A Novel method for quantifying fluctuations in wearable derived daily cardiovascular parameters across the menstrual cycle

What this work gives Aellic

n = 11,590: only 80.6 % of women show the expected RMSSD amplitude across the cycle. A fixed offset would impose a pattern on one woman in five that she does not have — THE load-bearing argument for a per-person learned offset instead of a constant from the literature. It also supplies the shape that the two-strata model deliberately simplifies: resting heart rate has its minimum on cycle day 5 and its maximum only on day 26, so it rises during the fertile window already, rather than jumping after ovulation.

Where this sits in the engine

4 declared sites — constants and thresholds in the code that point at this entry.

• Cycle Phases and cycle-aware baselines 4 sites