The impact of menstrual cycle phase on cardiac autonomic regulation

Authors


  • This study was supported by 5 R01 HL072057 (R. P. Sloan, PI) from the National Heart Lung and Blood Institute, Inverness Medical, Inc., and the Nathaniel Wharton Fund.

Address reprint requests to: Paula S. McKinley, Behavioral Medicine Program, Department of Psychiatry, Columbia University, 1150 St. Nicholas Ave., Suite 121, New York, NY 10032, USA. E-mail: pm491@columbia.edu

Abstract

This study investigated menstrual cycle phase differences in heart rate (HR) and RR interval variability (RRV) in 49 healthy, premenopausal, eumenorrheic women (age 30.2±6.2 years). HR and RRV were computed from ambulatory 24-h electrocardiogram, collected for up to 6 days, with at least 1 day each during early to midfollicular and midluteal menstrual phases. Phase effects on HR and RRV were assessed using linear mixed effects models with a random intercept to account for the correlation of observations within each subject as well as intrasubject variation. During follicular phase monitoring, women had significantly lower average HR (−2.33 bpm), and higher standard deviation, the root mean squared successive difference, and high frequency (0.04–0.15 Hz) and low frequency (0.15–0.40 Hz) RRV than during the luteal phase. These results provide strong support for the influence of menstrual phase on cardiac autonomic regulation in premenopausal women.

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