Understanding resting heart rate: what it can reveal about your health

Our heartbeat accompanies us continuously. While we notice it clearly during sport, at rest the heart usually works so unobtrusively that we hardly pay attention to it. Yet the resting heart rate in particular can provide interesting clues about how the cardiovascular system is regulated and how physical exertion, fitness, stress or certain illnesses affect the body.

A single measurement only tells a small part of the story, however. Resting heart rate is neither a simple measure of health nor a kind of personal ‘longevity score’. It becomes more informative when observed over a longer period and changes are considered in the context of an individual’s trends.

Contents

1. What is resting heart rate and how does it arise?
2. What resting heart rate is considered normal?
3. What can resting heart rate reveal about health?
4. Why a low resting heart rate is not automatically better
5. Which factors influence resting heart rate?
6. Resting heart rate and physical fitness
7. What stress does to resting heart rate
8. What does resting heart rate tell us about ageing processes?
9. Measuring resting heart rate correctly and recognising changes
10. When a change in resting heart rate should be medically assessed
11. What can we learn from resting heart rate in everyday life?
12. Conclusion: resting heart rate is a signal, not a verdict
13. References

What is resting heart rate and how does it arise?

Resting heart rate refers to the number of heartbeats per minute when the body is in a relaxed state. Unlike during physical activity, the heart then only needs to move as much blood around the body as is necessary to supply the organs at that moment.

The rhythm originates in the sinus node, a small area in the heart’s right atrium. It acts as a natural pacemaker and generates electrical impulses that stimulate the heart muscle to contract. How quickly these impulses arise is influenced by, among other things, the autonomic nervous system.

Two opposing systems work together here: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system increases heart rate when the body needs to perform or react quickly. The parasympathetic nervous system, particularly through the vagus nerve, has a slowing effect. In a relaxed state, parasympathetic influence normally predominates, which is why heart rate is below the sinus node’s intrinsic rate.

This also means that resting heart rate is not simply a property of the heart. It arises from the interplay of the heart, nervous system, circulation, metabolism and external influences.

Why the heart does not always beat at the same speed

Even at rest, the heart does not beat at exactly the same speed like a metronome. Heart rate changes with breathing, for example. It typically rises slightly during inhalation and falls again during exhalation. This phenomenon is known as respiratory sinus arrhythmia and reflects dynamic regulation by the autonomic nervous system.

Time of day, body position and activity level also influence heart rate. For many people it falls at night, while temporarily rising on standing up. Changes in autonomic regulation and circulatory adjustment are among the factors responsible.

This dynamism is important when interpreting resting heart rate. A single value may be altered by numerous short-term factors.

What resting heart rate is considered normal?

For adults, a resting heart rate of approximately 60 to 100 beats per minute is often given as the normal clinical range. However, this does not mean that every value within that range is equally favourable or that every value below it is automatically particularly healthy.

Individual resting heart rate depends on, among other things, age, training status, genetic factors, medication and the autonomic nervous system. There can also be considerable differences between healthy people.

A value of, for example, 55 beats per minute may be entirely unremarkable in a well-trained person. In someone else, the same value together with dizziness, reduced performance or feelings of faintness may indicate a medically relevant disorder.

Why there is no perfect resting heart rate

The idea of an optimal resting heart rate is therefore problematic. Epidemiological studies do show that a higher resting heart rate may be statistically associated with less favourable health outcomes. However, this does not mean that deliberately lowering resting heart rate in healthy people automatically improves health.

A large meta-analysis of 46 prospective studies involving more than 1.2 million people examined the association between resting heart rate and all-cause mortality. For every ten-beat-per-minute increase in resting heart rate, the relative risk of all-cause mortality was higher. Similar associations were found for cardiovascular mortality. However, such data come predominantly from observational studies. They show an association, but do not prove that a higher resting heart rate itself causes the poorer prognosis.

This is a crucial distinction. An elevated resting heart rate may, for example, reflect a less favourable overall state of health. It can indicate physical inactivity, an acute illness or increased strain on the body. In this case, the pulse would be more of a marker than the actual cause.

What can resting heart rate reveal about health?

Resting heart rate is interesting because it reflects various physiological processes simultaneously. It provides an indirect insight into regulation of the cardiovascular system and can change when physical circumstances change.

What is particularly relevant is not only the absolute number, but also the individual trend.

If, for example, a person has a relatively stable resting heart rate of 58 to 62 beats per minute over several months and it suddenly remains at 70 or 75 for a prolonged period, the change may be more informative than the absolute number 70.

There are numerous possible causes. These include, among others:

• an infection or elevated body temperature
• dehydration
• psychological or physical stress
• sleep deprivation
• changes in physical activity
• certain medications or substances
• anaemia
• thyroid changes
• cardiovascular diseases

Persistent sinus tachycardia can occur, for example, in connection with fever, anaemia, hyperthyroidism or reduced blood volume. Medications and substances can also influence heart rate.

Resting heart rate can therefore be a reason to take a closer look. However, it does not replace medical diagnosis.

A single high value usually tells us little

If you record an unusually high value one morning, there is initially little to infer from it. Perhaps the night was restless, the body is responding to an emerging infection or the measurement was taken immediately after getting up.

It becomes more interesting if a change persists over several days or weeks or is accompanied by symptoms.

This also applies to a falling resting heart rate. A lower value can be a normal adaptation to regular endurance training. However, it may also have other causes, particularly if symptoms occur at the same time.

With resting heart rate, your personal baseline is often more important than a single measurement. Trends provide more information than snapshots.

Why a low resting heart rate is not automatically better

A low resting heart rate is often equated with good fitness. There is some truth to this connection, but it is too simplistic.

Regular training can lower resting heart rate. Endurance training in particular leads to adaptations in the cardiovascular system that allow the heart to manage with fewer beats per minute at rest. A systematic review and meta-analysis of 191 studies, or 215 samples studied, showed that various forms of physical activity can reduce resting heart rate. The effect was particularly pronounced with endurance training.

Resting heart rates well below 60 beats per minute are therefore not unusual in endurance athletes. Such sinus bradycardia may represent a physiological adaptation to intensive training. In well-trained people, the cardiovascular system can work very efficiently, while parasympathetic influence on the sinus node is pronounced.

However, this does not mean that ‘the lower, the better’ applies.

A very low pulse can also reflect a disorder of electrical impulse generation or conduction in certain people and under certain circumstances. What matters, therefore, is the combination of the measurement, personal context and any symptoms.

When a low pulse may warrant attention

A low resting heart rate deserves particular attention if it is new or associated with symptoms. These may include, for example, dizziness, unusual weakness, fainting, breathlessness or a markedly reduced capacity for exertion.

Interpreting the context is particularly important in athletes because a low pulse is often physiological in this group. At the same time, significant heart rhythm disorders can also occur in athletes. Current research shows that sinus node adaptations in people who train intensively are more complex than the traditional explanation based solely on increased vagal tone would suggest.

A low resting heart rate is therefore neither automatically a sign of exceptional fitness nor automatically a warning signal.

Which factors influence resting heart rate?

Resting heart rate is remarkably sensitive to changes in everyday life. This is precisely what makes it interesting, but also makes interpretation more difficult.

Sleep and recovery

During sleep, autonomic regulation changes. Parasympathetic influence typically increases and heart rate falls. This is why many people’s pulse is lower at night than during the day.

Conversely, poor nights, unfamiliar demands or psychological stress may be accompanied by changes in autonomic regulation. A persistently altered resting heart rate, together with other data, can therefore indicate that an individual’s level of strain has changed.

However, a single higher morning value should not be taken as evidence of ‘too much stress’. The relationship between subjective stress and cardiovascular measurements in everyday life is complex and considerably less clear in studies than under controlled laboratory conditions.

Fluid balance and acute illnesses

Fluid balance also plays a role. With reduced blood volume, the circulation must adjust its output. At the same time, fever and infections can increase heart rate.

An elevated resting heart rate during an acute illness is therefore not necessarily a separate heart problem. Rather, it may be part of the body’s normal response to the strain.

Medications and substances

Medications can also influence heart rate. Beta-blockers, for example, slow the effect of sympathetic signals on the heart and are used, among other things, to reduce heart rate. Other medications or substances, by contrast, can encourage an increase.

Caffeine is often mentioned as a possible reason for an elevated resting heart rate. However, a meta-analysis of randomised studies found no statistically significant rise in resting heart rate with daily consumption of three to six cups of coffee over two to 24 weeks. This shows why general statements about individual foods or drinks should be phrased cautiously.

Age and individual differences

Age also affects heart rate regulation. It changes not only resting heart rate itself, but also the responsiveness of the autonomic nervous system and circulation.

Comparisons across age groups are therefore useful only to a limited extent. More importantly, people of the same age can also differ considerably. Genetic factors, fitness, medications and lifestyle contribute to each person’s baseline.

Resting heart rate and physical fitness

The relationship between physical fitness and resting heart rate is one of the most readily understandable aspects of this topic.

With regular endurance training, the cardiovascular system adapts to the repeated exertion. Under certain conditions, a trained heart can achieve a larger stroke volume. Put simply, this means that more blood can be moved with each heartbeat. At rest, a lower heart rate may then be sufficient to supply the body with enough blood.

Autonomic regulation changes in parallel. For many people, resting heart rate falls over the course of a regular training programme.

A meta-analysis of controlled intervention studies involving 191 studies showed that physical training can reduce resting heart rate. However, the effects were not equally pronounced for every form of training. Endurance training and yoga in particular showed consistent effects in the analysis.

This makes resting heart rate an interesting accompanying measure of training progress. However, it should not be considered in isolation.

Why resting heart rate is not a fitness test

Two people can have the same resting heart rate and still have completely different physical capacities. Conversely, a fit person may have a higher resting heart rate than a less fit person.

Other parameters are therefore relevant to assessing cardiovascular performance, such as maximal oxygen uptake, the heart rate response to exertion or heart rate recovery after exertion.

Resting heart rate therefore provides a small part of a larger physiological picture.

What stress does to resting heart rate

The autonomic nervous system responds quickly to psychological and physical demands. When a situation is perceived as challenging, the sympathetic nervous system may be activated. Adrenaline and noradrenaline then support, among other things, a faster heart rate.

This is useful in the short term. The body is prepared to perform and react quickly.

Under sustained strain, the situation becomes more complex. Research on stress and cardiovascular responses shows that psychological stress can influence both sympathetic activation and changes in parasympathetic regulation.

Heart rate variability, or HRV, is particularly interesting here. It describes the differences in timing between successive heartbeats rather than average heart rate. Resting heart rate and HRV are related, but do not measure the same thing.

A low resting heart rate therefore does not automatically mean high HRV, nor does a high resting heart rate automatically mean low HRV.

Caution is also needed with HRV data. Measurements depend heavily on the measurement method, body position, breathing, time of day and analysis. A single HRV value should therefore not be interpreted as a direct diagnosis of ‘recovery’ or ‘stress’ either.

What does resting heart rate tell us about ageing processes?

This is where resting heart rate becomes particularly interesting, but also scientifically challenging.

A higher resting heart rate has repeatedly been linked to less favourable health outcomes in large observational studies. A meta-analysis of 46 prospective studies involving more than 1.2 million people, for example, found associations between a higher resting heart rate and increased all-cause and cardiovascular mortality. Another meta-analysis involving 20 prospective studies likewise found an association between higher resting heart rates and cardiovascular mortality.

A systematic review with a dose–response analysis also found positive associations between a higher resting heart rate and various health endpoints, including cardiovascular diseases and all-cause mortality.

At first, this sounds as though resting heart rate is a direct marker of biological ageing. However, the evidence is not that clear.

Marker or cause?

The crucial point is: A statistical association does not prove causation.

A higher resting heart rate may, for example, be associated with lower physical fitness, existing illnesses, inflammatory processes, medication use or other health factors. These factors may, in turn, be independently associated with health status and life expectancy.

Resting heart rate may therefore partly reflect how much strain various systems in the body are already under, without itself being the decisive trigger.

A recent review accordingly describes resting heart rate as a physiologically important parameter and prognostic marker, while emphasising that the mechanisms behind the observed associations in the general population are not fully understood. Above all, there is currently insufficient evidence that lowering resting heart rate in isolation in otherwise healthy people automatically leads to better health outcomes.

This is an important distinction for longevity research. A good biomarker is not necessarily a suitable treatment target.

Measuring resting heart rate correctly and recognising changes

For resting heart rate to be interpreted meaningfully at all, the measurement matters. Even small differences in timing, body position or preceding activity can change the value.

Measuring is particularly suitable in the morning after waking, before coffee, movement or other activities affect heart rate. Anyone wanting values that are as comparable as possible should record their pulse over several days under similar conditions.

The pulse can be felt manually at the wrist or neck. Alternatively, wearables such as smartwatches or fitness trackers measure it automatically. Such devices can certainly be helpful for observing trends. However, their accuracy depends on the device, measurement method and situation. Optical sensors can be more prone to errors during movement in particular.

What matters when measuring

A few simple rules can help make measurements as comparable as possible:

• measure at the same time of day where possible
• sit or lie quietly for a few minutes before measuring
• do not measure immediately after sport, climbing stairs or other exertion
• take caffeine and other stimulating substances before measurement into account
• do not overinterpret individual outliers
• look at changes over several days and weeks

Anyone who regularly records their resting heart rate develops a personal reference range. This is often more informative than comparison with a general average.

The trend matters more than the individual number

Suppose your resting heart rate remains relatively stable at 58 to 62 beats per minute over a prolonged period. If it rises to 70 or 75 within a few days, this may initially be an interesting signal.

It does not automatically mean that something is pathological. Such a rise may, for example, be associated with an infection, poorer sleep, unfamiliar exertion, psychological stress or changes in training volume.

If, on the other hand, the value gradually falls over the course of regular endurance training, this may reflect a normal training adaptation.

The key question is therefore less ‘Is my pulse good?’ and more: ‘How does my pulse normally behave, and what has changed?’

When a change in resting heart rate should be medically assessed

Resting heart rate is a measure to observe, not a diagnostic tool. An unusual value therefore does not initially mean that a disease is present.

Medical assessment is particularly worthwhile if a marked change is new, persists or is associated with symptoms.

This applies, for example, in cases of:

• recurrent dizziness
• fainting or near-fainting
• unusual breathlessness
• chest pain
• pronounced weakness
• markedly reduced capacity for physical exertion
• new episodes of a racing or fluttering heart
• a persistently unusually low or high resting heart rate

The combination of heart rate and symptoms is particularly important. A resting heart rate of 50 beats per minute may be entirely unremarkable in a trained person. However, if dizziness or fainting episodes occur at the same value, the medical interpretation changes fundamentally.

A persistently elevated resting heart rate should not simply be dismissed as a sign of ‘poor fitness’ either. Alongside physical inactivity, numerous other causes are possible, including acute illnesses, anaemia, thyroid changes or medications.

If severe symptoms such as chest pain, pronounced breathlessness or fainting occur suddenly, medical help should be sought rather than waiting for further pulse measurements.

What can we learn from resting heart rate in everyday life?

The greatest practical value of resting heart rate does not lie in aiming for a supposedly perfect number every morning. It makes more sense to view the value as a simple measure of change over time.

Anyone who regularly measures their resting heart rate can recognise changes in their own everyday life. This is particularly true when other information is considered at the same time.

For example: resting heart rate is normally around 60 beats per minute. After several days of little sleep, heavy work demands and substantially reduced training, it rises to 68. On its own, this value tells us little. Together with the changes in everyday life, however, it has a plausible context.

Conversely, a gradually falling resting heart rate during structured endurance training may indicate a cardiovascular adaptation.

Which measurements can complement one another

For a more comprehensive view of your health and fitness, other parameters may be interesting alongside resting heart rate:

None of these measurements can depict a person’s state of health on its own. Only the interplay of different information provides a more informative picture.

This also applies to so-called wearable data. A smartwatch can make changes visible, but it cannot explain why a value has changed.

Resting heart rate and longevity: what is actually known?

Longevity research often aims to identify biological markers associated with long-term health and ageing processes. Resting heart rate is interesting in this context because it is closely linked to regulation of the cardiovascular system and is relatively easy to measure.

Epidemiological research does indeed show an association between higher resting heart rate and various unfavourable health endpoints. This association has been described in several large observational studies and meta-analyses.

However, this does not establish that resting heart rate is a direct measurement of biological age.

The parameter is too non-specific for that. A higher resting heart rate can be influenced by numerous factors that are themselves associated with health status. These include fitness, medications, illnesses, physical exertion and autonomic regulation.

The idea of actively aiming for a particular resting heart rate is therefore also too simplistic. A low value may indeed result from a favourable training adaptation. However, it is not automatically an independent goal for healthy ageing.

One piece of the puzzle among many

Biological ageing involves numerous interconnected processes. These include changes in metabolism, mitochondrial function, inflammatory processes, vascular function and regulation of the autonomic nervous system.

Resting heart rate reflects only a small part of this.

For precisely this reason, it is more interesting as a context-dependent biomarker than as an isolated longevity value. It can make changes visible and provide a reason to look more closely. However, it cannot answer how biologically ‘old’ a body actually is.

This distinction matters because an easily measured value can quickly be used to derive a supposedly precise assessment of health. The scientific evidence does not support such an interpretation.

Conclusion: resting heart rate is a signal, not a verdict

Resting heart rate is one of the simplest measurements for observing cardiovascular function in everyday life. It arises through the interplay between the heart and the autonomic nervous system and responds to numerous internal and external influences.

A resting heart rate of approximately 60 to 100 beats per minute is often considered the normal clinical reference range in adults. At the same time, healthy people can have values well below this, particularly if they regularly do endurance training. A low value is therefore not automatically better than a higher one.

Of particular interest is the individual trend. Changes over a longer period can indicate that training status, strain, recovery or physical circumstances have changed. Resting heart rate should always be considered alongside other factors and any symptoms.

For longevity research, it is an interesting marker, but not a measure of biological age. Observational studies do show associations between a higher resting heart rate and less favourable health outcomes. Whether resting heart rate itself causes these developments or mainly reflects other processes cannot be established from this.

Anyone wanting to observe their resting heart rate therefore needs neither a perfect target value nor a daily assessment. Measuring regularly under comparable conditions and knowing your personal trend is usually more useful.

Resting heart rate therefore provides no simple answer to how healthy a person is. However, it can open a small, useful window onto the regulation of your own body.

References

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