[Hemodynamics and ergometric performance modified by low dosage oral contraceptives].

In this pilot study hemodynamic parameters under base-line and performance conditions during a cycle without (N) and with low-dosed oral contraceptives (OC) were of interest. A group of 6 women (age 23.2 +/- 2.1 years) underwent 8 bicycle ergometry sessions each in both a normal cycle and in a cycle on OC. Testing was done in 3 phases of each cycle. Data were obtained on the maximum watt performance, the pulse work capacity at a heart rate of 170 beats per minute (PWC170), as well as on blood pressure and heart rate at rest and at various levels of exercise. No significant differences were found between the N and OC cycles during the follicular phase or in mid-cycle. During the luteal phase, however, faster heart rates and higher blood pressure levels were found for N cycles than in the corresponding phase under OC (p < 0.05).