Summary
Researchers developed a new metric called "cardiovascular amplitude" that tracks HRV changes across the menstrual cycle, enabling non-invasive monitoring of hormonal fluctuations and reproductive health.
Methods
Development of cardiovascular amplitude metric from continuous wearable data
Key Findings
- HRV varies predictably across menstrual cycle phases
- Cardiovascular amplitude correlates with hormonal changes
- Irregular cycles associated with higher cardiovascular disease risk
- Non-invasive monitoring of female physiology possible
Limitations
New metric requires further validation
What This Means for You
For women, HRV naturally fluctuates with your menstrual cycle—typically higher in the follicular phase, lower in the luteal phase. Tracking these patterns can help you understand your body's rhythms and identify when something might be off.
Source
Read the original paper in npj Digital Medicine ↗
Added to HRV Zone: 2026-01-23