The pursuit of ultimate fitness my damage your heart. From today's Telegraph, we learn about some American research:
Extreme exercise such as marathons may permanently damage the heart and trigger rhythm abnormalities, warn researchers.
They say the safe ‘upper limit’ for heart health is a maximum of an hour a day - after which there is little benefit to the individual.
A review of research evidence by US physicians says intensive training schedules and extreme endurance competitions can cause long-term harm to people’s hearts.
...
Dr O’Keefe and colleagues said research suggests that extreme endurance training can cause transient structural cardiovascular changes and elevations of cardiac biomarkers, all of which return to normal within one week.
But for some individuals, over months and years of repetitive injury, this process can lead to the development of patchy scarring of certain areas of the heart, and abnormal heart rhythms.
In one study, approximately 12 per cent of apparently healthy marathon runners showed evidence for patchy myocardial scarring, and the coronary heart disease event rate during a two-year follow up was significantly higher in marathon runners than in runners not doing marathons.
A year ago the
NY Times told us about research from the UK with a similar result:
Recently, researchers in Britain set out to study the heart health of a group of dauntingly fit older athletes. Uninterested in sluggards, the scientists recruited only men who had been part of a British national or Olympic team in distance running or rowing, as well as members of the extremely selective 100 Marathon club, which admits runners who, as you might have guessed, have completed at least a hundred marathons.
All of the men had trained and competed throughout their adult lives and continued to work out strenuously. Twelve were age 50 or older, with the oldest age 67; another 17 were relative striplings, ages 26 to 40. The scientists also gathered a group of 20 healthy men over 50, none of them endurance athletes, for comparison. The different groups underwent a new type of magnetic resonance imaging of their hearts that identifies very early signs of fibrosis, or scarring, within the heart muscle. Fibrosis, if it becomes severe, can lead to stiffening or thickening of portions of the heart, which can contribute to irregular heart function and, eventually, heart failure.
The results, published online a few weeks ago in The Journal of Applied Physiology, were rather disquieting. None of the younger athletes or the older nonathletes had fibrosis in their hearts. But half of the older lifelong athletes showed some heart muscle scarring. The affected men were, in each case, those who’d trained the longest and hardest. Spending more years exercising strenuously or completing more marathon or ultramarathon races was, in this study, associated with a greater likelihood of heart damage.
So if you do too many Iron Man and short course Tin Man competitions, eventually you may need a new heart. Cool - say 'hi' to Dorothy and the wizard.
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