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Normal Heart Rate: Resting and Active Heart Rate
A normal resting heart rate for adults ranges between 60 and 100 beats per minute (bpm). This is the typical range when the body is at rest, and deviations from it may signal an abnormal heart rhythm or underlying heart disease.
The heart is a muscular organ that pumps blood throughout the body’s circulatory system, ensuring a continuous flow of oxygen-rich blood. With every heartbeat, it maintains a steady flow that supports vital organ function and overall health.
The cardiac cycle starts when the right atrium receives deoxygenated blood from the body, serving as a reservoir that primes the right ventricle. The right ventricle then pumps blood to the lungs for oxygenation. The oxygenated blood moves to the left atrium and then the left ventricle, which contracts to push the oxygen-rich blood into the arteries, supplying vital organs with oxygen and nutrients.
The heart’s rhythmic contractions are initiated and coordinated by electrical signals from the sinoatrial (SA) node – the heart’s natural pacemaker. A healthy SA node helps maintain a normal sinus rhythm and adjusts the heart rate based on physical activity, stress, and other factors that affect cardiovascular demand.
Resting Heart Rate vs Active Heart Rate: What Should You Monitor?
Your heart rate changes throughout the day depending on your activity, emotions, hydration, sleep, caffeine intake, medications and overall health. For this reason, it is useful to understand the difference between resting heart rate and active heart rate.
Resting heart rate is your heart rate when your body is relaxed and not physically active. It is usually best checked when you are calm, seated or lying down, and have not recently exercised, consumed caffeine or experienced stress. For most adults, a normal resting heart rate is usually between 60 and 100 beats per minute (bpm).
Active heart rate is your heart rate during movement, exercise or physical activity. It is expected to rise when your body needs more oxygen. A higher heart rate during exercise is not necessarily abnormal, but it should gradually return towards your usual resting range after you stop.
Rather than focusing on a single reading, monitor your usual pattern. Speak to a doctor if your heart rate is repeatedly much higher or lower than usual, feels irregular, does not settle after rest, or occurs with symptoms such as chest discomfort, shortness of breath, dizziness, fainting or unusual fatigue.
Factors Influencing the Heart Rate
What Affects Your Heart Rate?
Your heart rate is influenced by various internal and external factors, and understanding them helps in maintaining a healthy heart rate and overall cardiovascular fitness. Here are some of the most common factors:
- Age: As you age, your resting heart rate typically decreases. This is due to changes in the heart's electrical system and a reduced response to hormones that regulate heart function.
- Activity Level: During exercise, a commonly used estimate for maximum heart rate is 220 minus your age. For example, the estimated maximum heart rate for a 50-year-old is about 170 bpm. However, this is only a general guide. A suitable exercise heart rate depends on your fitness level, medical history, medications and symptoms. If you have heart disease risk factors or experience chest pain, severe breathlessness, dizziness, fainting or an irregular heartbeat during exercise, stop and seek medical advice.
- Fitness Level: Individuals with high cardiovascular fitness often have a lower resting heart rate, typically ranging from 40 to 50 beats per minute (bpm). Regular exercise enhances the heart’s stroke volume, improving its efficiency in oxygen delivery and resulting in a slower, healthier pulse for physically fit individuals.
- Emotional State: Stress, anxiety, and strong emotions can elevate heart rate due to the body’s “fight or flight” response, preparing for potential threats. For instance, sudden fright can trigger a surge in heart rate.
- Medications and Stimulants: Substances like caffeine and nicotine can temporarily influence heart rate, with certain medications either increasing or decreasing it.
These and other factors, including hydration, sleep quality, and overall health, play a key role in your normal heart rate and how your body responds to different conditions.
Causes of Unhealthy Heart Rates
Several cardiovascular and systemic health issues can interfere with the heart’s normal rhythm:
- Coronary artery disease: Reduces blood flow to the heart, increasing risk of arrhythmias.
- Heart valve disorders: Can lead to inefficient blood flow and irregular heartbeats.
- Congenital heart defects: Structural abnormalities present from birth may disrupt electrical signals.
External factors such as:
- Exposure to extreme temperatures can influence heart rate, with hypothermia causing a decrease in heart rate and heatstroke potentially leading to tachycardia (an elevated heart rate condition).
- Overexertion or overtraining during physical activity, particularly in athletes or individuals engaging in strenuous workouts, can also contribute to tachycardia due to insufficient rest and inadequate recovery.
- Dehydration and imbalances in electrolytes, such as potassium and sodium, have been identified in studies as factors that can disrupt heart rhythm, leading to abnormal heart rates.
When to Seek Medical Attention for an Abnormal Heart Rate
If you experience any of these symptoms, seek medical attention promptly, as they may indicate a serious underlying heart condition:
- Persistent or recurrent chest pain or discomfort
- Severe shortness of breath
- Fainting or loss of consciousness
- Rapid or irregular heartbeat
- Severe dizziness or light-headedness
- Unexplained fatigue or weakness
These signs could be associated with arrhythmias, heart failure, or other cardiovascular conditions. Early evaluation and treatment are crucial in preventing complications and ensuring proper heart function.
Tips for Maintaining a Healthy Heart Rate
To maintain a healthy heart rate, consider the following tips:
- Regularly engage in physical activities to strengthen your heart and lower your resting heart rate.
- Staying hydrated supports cardiovascular health and helps maintain a steady heart rate.
- Limit caffeine intake and quit smoking and other nicotine products to avoid elevating the heart rate.
- Stress and anxiety may contribute to an increased heart rate. As such, try deep breathing, meditation, and yoga to manage stress.
Book a Heart Health Check-Up at Gleneagles Hospitals
Monitoring your heart rate can help you understand your usual pattern and notice changes that may need medical attention. If your heart rate is frequently too fast, too slow, irregular, or accompanied by symptoms such as chest discomfort, shortness of breath, dizziness or fainting, speak to a doctor for proper assessment.
Get in touch with us to book an appointment with our Cardiology specialists, or find out more about Cardiology Services at your nearest Gleneagles Hospital.
