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Endurance athletes have less problems than in general, up to a point. Once they start doing ultras and marathons all the time, then their heart problem rate drops back to that of the general population, but not below.
And yes, steady state can lead to muscle catabolism. That's to be expected. Your body wants to shed unnecessary weight so it can become more efficient at what you're asking it to do. The extent of catabolism will be determined by caloric intake, training and how long and intense that steady state training is.
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