Why the study?
Does the menstrual cycle phase alter nonlinear properties of heart rate variability in healthy young women?
Does the menstrual cycle phase alter nonlinear properties of heart rate variability in healthy young women?
Nonlinear properties of heart rate variability are altered during the regular menstrual cycle, suggesting that autonomic nervous system activity, ovarian hormone balance, and free T4 are involved in nonlinear heart rate control.
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Menstrual phase may alter nonlinear HRV in healthy women; leaves open whether phase adjustment is needed in autonomic assessments.
Bai et al. (2009) studied this question.
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