[Paddlewise] Kayak fueling

I was out yesterday paddling hard and burning muscle and got
to thinking about a thread a while back about frequent
fueling. It struck me as a really bad evolutionary path to
burn muscle before fat. Akin to burning your cloths to keep
warm. Does this muscle-burning occur at moderate levels of
exertion, or just extreme levels? I could see burning muscle
running from a sabretooth, but not plodding along looking
for food.

Any estimates of caloric expense in paddling say, 200 pounds
at 4 mph? I had a big breakfast.

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