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There May Be Such a Thing as 'Too Much Exercise'

Research suggests that moderate activity might be best for people with pre-existing heart disease
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WebMD News from HealthDay

By Robert Preidt

HealthDay Reporter

WEDNESDAY, May 14, 2014 (HealthDay News) -- Is there a limit to the benefits of exercise? Two studies suggest that, for certain people, keeping to a moderate physical activity regimen may be best for heart health.

One study found that a schedule of intense workouts actually boosted the risk of death from heart attack or stroke in older people with pre-existing heart disease, while the other found that young men who did a lot of endurance exercise were at higher risk for heart rhythm problems later in life.

However, one expert unconnected to the studies stressed that, on the whole, exercise is good medicine.

"Folks with heart disease should continue to engage in some form of daily physical activity," urged Barbara George, director of The Center for Cardiovascular Lifestyle Medicine at Winthrop-University Hospital in Mineola, N.Y. But she said moderation is key.

"You shouldn't feel you have to become a marathon runner to reap the benefits," George said.

The first study was led by Dr. Ute Mons of the German Cancer Research Center in Heidelberg, Germany, and included more than 1,000 people. Most of the participants were in their 60s, had stable heart disease and were tracked for 10 years. About 40 percent exercised two to four times a week, 30 percent worked out more often, and 30 percent exercised less often.

Compared to those who got regular exercise, the most inactive people were about twice as likely to have a heart attack or stroke, and were about four times more likely to die of heart disease and all causes, the researchers said.

However, Mons' team also found that those who did the most strenuous daily exercise were more than twice as likely to die of a heart attack compared to those who exercised more moderately.

The second study was led by Dr. Nikola Drca of the Karolinska Institute in Stockholm, Sweden, and included more than 44,000 Swedish men, aged 45 to 79. All of the men were asked about their physical activity levels at ages 15, 30, 50 and during the previous year. Their heart health was then tracked for an average of 12 years.

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