Does HRV change with your menstrual cycle?
Yes, a little. In women with natural cycles, HRV tends to be higher early in the cycle and lower toward the end, by about 3 to 9 percent. Hormonal birth control goes with lower HRV, especially late in the cycle. Compare like with like.
A dip in the days before a period can look like overtraining or a cold coming. Often it’s the cycle. The fix is to compare this week with the same week of your last cycle, not with last week.
For scale: on an HRV of 40 ms, close to the 39.1 ms average for women on Oura, 3 to 9 percent is about 1 to 4 ms. That’s about the gap between a night with one drink more than usual and a night with one less, which was 3.8 ms for women in a study of 20,968 WHOOP members. So the cycle is a real effect, and a small one.
What we’d do: log your cycle next to your HRV. Expect a small slide in the late phase. Treat a drop that’s bigger than usual for that phase, or that comes with feeling unwell, as a sign of something else.
What the studies show
| Study | Who | Finding |
|---|---|---|
| A living review of 16 studies, 2026 | Women wearing HRV devices | HRV higher at the start of the cycle and lower toward the end, by 3 to 9 percent. Lower on hormonal contraception, especially late in the cycle. A decline after menopause, with age. Evidence moderate |
| 1.2 million days, 2026 | 2,596 women, 42,759 cycles | Cycle length was strongly linked to how much heart and breathing measures swung across the cycle. Sleeping less raised resting heart rate in every phase |
The studies in the review defined cycle phases in different ways, which made them hard to pool.
After menopause
HRV tended to fall after menopause, along with the usual fall with age. That’s a slow change over years. A sudden drop over a week or two is usually about something else, such as drinks, sleep, training or illness.
4 sources
- de Jager E et al., Wearable-derived heart rate variability across the menstrual cycle, hormonal contraceptive use, and reproductive life stages in females: a living systematic review, Sports Medicine, 2026pubmed.ncbi.nlm.nih.gov
- Gonzalez A et al., The menstrual cycle through the lens of a wearable device, npj Digital Medicine, 2026pubmed.ncbi.nlm.nih.gov
- Oura, What is the average HRV, updated 2026-09-16ouraring.com
- Grosicki GJ et al., Real-world effects of alcohol on heart rate, sleep, and physical activity by age and sex, PLOS Digital Health, 2026pubmed.ncbi.nlm.nih.gov
