What's a normal HRV for women? Ranges by age, and why yours varies

What's a normal HRV for women? In a large lab study of healthy adults, women aged 25 to 34 averaged an RMSSD of about 43 ms on a 5-minute resting recording, falling to about 21 ms by 55 to 64. In a big smartphone dataset of morning readings, women averaged 68 ms. Both are "normal". The spread around each is huge, and the number depends heavily on how and when it's measured.

So the useful answer is: a normal HRV for women is the range that's normal for you, read against your own baseline and, if you have a natural cycle, against the same point in your previous cycles. Below are the published numbers by age, how women's HRV compares with men's, what your cycle does to it, and how to use it without letting your watch run your life. If you'd rather not interpret it daily, exrsz's adaptive plans adjust your training to how the previous week actually went.

HRV and the cycle overlap a lot, so the hub guide on how to workout with menstruation is the best companion to this post.

One ground rule: HRV here is a training-readiness signal, not a health test. If you're worried about your heart or your numbers, see a doctor.

What HRV measures, briefly

Heart rate variability is the beat-to-beat variation in the gap between heartbeats. Most watches and apps report a version of RMSSD in milliseconds. The parasympathetic, "rest and digest" branch of your nervous system slows heart rate and increases HRV; the sympathetic branch does the opposite. In large-scale morning data, hard training, heavy drinking, illness and the luteal phase of the cycle all pushed HRV down (Altini & Plews, 2021).

It's one input, not a verdict. It works best inside a plan that already has structure, such as a women's strength and running plan with hard days, easy days and planned lighter weeks.

Normal HRV for women by age

The cleanest published reference we found for women by decade comes from 1,906 healthy adults in Germany's population-based KORA S4 study. Each had a 5-minute ECG recorded lying down after 5 to 10 minutes of rest (Voss et al., 2015). Here's women's RMSSD by age:

Source: Voss et al., 2015, Table 5.

How to read it:

• ›The standard deviations are enormous. A 30-year-old woman at 20 ms or 65 ms is well within the normal spread. "Below average" here is not a diagnosis.
• ›It falls with age. The biggest step in this data came between the 35–44 and 45–54 groups (Voss et al., 2015).
• ›It's a lab number. Five minutes lying still on an ECG is not the same as an overnight average from a ring or a one-minute reading on your phone.

That last point matters. In a dataset of 28,175 smartphone app users taking a roughly one-minute reading on waking, 5,425 of them women, the women's average RMSSD was 68 ± 34 ms (Altini & Plews, 2021). Same metric name, different method, very different number. Compare your watch with your watch, never with a table built on someone else's method.

Age also nudges other numbers on your dashboard. VO2 max by age female explained shows the same downward slope for aerobic fitness, and the same lesson: compare yourself with people your age, or better, with yourself.

Do women have lower HRV than men?

Less than you'd think, and it depends on the measure.

• ›RMSSD is similar. In the Voss study, younger women (25–49) averaged 36.5 ms and younger men 34.0 ms, with no significant difference; the same was true for the older groups (Voss et al., 2015). In the smartphone data, RMSSD was 68 ms for women and 67 ms for men, a negligible difference (Altini & Plews, 2021).
• ›Resting heart rate is higher in women. The same app data put it at 61 bpm for women and 56 for men (Altini & Plews, 2021).
• ›Some measures differ, in both directions. A meta-analysis of 172 studies and 63,612 participants found women had a lower mean RR interval and SDNN and less total power, but greater high-frequency power. The authors' summary: despite a higher mean heart rate, women showed greater vagal activity by that measure.

Translation: don't let anyone tell you your HRV is "low because you're a woman". For the RMSSD number most watches show, sex explains almost nothing. In the smartphone data, sex, age, BMI and activity level together explained only about 15% of the variation in RMSSD between people (Altini & Plews, 2021).

HRV also doesn't settle the bigger question of do women have more endurance than men. That's a separate research topic with separate evidence.

How the menstrual cycle changes HRV

If you have a natural cycle, your HRV probably moves across it.

• ›It tends to dip in the luteal phase. A meta-analysis of 37 studies and 1,004 women found a significant decrease in vagally mediated HRV from the follicular to the luteal phase, with larger drops into the premenstrual days in the studies that compared finer-grained phases.
• ›In real life, it's small. In the app data, among 639 women who logged at least five cycles, RMSSD changed by about 3.2% between the follicular and luteal phases, and resting heart rate by about 1.6% (Altini & Plews, 2021).
• ›Resting heart rate rises after ovulation. In a study of 91 women wearing wrist sensors overnight, pulse rate in the mid-luteal phase averaged 3.8 beats per minute higher than during menstruation.

The hormones behind those shifts, and when each phase happens, are covered in menstrual cycle phases and hormones. The full story of heart rate menstrual cycle changes is a bigger topic than this section.

What it means for training: a small luteal dip is expected and isn't a recovery problem. If you only compared today with last week, you'd misread it every month. Compare the luteal phase with your previous luteal phases instead.

And on the practical question, should i workout on the first day of my period? If you feel fine, yes. A 2020 meta-analysis found at most a trivial performance dip in the early follicular phase, from mostly low-quality evidence. If cramps or fatigue make it rough, swap in something easier.

How women should use HRV in training

The same rules everyone should follow, plus one:

1. ›Measure the same way every time. Same device, same time (on waking or overnight), same position.
2. ›Build a baseline over a few weeks. That's your normal range.
3. ›Watch the 7-day trend, not single days. One low reading is noise. A week-long slide alongside poor sleep and heavy legs is signal.
4. ›Log your cycle next to it. That's the extra rule. It turns a confusing monthly wobble into an expected pattern.
5. ›Log the obvious confounders: alcohol, late meals, bad sleep, illness, travel. In the app data, high alcohol intake dropped HRV by about 12% and sickness by about 10%, both bigger than the cycle effect (Altini & Plews, 2021).

For the full method, including what to do with a sustained drop, what is a good hrv score explained covers baselines, rolling averages and when to adjust training.

HRV across a lifetime

HRV falls with age in both the lab data and the app data (Altini & Plews, 2021). That's not a training failure. The years around perimenopause bring their own training questions, and the case for lifting through them is in more on strength training for women over 40. Your HRV at 50 should be compared with your HRV at 49, not your HRV at 30.

How exrsz handles this

exrsz builds a periodized plan from your goal, schedule, level and equipment, with running and lifting balanced in one plan. It adapts each week to how you actually trained and reshuffles missed sessions, so a rough stretch leads to a sensible next week. It doesn't diagnose anything.

FAQ

What's a normal HRV for women?

It depends on age and measurement method. On 5-minute lab recordings, healthy women averaged about 43 ms RMSSD at 25–34 and about 21 ms at 55–64, with wide spreads (Voss et al., 2015). Your own baseline matters more than either.

Is HRV lower in women than men?

Not for RMSSD, in the big datasets. A smartphone study found 68 ms for women and 67 ms for men (Altini & Plews, 2021), though women had higher resting heart rates.

Why is my HRV lower before my period?

HRV tends to dip in the luteal phase. A meta-analysis of 37 studies found a significant decrease in vagally mediated HRV from the follicular to the luteal phase.

Does HRV decrease with age in women?

Yes. In one lab study, women's average RMSSD fell from about 43 ms at 25–34 to about 19 ms at 65–74 (Voss et al., 2015).

Should I skip training if my HRV is low?

Not for a single low reading, especially in your luteal phase. If your 7-day average stays below your normal range and you feel and perform worse, make the day easier. If it stays low for no clear reason or you feel unwell, see a doctor.