Modern fertility awareness methods: wrist wearables capture the changes in temperature associated with the menstrual cycle

Shilaih, Goodale, Falco, Kübler, De Clerck, Leeners · 2018 · Bioscience Reports 38(6):BSR20171279

What this work gives Aellic

Wrist skin temperature: luteal rise +0.33 °C; a sustained 3-day shift occurs in 82 % of cycles, and 86 % of shifts begin on the day of ovulation or later. Carries three constants of the ovulation estimate at once: the 3-day rule (`TEMP_SHIFT_SUSTAIN_DAYS`), the choice of the day BEFORE the shift begins as ovulation, and the stratum boundary `> ovu_day`.

Correction of 26 July 2026

This paper was cited at four places in the cycle engine but was missing from the registry entirely — it is NOT identical with shilaih2017 (different year, different journal, different signal: temperature instead of pulse).

The entry on the register was wrong. It was not replaced but kept, with what holds instead standing next to it.

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

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