Abstract
HRV analysis has gained much importance in recent years, as a technique employed to explore the activity of autonomic nervous system (ANS), and as an important early marker for identifying different pathological conditions. Autonomic nervous activities fluctuate during the menstrual cycle. The aim of the present study was to compare and evaluate the changes in the ANS activity measured by the frequency domain analysis during different phases of menstrual cycle. The subjects consisted of 50 healthy female students aged 18-22 years who had regular menstrual cycles. The electrocardiogram (ECG) recordings were taken during the different phases of the menstrual cycle. Heart rate variability (HRV) was analyzed by means of two main frequency components that is the low frequency (LF) and the high frequency (HF) components using appropriate software. Heart rate (HR) and blood pressure (BP) were also recorded. In the frequency domain analysis, the low frequency component (LF) was significantly higher (p
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