Short answer: resting heart rate is the number of times your heart beats per minute when you are awake, calm and physically at rest. Endurance training often lowers it, but no single number proves that an athlete is fit or that their heart is healthy.
For athletes, the most useful signal is usually a consistent change from a well-measured personal baseline. Illness, dehydration, poor sleep, heat, stimulants, alcohol, overreaching, medicines and heart-rhythm problems can all change the result.
Key takeaway: measure resting heart rate under repeatable conditions and follow the trend. A low or high number matters more when it is new, persistent or accompanied by symptoms.
Table of contents
- What resting heart rate tells you
- How athletes should measure it
- What is a normal resting heart rate?
- Low resting heart rate in athletes
- Why resting heart rate may rise
- Using trends for training and recovery
- How accurate are wearables?
- AAS, stimulants and enhanced athletes
- When to seek medical review
- Frequently asked questions
- References
What resting heart rate tells you
Resting heart rate reflects the interaction of the heart’s natural pacemaker, the autonomic nervous system, fitness, recovery, temperature, hydration, medicines and health conditions. It is easy to measure, but not specific enough to diagnose the cause of a change.
Regular aerobic training commonly lowers resting heart rate through adaptations that allow the heart to deliver blood efficiently and through increased parasympathetic activity. Strength-trained athletes may also have lower values, although the pattern varies.
How athletes should measure it
- Measure at the same time each day, preferably after waking and before caffeine or training.
- Lie or sit quietly for several minutes.
- Use the same position and device.
- Count a full 60 seconds if measuring your pulse manually, especially if the rhythm feels irregular.
- Record illness, alcohol, poor sleep, hard sessions, heat exposure and stimulant use.
- Look at a rolling trend rather than reacting to one reading.
A watch’s overnight or “resting” value may be calculated with a proprietary algorithm rather than a single standardised measurement. Compare like with like.
What is a normal resting heart rate?
Many adult references describe 60 to 100 beats per minute as a general resting range. Trained athletes can sit below 60 without disease. These are broad descriptions, not personalised clearance thresholds.
Age, fitness, genetics, body position, temperature and medicines all influence the number. A value that is normal for one athlete may be a meaningful change for another.
| Pattern | Possible interpretation | Next step |
|---|---|---|
| Stable low rate, no symptoms | May be a normal training adaptation | Continue routine monitoring |
| Sudden increase from baseline | Illness, fatigue, dehydration, stress or stimulant effect | Check context and repeat |
| Persistently high at true rest | Needs assessment for cause | Book a clinical review |
| Low rate with fainting or poor exercise tolerance | May be clinically important | Prompt medical assessment |
| Irregular pulse or recurrent palpitations | Possible rhythm disturbance | Clinical review and possible ECG monitoring |
Low resting heart rate in athletes
Bradycardia means a slower-than-usual heart rate, often defined in adults as below 60 beats per minute. In a well-trained, asymptomatic athlete it can be physiological.
The number should not be dismissed when there are symptoms such as fainting, near-fainting, unexplained dizziness, unusual fatigue, chest discomfort, breathlessness or reduced exercise capacity. Medicines including beta-blockers can also lower heart rate.
A very low rate while asleep is not interpreted in exactly the same way as the same rate while awake with symptoms. Context belongs in the assessment.
Why resting heart rate may rise
- fever or infection;
- dehydration and heat stress;
- poor sleep or untreated sleep apnoea;
- psychological stress or pain;
- alcohol;
- caffeine, nicotine, pre-workout stimulants or other drugs;
- heavy accumulated training load;
- anaemia, thyroid disease or other medical conditions;
- some medicines; and
- an arrhythmia.
A hard session can influence the next morning’s result, but a raised rate does not prove “overtraining”. Overtraining syndrome is a clinical diagnosis that requires a broader history and exclusion of other causes.
Using trends for training and recovery
A personal baseline collected over several normal weeks is more useful than a generic athlete chart. If resting heart rate rises alongside poor sleep, reduced performance, soreness or illness symptoms, reducing training load for the day may be sensible.
There is no universal increase that automatically requires rest. Device error and normal day-to-day variation are real. Use the trend as one input alongside session performance, perceived recovery and symptoms.
Heart-rate variability measures something different and is even more sensitive to device method and breathing. Neither metric should overrule obvious illness or concerning symptoms.
How accurate are wearables?
Optical wrist sensors can estimate heart rate reasonably well at rest for many people, but accuracy changes with movement, skin contact, device fit, rhythm, sensor design and activity type. A consumer watch is not equivalent to a diagnostic 12-lead ECG.
If a wearable repeatedly reports an unexpectedly high, low or irregular rate, confirm it manually and discuss it with a health professional. A clinician may use a resting ECG, Holter monitor or event recorder depending on how often symptoms occur.
AAS, stimulants and enhanced athletes
Resting heart rate is not a validated safety gauge for anabolic-androgenic steroid exposure. A normal pulse cannot exclude high blood pressure, adverse lipids, erythrocytosis, coronary disease or changes in heart structure.
Stimulant-containing pre-workouts, fat-loss drugs, nicotine and some performance-enhancing drugs can increase heart rate or provoke palpitations. Combining stimulants can make the response less predictable, particularly with dehydration, heat and intense exercise.
Track heart rate alongside properly measured blood pressure and the wider checks in the enhanced-athlete heart-health guide. No supplement can turn a concerning rhythm or persistent tachycardia into a safe finding.
When to seek medical review
Arrange medical review for a persistent unexplained change, recurrent palpitations, an irregular pulse, a very low awake heart rate with symptoms, or reduced exercise tolerance.
Seek urgent care for chest pressure or pain, fainting during exercise, severe breathlessness, a sustained rapid or irregular heartbeat with weakness, or symptoms of stroke. In Australia, call Triple Zero (000) in an emergency.
Frequently asked questions
What is resting heart rate?
It is the number of heartbeats per minute while you are awake, calm and physically at rest.
Is a resting heart rate below 60 normal for an athlete?
It can be a normal training adaptation when stable and symptom-free, but context matters.
What is too low for an athlete?
There is no single cut-off for everyone. A new low rate or one accompanied by fainting, dizziness or poor exercise tolerance needs assessment.
Why is my resting heart rate suddenly higher?
Common reasons include illness, dehydration, heat, alcohol, poor sleep, stress, stimulants and accumulated training fatigue.
Does a low resting heart rate prove I am fit?
No. Fitness can lower it, but medicines, rhythm problems and other conditions can also produce a low rate.
Can pre-workout increase resting heart rate?
Stimulants can raise heart rate and may contribute to palpitations, especially when combined.
Are smart watches accurate for heart rate?
They can be useful for trends at rest, but accuracy varies and they do not replace a clinical ECG.
Is resting heart rate enough to monitor AAS risk?
No. It does not assess blood pressure, lipids, blood count, heart structure or coronary disease.
When should an athlete get an ECG?
Symptoms, an irregular pulse, a concerning family history or a clinician’s risk assessment may justify ECG testing.
References and further reading
- Effects of exercise on resting heart rate: systematic review and meta-analysis
- Resting heart rate and mortality: meta-analysis
- Heart Foundation: heart arrhythmia and diagnostic tests
This article provides general education and cannot diagnose a heart-rhythm condition. Discuss persistent changes or symptoms with a qualified health professional.