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I have to say, as a former track runner, I was a little bit disappointed to see that my running fitness doesn't exactly keep me from gassing out when I am grappling. -_- disappointing. Increasingly I think endurance for grappling is specific to grappling. Maybe because it's more upper body?
It's because grappling draws on the anaerobic system, and the performance of the anaerobic system mainly comes from adaptations in the periphery of the body, specifically in the muscles that are actually being used (IIRC the adaptations relate to the way that ATP is synthesized and its metabolites are broken down and recycled, check with sports sciencey guys..). Running anything more than 400m mainly draws and develops the aerobic system. With aerobic system development the main adaptation is the output of the cardiovascular system. There are some peripheral adaptations, but they relate to the uptake of oxygen to fuel slower (aerobic) synthesis of ATP. Not faster (anaerobic) synthesis. And if you are a runner those adaptations will be in the legs.
But yes, the aerobic system should still be contributing quite a bit of power when you are grappling, and so that running background ought to be helping. It would indeed be worse without it.