Effects of ovarian hormones and oral contraceptive pills on cardiac vagal withdrawal at the onset of dynamic exercise

PloS One
André L TeixeiraDjalma R Ricardo

Abstract

The purpose of this study was to investigate the effects of the ovarian hormones and the use of oral contraceptive pills (OCP) on cardiac vagal withdrawal at the onset of dynamic exercise. Thirty physically active women aged 19-32 years were divided into two groups: OCP users (n = 17) and non-OCP users (n = 13). Participants were studied randomly at three different phases of the menstrual cycle: early follicular (day 3.6 ± 1.2; range 1-5), ovulatory (day 14.3 ± 0.8; range 13-16) and midluteal (day 21.3 ± 0.8; range 20-24), according to endogenous (in non-OCP users) or exogenous (in OCP users) estradiol and progesterone variations. The cardiac vagal withdrawal was represented by the cardiac vagal index (CVI), which was obtained by the 4-s exercise test. Additionally, resting heart rate, systolic (SBP) and diastolic blood pressure (DBP) were obtained. The CVI was not significantly different between the three phases of the menstrual cycle in either the non-OCP users (early follicular: 1.58 ± 0.1; ovulatory: 1.56 ± 0.1; midluteal: 1.58 ± 0.1, P > 0.05) or OCP users (early follicular: 1.47 ± 0.1; ovulatory: 1.49 ± 0.1; midluteal: 1.47 ± 0.1, P > 0.05) (mean ± SEM). Resting cardiovascular responses were not affected by hormonal phase...Continue Reading

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Citations

Sep 4, 2015·Psychophysiology·André L TeixeiraDjalma R Ricardo
Nov 15, 2017·Medicine and Science in Sports and Exercise·André L TeixeiraLauro C Vianna
Jan 20, 2018·American Journal of Physiology. Heart and Circulatory Physiology·André L TeixeiraLauro C Vianna
Jan 4, 2021·European Journal of Applied Physiology·Beatriz RaelUNKNOWN IronFEMME Study Group

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