If you are a white guy, too much exercise is bad for you …!?

A study spanning 25 years in Chicago. This is in the Daily Mail (UK). FULL DISCLOSURE: That's not me in the picture…

White men who work out at least seven-and-a-half hours a week are nearly twice as likely to suffer from heart disease than those who do a moderate amount, a new study shows. Researchers in Chicago assessed exercise patterns over the course of 25 years and made the surprising discovery that very active white men are 86 percent more likely to experience a buildup of plaque in the heart arteries by middle age. But this didn't apply to black men, they discovered.

Researchers split participants into three distinct groups, based on physical activity patterns.

Group one was defined as exercising below the national guidelines of less than 150 minutes a week, group two as meeting the national guidelines of 150 minutes a week and group three was exercising three times above the national guidelines over 450 minutes a week.

Overall, those in group three were 27 percent more likely than those in group one to develop CAC by middle age.

When these findings were divided by race and gender, they found that white men were at the highest risk as they were 86 per cent more likely to have CAC.

There was no higher odds of CAC for black participants who exercised at this level, and while there was a similar trend for white women it was not statistically significant.

Prof Laddu added: 'Because the study results show a significantly different level of risk between black and white participants based on long-term exercise trajectories, the data provides rationale for further investigation, especially by race, into the other biological mechanisms for CAC risk in people with very high levels of physical activity,'