Wearable Sensors Reveal Menses-Driven Changes in Physiology and Enable Prediction of the Fertile Window: Observational Study

What this work gives Aellic

708 cycles: resting heart rate +3.96 bpm from the follicular to the late luteal phase. The luteal RESPIRATORY RATE swing, by contrast, is only +0.2 to +0.6 br/min and therefore BELOW the night-to-night precision of commercial sensors (~1.0 br/min) — which is why there is deliberately no cold-start offset for `respiratory_rate`, only the learned one.

Where this sits in the engine

2 declared sites: constants and thresholds in the code that point at this entry.

• Cycle Phases and cycle-aware baselines 2 sites