A resting pulse can change with training, sleep, illness, medicines and measurement conditions. Tracking it may help you notice a pattern. It cannot on its own certify that your heart is healthy or that you have become biologically younger.
Accuracy depends on what was tested
A laboratory wearable study found that many tested devices measured heart rate more accurately than calorie expenditure. The devices and activities were specific, and the study did not validate every current model or establish diagnostic ability for every heart condition. A watch reading is not automatically equivalent to a medical assessment.
Medicines and clinical conditions can alter pulse responses. A fit person may have a lower resting pulse, but a low number accompanied by dizziness or other symptoms is not a fitness prize. Likewise, a high reading after poor sleep does not establish a disease or justify changing prescribed medication.
Measure calmly and respond to symptoms
If tracking is useful, compare readings under similar resting conditions rather than testing repeatedly throughout a stressful day. Discuss persistent unexpected changes or palpitations with a clinician. Chest pain, collapse or severe breathlessness requires urgent help, whatever the watch score says.
- Keep timing and resting conditions similar.
- Record illness or medicine changes.
- Avoid judging a single isolated reading.
- Prioritise symptoms and clinical advice.
Zhen can help set a practical fitness goal, such as a more comfortable walk or improved everyday stamina. WHO activity guidance supports regular movement, not the lowest achievable pulse. Progress should be interpreted across capability, symptoms and appropriate medical information rather than one wearable number.
Putting this into practice at Zhen
At Zhen Wellness in Onchan, Isle of Man, we help you turn health information into realistic next steps. The £97 Longevity MOT is a standalone 60-minute assessment of your history, priorities, posture, mobility and body composition estimates, with pain mapping where relevant. It is not a biological-age blood test, medical diagnosis or prediction of lifespan. Any further service is chosen separately around your needs, with costs discussed before you decide.
Research and safety
Sources checked on 14 October 2026. Studies describe their own participants and interventions, not Zhen treatment outcomes. Evidence can change; research is not free of bias. This article is general education, not individual medical advice. Adult fasting or exercise protocols are not suitable instructions for children. Seek appropriate clinical advice for new symptoms, medical conditions, pregnancy or treatment changes. Never stop prescribed medicines to follow a wellness plan.