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They arent athletes trying to protect every ounce of hard earned muscle...if they used up some muscle for fuel to get the job done they wouldnt care....a BB would prefer to avoid that hence not doing something that causes gluconeogenesis while in ketosis.
Have you looked at the average marathon/ultra marathon runner? Not my idea of maintaining muscle.
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They keep track of the muscle they need,and they feel they can actually maintain muscle mass....whether there is a curve I don't know.They also claim they recover much better and that the lactate threshold is improved.
Its not really difficult to see that a specific exercise/training has a completely different affect on the amount of lean mass an athlete carries. You can compare an HIT athlete ie sprinter to a steady state athlete ie marathon runner and see the difference immediately...one builds muscle the other destroys it....no study required. This is irregardless of fuel intake. I would be interested to see a comparison of athletes say in the Boston Marathon or Tour De France who were on keto diets vs carb based diets and how they finished.
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