Throughout history, humanity has penned countless poems and songs about the heart in thousands of languages, depicting it as a vessel of love, kindness, and courage.
However, the primary function of the heart is to sustain our lives. This muscular organ, roughly the size of a fist, manages the circulatory system, pumping oxygen-rich blood throughout the body. It can speed up or slow down depending on our emotions, physical exertion, or illness. But generally, a healthy heart beats steadily and reliably.
So, how many beats does the heart make in a day or even over a lifetime?
For example, the intervals between heartbeats slow down and speed up by about 100 milliseconds each time we inhale and exhale. Dr. Partho Sengupta, head of the cardiovascular medicine department at Robert Wood Johnson Medical School at Rutgers University in New Jersey, shared this observation.
Dr. Sengupta says the most fascinating thing about the heart is its ability to change its rate and function based on the body’s metabolic needs. The physiology of the heart constantly adapts, almost as if it has a mind of its own.
In a healthy adult, the heart beats between 60 and 100 times per minute at rest. Harvard Medical School reports the average rate for most adults is between 55 and 85 beats per minute. Meanwhile, because of the energy demands of a rapidly growing metabolism, the average resting heart rate for a newborn is between 70 and 190 beats per minute, according to Benioff Children’s Hospital at the University of California, San Francisco.
Dr. Salvatore Savona, a cardiovascular disease specialist at the Wexner Medical Center at Ohio State University in Columbus, notes that as people age, their heart rate typically slows down somewhat. Time takes its toll on the heart muscle.
For instance, aging can lead to fibrosis—excess connective tissue that interferes with normal heart contractions—or to abnormal heart rhythms such as atrial fibrillation, Dr. Savona said.
Cardiologists note that a person with an average resting heart rate of 70 beats per minute will generate about 100,800 heartbeats in a day. Over a year, that amounts to roughly 36.8 million beats. With an average modern lifespan of 77.5 years, the heart will make about 2.85 billion beats over a lifetime.
Is there a limit to how many beats the heart can make before it wears out and stops? Dr. Sengupta explained that factors such as age, genetics, injuries, and diseases gradually reduce heart performance. But the better we care for this hardworking organ, the longer and more efficiently it will function, he added.
“While aging is a fact of life, and all functions of our body deteriorate over time, we have the opportunity to at least reduce the wear and tear caused by stress,” Dr. Partho Sengupta said in an interview with Live Science.
