Amenorrheic athletes do not display signs of impaired autonomic function or orthostatic responses compared with eumenorrheic athletes during the follicular phase.
Cross-Sectional (n=35)
Do amenorrheic athletes have impaired autonomic cardiovascular regulation compared with eumenorrheic athletes?
Amenorrheic athletes do not exhibit impaired autonomic cardiovascular regulation or orthostatic responses compared to eumenorrheic athletes.
Reproductive hormones such as estradiol and progesterone are known to influence autonomic cardiovascular regulation. The purpose of this study was to determine whether amenorrheic athletes (AA) have impaired autonomic cardiovascular regulation compared with eumenorrheic athletes (EA). Thirty-five athletes were tested: 13 AA (19 +/- 1 yr), 13 EA (21 +/- 1 yr), and 9 EA (23 +/- 1 yr) on oral contraceptives (EA-OC). Multiple indexes of autonomic cardiovascular regulation were assessed: respiratory sinus arrhythmia (RSA), cardiovagal baroreflex sensitivity (BRS) via phase IV and phase II of the Valsalva maneuver, a spontaneous index of BRS, and the heart rate and blood pressure responses to orthostatic stress (20-min 60 degrees head-up tilt). RSA was not different among the groups. There were no group differences in the spontaneous index of BRS (AA = 30 +/- 6, EA = 24 +/- 3, EA-OC = 29 +/- 5 ms/mmHg) or in phase II (AA = 8 +/- 2, EA = 7 +/- 1, EA-OC = 8 +/- 1 ms/mmHg) of the Valsalva. There was a difference in BRS during phase IV (AA = 21 +/- 3, EA = 15 +/- 1, EA-OC = 26 +/- 6 ms/mmHg; ANOVA P = 0.04). Tukey's post hoc test indicated that BRS was greater in the EA-OC group compared with the EA group (P = 0.04). There were no differences in cardiovascular responses to orthostatic stress among the groups. In conclusion, AA do not display signs of impaired autonomic function and orthostatic responses compared with EA or EA-OC during the follicular phase of the menstrual cycle.
Wenner et al. (Fri,) conducted a cross-sectional in Amenorrhea (n=35). Amenorrhea vs. Eumenorrheic athletes (with or without oral contraceptives) was evaluated on Autonomic cardiovascular regulation (respiratory sinus arrhythmia, baroreflex sensitivity, and orthostatic responses). Amenorrheic athletes do not display signs of impaired autonomic function or orthostatic responses compared with eumenorrheic athletes during the follicular phase.