There's been a lingering suspicion that too much running is bad for you and, in particular, bad for your heart.Pheidippides, the ancient Greek courier who ran from Marathon to Athens back in 490 BC, supposedly dropped dead after delivering his message.
In particular, the researchers were looking for evidence of fibrosis, or scarring, of the heart, which has turned up in several previous athlete studies. For example,of 12 hardcore endurance athletes who’d completed an average of 178 marathons and 65 ultramarathons each found evidence of fibrosis in half of them.
That seems like a smoking gun. But similar hinge-point scarring was also seen in four of the 20 recreationally active controls – a statistically equivalent prevalence, suggesting that serious endurance training doesn’t substantially raise the risk of this form of scarring. There was also no evidence of diffuse scarring throughout the hearts of the athletes compared to the controls.
I personally have had three friends drop dead while running. Electrolyte depletion was the cause.
Really, now second guessing exercise? Well, take my advice and run, bicycle and treadmill but only do it if you feel good doing it and after.
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