Researchers in Chicago found that Caucasian men who work out for at least 7.5 hours per week are the most at risk.
"We were surprised by the finding, mainly because we essentially think of exercise as medicine".
The group from the University of IL at Chicago and Kaiser Permanente took a gander at the physical movement directions of 3,175 highly contrasting members in the longterm CARDIA consider and surveyed the nearness of CAC.
But Laddu doesn't want any men to hang up their running shoes just yet, because there are many questions that remain to be answered. There was a similar trend for white women, the study says, but it was not statistically significant.
Unique to the new study is the evaluation of long-term exercise patterns, from young adulthood into middle age.
While, in past studies, high levels of cardiorespiratory fitness have been linked to lower levels of CAC in the future and a minimized risk of cardiovascular disease, Laddu and co-authors wrote the connection between exercise and coronary subclinical atherosclerosis hasn't ever been explored in a population as its members age.
"In essence, there's a lot that we don't know", Ludu said in an online video accompanying the study. "Much more research will be needed to understand what is really going on".
"There is a stress reaction to long distance and long duration exercise - your cortisol is up for a long time", Khan said.
The results surprised the study's authors, who expected individuals with higher levels of physical activity to have lower levels of CAC in the long term.
"It does not suggest that anyone should stop exercising". "And it is vital to maintain health levels of blood pressure, cholesterol and body weight, as well as not smoke, even if one is engaging in regular rigorous physical activity". Members of the CARDIA study were followed from 1985 through 2011.
Scientists believe that too much exercise over time can cause stress on the arteries - leading to higher coronary artery calcification (CAC). "The problem in the U.S.is the exact opposite, that most people are getting nowhere near the recommended amount of exercise". Study participants were divided in three groups based on their exercise level. One group exercised below the guidelines level.
The men were grouped by the number of minutes they worked out per week on average. For one, she noted that very few of the high exercisers were black, making it hard to draw definitive conclusions.
Surprisingly, the same didn't apply for black men.