The researchers found that male athletes with an exercise volume of >3,000 MET-minutes/week showed higher mean coronary artery calcification (CAC) scores than nonathlete males (mean difference = 31.62). No difference in CAC was found for male athletes with 1,500 to 3,000 MET-minutes/week or female athletes with an exercise volume of 1,500 MET-minutes/week or greater.
Not sure what a MET minute is, but 3000 minutes per week is 7 hours per day, seven days a week. So, this sounds like a problem for approximately zero percent of the population.
