Summary
Five women were studied during exercise and passive heating to determine whether PV dynamics were affected by the menstrual cycle. The exercise bout (80% \(\dot V_{{\text{O}}_{\text{2}} } \) peak) on a modified cycle ergometer and the passive heat stress were done in a hot environment (Ta=50°C, Pw=1.61kPa) during the follicular and luteal phase. Esophageal temperature (Tes) was measured continuously. Blood samples were drawn after each 0.2° C increase in Tes and \(\dot V_{{\text{O}}_{\text{2}} } \) was measured at that time. Initial PV was estimated at rest during the follicular phase. PV changes from rest were calculated at each Tes from Hb and Hct. During passive heating, PV decreased by a mean volume of 156 (±80) ml to 2.83 (±0.09)l in the follicular phase. During the luteal phase, there was a larger volume reduction (300±100 ml) during passive heating, and the final PV was lower than in the follicular phase and averaged 2.47±0.181. During exercise, PV decreased 463 (±90) ml to 2.50 (±0.11) l in the follicular and 381 (±70) ml to 2.50 (±0.23) l in the luteal phase. These data indicate that there is a menstrual cycle effect on PV dynamics during passive heating such that more fluid is shifted out of the vasculature during the luteal phase. During severe exercise there is a greater fluid loss during the follicular phase, yet the final PV is not different between phases.
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Stephenson, L.A., Kolka, M.A. Plasma volume during heat stress and exercise in women. Europ. J. Appl. Physiol. 57, 373–381 (1988). https://doi.org/10.1007/BF00417979
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DOI: https://doi.org/10.1007/BF00417979