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Heart Rate Variability Cycle

Meaning

Heart Rate Variability Cycle describes the predictable, phase-dependent changes in the beat-to-beat variation in heart rhythm (HRV) that occur across the female ovulatory cycle, reflecting the continuous modulation of the autonomic nervous system (ANS) by fluctuating sex hormones. This cyclical pattern typically shows a relative increase in parasympathetic tone, and thus higher HRV, during the follicular phase, followed by a decrease in HRV during the progesterone-dominant luteal phase. Tracking this cycle offers a non-invasive digital biomarker for assessing hormonal status and systemic stress adaptation.