Vascular volume dynamics during ergometer exercise at different menstrual phases
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- Gaebelein, C.J. & Senay, L.C. Europ. J. Appl. Physiol. (1982) 50: 1. doi:10.1007/BF00952239
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Five female Caucasians performed cycle ergometer exercise in a hot environment (32‡ C dry bulb, 30‡ C wet bulb) both early in the follicular phase and in the middle of the luteal phase of the menstrual cycle. During each menstrual phase, the exercise was performed once following hyper-hydration and once after 24-h fluid deprivation. More rapid increases in hemoglobin concentration and osmoconcentration, as well as decreases in plasma volume, were observed during exercise in the follicular phase, more notably following hypohydration. The data suggest that the phase of the menstrual cycle as well as the preexercise fluid status of the subject may be important determinants of vascular volume dynamics during exercise.