Exercise and heart attack.

Physical activity is good for your heart, right? You may be surprised to learn that recent reports note that exercising could block up your coronary arteries. Today, we look at this widely reported research investigation.

The study discovered that very active people have higher coronary artery calcium (CAC) scores than less active people. The CAC score measures the calcium amount in the coronary artery walls. Coronary arteries supply oxygen-containing blood to our heart muscles.

Arterial calcium development is closely associated with blood vessel injury, inflammation, and repair. Calcification occurs very early in the process of atherosclerosis. An increase in coronary artery calcium may increase your risk of having a heart attack. The presence of calcium is a sign that there may also be a buildup of plaque, a condition we call atherosclerosis.

Micrograph of an artery that supplies the heart showing significant atherosclerosis and marked narrowing.
A coronary artery with significant atherosclerosis and marked narrowing. https://en.wikipedia.org/wiki/Atherosclerosis

Plaque buildup can result from unhealthy health habits, such as smoking, consuming alcohol, being overweight, or not getting adequate physical activity. Individuals with metabolic syndrome, dyslipidemia, high blood pressure, chronic kidney disease, or a high baseline C-reactive protein level have an increased risk of developing coronary artery calcification.

Doctors often use coronary artery calcification (CAC) scores to identify people at risk of heart disease. CAC scores can classify patients into low-risk and high-risk categories. CAC is common and is age and gender-dependent. It is present in 90% of men and 67% of women older than 70.

Researchers discovered that very active people have higher coronary artery calcium (CAC) scores than less active people. As we have learned, an increase in calcium in the heart arteries may increase a person's heart attack risk (given calcium can signify a buildup of plaque or atherosclerosis).

The scientists from the University School of Medicine (South Korea) and Johns Hopkins Bloomberg School of Public Health (USA) analyzed the coronary artery calcium of over 25,000 healthy adults (mainly men) 30 years and older. The subjects had two comprehensive check-ups to monitor changes in their coronary arteries.

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