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Heart Rate: Normal Values, Causes and Measurement

Heart rate indicates how many times the heart beats per minute. It is a key vital sign that provides important information about cardiovascular health and overall wellbeing.

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Things worth knowing about "Heart Rate"

Heart rate indicates how many times the heart beats per minute. It is a key vital sign that provides important information about cardiovascular health and overall wellbeing.

What Is Heart Rate?

The heart rate refers to the number of times the heart beats per minute (bpm). It is one of the most fundamental vital signs used in clinical practice and everyday health monitoring. In healthy adults at rest, a normal heart rate falls between 60 and 100 beats per minute.

Normal Heart Rate Values

What is considered a normal heart rate varies depending on age, fitness level, and circumstances:

Newborns: 120 to 160 beats per minute
Toddlers (1-3 years): 90 to 150 beats per minute
Children (6-12 years): 70 to 110 beats per minute
Adults: 60 to 100 beats per minute
Trained athletes: May fall below 40 beats per minute

Causes of an Elevated Heart Rate (Tachycardia)

A heart rate exceeding 100 beats per minute in adults is called tachycardia. Common causes include:

Physical exertion or exercise
Stress, anxiety, or emotional excitement
Fever or infections
Overactive thyroid gland (hyperthyroidism)
Cardiac arrhythmias
Anemia
Certain medications or stimulants such as caffeine

Causes of a Low Heart Rate (Bradycardia)

A heart rate below 60 beats per minute in adults is referred to as bradycardia. It may occur in:

Well-trained endurance athletes (physiologically normal)
Underactive thyroid gland (hypothyroidism)
Disorders of the cardiac conduction system
Certain medications such as beta-blockers
During sleep or deep relaxation

How Is Heart Rate Measured?

Heart rate can be measured using several methods:

Manual pulse check: Counting beats at the wrist (radial artery) or neck (carotid artery) over 60 seconds.
Electrocardiogram (ECG): The most accurate method for assessing heart rate and rhythm.
Pulse oximetry: A finger clip device that simultaneously measures heart rate and blood oxygen saturation.
Smartwatch or fitness tracker: Optical sensors using photoplethysmography (PPG) detect heart rate non-invasively.

Factors That Influence Heart Rate

Many factors can affect heart rate, including:

Physical activity and exercise temporarily increase heart rate
Relaxation, meditation, and sleep lower heart rate
Age, sex, and body weight play a role
Medications, alcohol, nicotine, and caffeine can alter heart rate
Emotional states such as fear or excitement raise heart rate

Clinical Relevance and When to See a Doctor

A persistently elevated or reduced heart rate without an obvious cause should be evaluated by a healthcare professional. Accompanying symptoms such as dizziness, chest pain, shortness of breath, or fainting require immediate medical attention. In clinical settings, heart rate is routinely monitored as part of standard vital sign assessment.

References

World Health Organization (WHO): Cardiovascular diseases - Key facts. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)
Kasper D. L. et al.: Harrison's Principles of Internal Medicine, 20th Edition. McGraw-Hill Education, 2018.
American Heart Association (AHA): All About Heart Rate (Pulse). Available at: https://www.heart.org/en/health-topics/high-blood-pressure/the-facts-about-high-blood-pressure/all-about-heart-rate-pulse

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