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Too much exercise can kill you - especially if you're a white man: Study finds 7.5 hours a week of fitness DOUBLES your risk of heart disease


Too much exercise can kill you, scientists have revealed.

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.

It was suggested high levels of exercise over time caused stress on the arteries leading to higher coronary artery calcification - CAC.

However scientists warned people should not stop exercising.

The team from the University of Illinois at Chicago and Kaiser Permanente looked at the physical activity trajectories of 3,175 black and white participants in the longterm CARDIA study and assessed the presence of CAC.

The presence and amount of CAC, is a significant warning sign to doctors that a patient may be at risk for developing heart disease and a signal to consider early preventive care.
Dr Deepika Laddu, assistant professor of physical therapy in the UIC College of Applied Health Sciences, said: 'We expected to see that higher levels of physical activity over time would be associated with lower levels of CAC.'

However they found that at the top level of exercise, there was no extra risk for black men, but an 86 percent increased risk for white men.

Unique to the new study is the evaluation of long-term exercise patterns, from young adulthood into middle age.

The study group had eight follow-up examinations over 25 years, from 1985 through 2011, starting at age 18 to 30 and finishing at 43 to 55.

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,'

Study co-author Dr Jamal Rana, a cardiologist at Kaiser Permanente in Oakland said: 'High levels of exercise over time may cause stress on the arteries leading to higher CAC.
'However this plaque buildup may well be of the more stable kind, and thus less likely to rupture and causes heart attack, which was not evaluated in this study.'

However he added: 'It does not suggest that anyone should stop exercising.'

The findings are published in the journal Mayo Clinic Proceedings.
Original article here


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"Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are."  
- John Wooden