Forskare från Chicago hävdar: Vita män som tränar mycket har ökad risk att dö

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.'

Atherosclerosis can be caused by lifestyle factors, such as smoking and regularly drinking excessive amounts of alcohol.
You're also more at risk of getting atherosclerosis if you have conditions like high cholesterol, high blood pressure (hypertension) or diabetes.

Coronary artery calcification (CAC) is highly prevalent in patients with coronary heart disease (CHD) and is associated with major adverse cardiovascular events.

CAC can usually be found in patients with severe CHD, and this asymptomatic phenomenon make early diagnosis of CAC important.

Arteriosclerosis occurs when the blood vessels that carry oxygen and nutrients from your heart to the rest of your body (arteries) become thick and stiff — sometimes restricting blood flow to your organs and tissues.

Treatment for coronary artery disease usually involves lifestyle changes and, if necessary, drugs and certain medical procedures.

Quit smoking
Eat healthy foods
Exercise regularly
Lose excess weight
Reduce stress

Get moving. Exercise helps manage weight and control diabetes, high cholesterol and high blood pressure — all risk factors for coronary artery disease. Get at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity a week, or a combination of moderate and vigorous activity.

Tunica interna/Tunica intima ("inre lagret") består av ett lager med endotelceller mot den inre håligheten där blodet strömmar. Under endotelcellsskiktet finns först ett basalmembran och därefter bindväv med sporadiska inslag av glatta muskelceller.
Tunica media ("mellanlagret") består av glatta muskelceller, elastiska fibrer samt kollagena fibrer.
Tunica adventitia ("yttersta lagret") består framförallt av kollagena fibrer men även elastiska fibrer och glatta muskelceller.

De blodkärl som leder syrerikt blod från hjärtat ut till kroppens celler, och syrefattigt blod till lungorna, kallas för artärer och blir styvare när man blir äldre.

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.

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.

Training for a First-Time Marathon Reverses Age-Related Aortic Stiffening

There is so much here to effectively render the study useless

1. What was the diet like? Macros? 2. What types of exercise did they participate in? 3. What intensity were their workouts? 4. What supplements were taken? 5. Is there a cultural difference in supplement usage among races? 6. Were steroids and or HGH ever used and is there a significant racial difference in use? 7. What other risk factors were there and was there a racial correlation with certain risk factors? These kinds of studies often correlate completely unrelated data and paint a picture that can have a serious and lasting effects on legislation and policy. Even after proven wrong many times over. It's irresponsible to say the least. For example, lets just speculate that the Black men interviewed tended to work out more with weights & some sport as supplement while the white men tended to do longer duration exercising like biking or running. In this case you're comparing modalities and not so much race.