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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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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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