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Learn more about chronobiology, defined as the branch of biology concerned with cyclical physiology.

Read about the observational cohort study that became the basis for rhythmo.me: Multiday cycles of heart rate are associated with seizure likelihood.

Learn more about the animal cycles that inspired the heart rate chronotypes:

1. Worker honeybee: 7-day cycle influence on fatty acid production
2. Butterfly: 2-week life cycle
3. Clownfish: 29.5-day reproductive cycle, aligning with tidal activity
4. Elephant: 13-18-week reproductive cycle
5. Turtle: annual and multiannual reproductive cycles