, Issue 2 517-522, Copyright © 1989 by American Physiological Society

ARTICLES

CO2 sensitivity changes during the menstrual cycle

K. Dutton, B. A. Blanksby and A. R. Morton
Department of Human Movement and Recreation Studies, University of Western Australia, Nedlands.

A study of the changes in CO2 sensitivity at rest was undertaken in 20 regularly menstruating females in an attempt to determine the influence of the menstrual cycle on this variable. A biphasic oral temperature graph was used to signify fertility and demarcate three phases of the cycle. A CO2-rebreathing test was conducted 3 times/wk for 6 wk to obtain CO2 sensitivity and CO2 threshold measures. An analysis of variance was used to compare the results collected in each phase of the cycle for each of the variables. A significant increase was found in the sensitivity to CO2 between the follicular and luteal phases, a significant decrease between the luteal and menstrual phases, and no significant difference between the follicular and menstrual phases. The change between follicular and luteal phases was attributed to the effect of progesterone, which is elevated during the luteal phase. No significant change was found in the CO2 threshold level.


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