Your resting heart rate is not static across the month. In people who menstruate, it follows a predictable rhythm tied to the menstrual cycle: lowest around menstruation, rising after ovulation, and peaking in the luteal phase before dropping again with the next period. The swing is modest, often just a couple of beats per minute, but it is consistent enough that researchers and wearable-tech companies now use it as a biological signal for cycle tracking and fertility prediction.
The General Pattern Across the Cycle
The menstrual cycle divides roughly into two halves. The first half, from the start of your period through ovulation, is called the follicular phase. The second half, from ovulation to the start of your next period, is the luteal phase. Heart rate tends to sit at its lowest during menstruation and the early follicular phase, then climbs after ovulation and stays elevated through the mid- and late-luteal phases.
A study using Oura Ring data in healthy women found that nocturnal heart rate during the midluteal and late luteal phases was significantly higher than during menses, while heart rate around ovulation remained low and comparable to the menstrual phase.1International Journal of Women’s Health. Tracking Sleep, Temperature, Heart Rate, and Daily Symptoms Across the Menstrual Cycle with the Oura Ring in Healthy Women Another study that tracked basal body temperature and heart rate together reported that heart rate in the fertile window was about 0.6 beats per minute higher than in the preceding stage, then jumped by a further 1.8 bpm once the luteal phase was fully underway.2PubMed Central. Tracking of menstrual cycles and prediction of the fertile window via measurements of basal body temperature and heart rate as well as machine-learning algorithms A wearable-based study quantifying the full swing found that naturally cycling women showed an average resting heart rate amplitude of about 2.7 bpm across the cycle.3npj Digital Medicine. A Novel method for quantifying fluctuations in wearable derived daily cardiovascular parameters across the menstrual cycle
So the change is real, but it is not dramatic. For most people, it amounts to a rise of roughly two to three beats per minute from the low point in the early follicular phase to the peak in the luteal phase. If your resting heart rate normally sits around 62, you might see it drift toward 64 or 65 in the week before your period, then settle back down as bleeding starts.
Why Heart Rate Climbs After Ovulation
The primary driver is progesterone. After ovulation, the corpus luteum (the structure left behind by the released egg) produces a surge of progesterone. Progesterone has a thermogenic effect, meaning it raises your core body temperature by roughly half a degree. That temperature increase demands more cardiovascular work: your heart speeds up slightly to help dissipate heat. One study specifically noted that the increase in resting pulse rate during the premenstrual phase likely results from increased circulating blood volume due to fluid retention as well as the thermogenic action of progesterone.4PubMed Central. Effect of female sex hormones on cardiorespiratory parameters
Estrogen plays a role too, though its influence is more nuanced. Estrogen tends to promote parasympathetic (calming, rest-and-digest) nervous system activity, which keeps heart rate lower. During the follicular phase, rising estrogen levels help maintain that lower resting rate. After ovulation, even though estrogen does not vanish, progesterone’s effects dominate. Research has found that both heart rate and breathing rate increase across the cycle, while heart rate variability decreases, and this decrease appears driven by parasympathetic withdrawal.5PubMed. Changes in resting heart rate variability across the menstrual cycle In other words, your body’s “brake pedal” on heart rate eases off as progesterone rises.
The Autonomic Nervous System Shift
To understand the heart rate change a little more precisely, it helps to know that your heart rate is constantly being tuned by two competing branches of the autonomic nervous system. The parasympathetic branch slows your heart; the sympathetic branch speeds it up. The balance between these two shifts across the menstrual cycle.
During the follicular phase, parasympathetic tone tends to be higher, and the baroreflex, which is a feedback loop that adjusts heart rate in response to blood pressure changes, is more sensitive. Research in young women found that baroreflex sensitivity was greater during certain parts of the follicular phase, and that estrogen levels correlated with this enhanced sensitivity.6PubMed. Influence of menstrual cycle on baroreflex control of heart rate: comparison with male volunteers Separately, a study in Circulation reported that sympathetic baroreflex sensitivity was significantly greater during the midluteal phase than the early follicular phase, indicating that the nervous system recalibrates as hormone levels shift.7PubMed. Influence of the menstrual cycle on sympathetic activity, baroreflex sensitivity, and vascular transduction in young women
A related review of baroreflex function in females confirmed that the sensitivity of this heart rate control mechanism fluctuates during the reproductive cycle, reaching a peak when gonadal hormone levels increase.8PubMed Central. Baroreflex function in females: changes with the reproductive cycle and pregnancy These fluctuations help explain why heart rate variability, often treated as a window into autonomic balance, follows a cyclical pattern that mirrors hormone changes. A study comparing the menstrual and secretory (luteal) phases found statistically significant differences in both mean heart rate and the frequency-domain components of heart rate variability between these phases.9PubMed Central. Effect of Different Phases of Menstrual Cycle on Heart Rate Variability (HRV)
The practical upshot: during the luteal phase, your nervous system is tilted slightly toward “fight or flight” mode relative to the early part of your cycle. Your heart rate is a little higher, your heart rate variability is a little lower, and your cardiovascular system is working marginally harder at rest.
What This Means for Exercise
If your resting heart rate is already slightly elevated in the luteal phase, that baseline shift carries over into exercise. A review in Sports Medicine noted that while most research suggests oxygen consumption and heart rate responses to light exercise are not strongly affected by the menstrual cycle, several studies report higher cardiovascular strain during moderate exercise in the midluteal phase, with potential negative effects on prolonged exercise performance through elevated body temperature.10PubMed. Effects of the menstrual cycle on exercise performance
For recreational exercisers, this might show up as a workout feeling slightly harder than usual during the second half of the cycle even when your pace or effort has not changed. Heart rate monitors may show you hitting higher zones for the same intensity. A study of female football players found that increased cardiovascular load and heart rate during the luteal phase made it harder for athletes to reach higher heart rate zones during submaximal exercise, and they spent more time in elevated zones during the early luteal phase.11medRxiv. Associations Between Menstrual Cycle Phases and Heart Rate, Well-Being, and Perceived Exertion in Female Football Players
This does not mean your performance is doomed during the luteal phase. The effect sizes are small, and individual variation is huge. But if you track heart rate zones closely, it is worth knowing that your numbers in the second half of your cycle may not be directly comparable to the first half. Adjusting training expectations slightly, or at least interpreting the data with cycle phase in mind, can prevent unnecessary frustration about a perceived fitness drop that is really just physiology.
A narrative review in Seminars in Reproductive Medicine highlighted that wearable technology offers a promising avenue for tracking menstrual cycles and optimizing athletic training and recovery, since wearables can monitor biometrics that correlate with hormonal fluctuations and help inform personalized training schedules.12PubMed. How the Menstrual Cycle Can Be Utilized During Sports Training, Performance, and Recovery through Wearable Technology: A Narrative Review for Researchers, Physicians, Coaches, and Athletes
How Hormonal Contraception Changes the Pattern
If you use hormonal birth control, the heart rate rhythm across your cycle looks very different. Combined oral contraceptives supply synthetic versions of estrogen and progesterone on a fixed schedule, which suppresses ovulation and flattens the natural hormonal peaks and valleys. The result is a much smaller or effectively absent heart rate fluctuation across the month.
One wearable-based study compared naturally cycling women with those on birth control pills and found a stark difference: naturally cycling participants had a mean resting heart rate amplitude of about 2.7 bpm, while pill users showed an amplitude of only about 0.3 bpm. The difference was highly significant.3npj Digital Medicine. A Novel method for quantifying fluctuations in wearable derived daily cardiovascular parameters across the menstrual cycle In practical terms, pill users’ resting heart rate barely budged across the month.
The pattern in pill users is not entirely flat, though. Research published in BMJ found that among oral contraceptive users, resting heart rate starts low during the first few days of the withdrawal bleed (the inactive pill week), quickly rises in the later days of the bleed week, then slowly decreases across the three weeks of active pill use.13BMJ. Patterns of endogenous and exogenous ovarian hormone modulation on recovery metrics across the menstrual cycle This creates a different and much subtler curve that is essentially the mirror of what happens in a natural cycle, with the peak arriving earlier and the trajectory reversed during the active pill weeks.
A review of studies on endogenous and exogenous estrogens and heart rate variability found that the intake of oral contraceptives appeared not to substantially alter vagal modulation of the heart, suggesting that while the heart rate rhythm flattens, the deeper autonomic balance may not shift as dramatically on the pill as you would expect from the hormone suppression alone.14Taylor & Francis Online (Climacteric). Impact of endo- and exogenous estrogens on heart rate variability in women: a review This is an area where the evidence gets thin and somewhat contradictory, partly because hormonal contraceptives come in many formulations with varying doses and progestin types.
Metabolism and Other Changes That Travel With Heart Rate
The heart rate shift in the luteal phase does not happen in isolation. It arrives alongside a constellation of other metabolic changes. Resting metabolic rate also increases during the luteal phase. A systematic review and meta-analysis found a small but significant increase in resting metabolism during the luteal phase compared to the follicular phase.15PubMed Central. Effect of menstrual cycle on resting metabolism: A systematic review and meta-analysis This tracks with the overall picture: your body is running a little hotter, your heart is beating a little faster, and your metabolism is burning a little more fuel. Together, these create a subtle but measurable increase in baseline physiological demand.
Core body temperature, as mentioned, rises after ovulation and remains elevated through the luteal phase. This is the same principle behind the basal body temperature method of fertility tracking: a sustained temperature rise after ovulation signals that progesterone is in play. The parallel rise in heart rate is essentially the cardiovascular system’s response to that same hormonal and thermal shift, which is why wearable devices now incorporate heart rate alongside temperature to improve cycle-phase detection.
Caffeine Responses Vary by Cycle Phase
One underappreciated wrinkle is that even your body’s response to common substances like caffeine shifts across the cycle. A study in post-pubertal girls found differences in caffeine’s cardiovascular effects depending on cycle phase: heart rate decreases from caffeine were greater during the midluteal phase, while blood pressure increases were greater during the midfollicular phase.16PubMed Central. Cardiovascular responses to caffeine by gender and pubertal stage The study was in adolescents, so the exact magnitude may differ in adults, but the finding illustrates how the hormonal milieu of each cycle phase alters the way your cardiovascular system responds to everyday inputs.
This matters if you are trying to interpret your resting heart rate data day to day. A cup of coffee in the midluteal phase might push your heart rate differently than the same cup during your period. Stress, sleep quality, alcohol, and hydration all interact with the cycle too. If you are tracking resting heart rate with a wearable and wondering why it spikes or dips on certain days, cycle phase is one variable, but it is not the only one, and these inputs can compound or mask the hormonal effect.
Approaching Menopause and Beyond
The cyclical heart rate pattern depends on regular ovulatory cycles. As you approach perimenopause, cycles become irregular, and the neat follicular-to-luteal rhythm starts to break down. Hormone levels fluctuate unpredictably, and the autonomic nervous system gradually shifts. A review of studies found that all investigations agreed on a decline in heart rate variability toward higher sympathetic (fight-or-flight) control after menopause.14Taylor & Francis Online (Climacteric). Impact of endo- and exogenous estrogens on heart rate variability in women: a review
This shift means that postmenopausal women tend to have lower heart rate variability and a more sympathetically dominated cardiovascular profile than premenopausal women. Ovarian hormones appear to play an important role in autonomic control of heart rate, and their reduction causes an autonomic imbalance that is associated with increased cardiovascular disease risk.17PubMed Central. Autonomic Cardiovascular Damage during Post-menopause: the Role of Physical Training This is one reason cardiovascular risk rises after menopause, and it underscores that the cyclical heart rate fluctuations of the reproductive years are not just a curiosity. They reflect an underlying hormonal support system for cardiovascular regulation that is gradually withdrawn.
During perimenopause, you might notice your resting heart rate pattern becoming less predictable, with some months showing the familiar rise-and-fall and others looking erratic. Wearable-based cycle tracking becomes less reliable in this phase precisely because the physiological signals it depends on, including heart rate, are no longer consistently tied to a regular hormonal cycle. If you have been using resting heart rate trends to track your cycle, a sudden loss of the expected pattern in your 40s could itself be a signal that perimenopause is underway.
When a Heart Rate Change Is Not Just the Cycle
Because a few beats per minute of variation is normal across the cycle, it can be hard to distinguish hormonal heart rate changes from something that actually needs attention. A sustained resting heart rate increase that persists well beyond when your period should have brought it back down, or a jump significantly larger than your usual luteal-phase rise, deserves a closer look. Conditions like thyroid disorders, anemia, and dehydration can all raise resting heart rate and may happen to coincide with the luteal phase, creating the impression that the cycle is to blame.
Pregnancy is another possibility. In early pregnancy, resting heart rate begins to climb as blood volume expands, and the rise may initially look similar to a long luteal phase. If your heart rate stays elevated past the expected start of your period and your period does not arrive, pregnancy is a plausible explanation. The cardiovascular changes of pregnancy ramp up considerably from there, but in those first few weeks, the signal can be ambiguous.
Polycystic ovary syndrome (PCOS) is associated with altered heart rate variability patterns, and because PCOS often involves irregular or absent ovulation, the expected cyclical rhythm in resting heart rate may be muted or absent. If you notice that your heart rate data never shows the characteristic rise and fall even though you are not on hormonal contraception, and you have other symptoms like irregular periods or signs of androgen excess, it is worth discussing with a doctor.
Ultimately, the cyclical pattern in resting heart rate is a normal feature of reproductive physiology. Knowing it exists helps you interpret wearable data more accurately, set more realistic expectations for exercise performance across the month, and recognize when a change falls outside the usual range. The two-to-three-beat-per-minute swing is not a problem to solve; it is your cardiovascular system responding to the same hormonal shifts that regulate the rest of your cycle.