Your heart isn't just pumping blood — it's broadcasting information about your hormones.
The rhythm behind the rhythm
Resting heart rate tends to rise gently in the luteal phase under progesterone's influence, and heart rate variability (HRV) — the tiny beat-to-beat differences that reflect nervous system balance — often dips before menstruation and rebounds afterward.
Why this matters for cycle tracking
These cardiovascular markers are continuous, effortless, and already proven in wearables. Combined with source-level signals like skin temperature and discharge patterns, they add context that temperature alone can't provide: stress load, recovery, and the physiological "mood" of your cycle.
Reading the whole orchestra
No single signal tells the full story. A temperature shift without a heart-rate echo could be an outlier. When five signals move together, confidence rises. That's the philosophy behind Femora — measure at the source, interpret as a system.
Welcome to the Femora Fam
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