All About Heart Rate (Pulse) | American Heart Association
https://www.heart.org/en/health-topics/high-blood-pressure/the-facts-about-high-blood-pressure/all-about-heart-rate-pulse
Your heart rate, or pulse, is the number of times your heart beats per minute. Normal heart rate varies from person to person. Knowing yours can be an important heart-health gauge. As you age, changes in the rate and regularity of your pulse can change and may signify a heart condition or other condition that needs to be addressed.
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