Great question — answering as the UphillTech team:
When you say sprinting I suppose you mean the instant when a rider starts pedaling after freewheeling. The plain pedaling during a sprint doesn't put any meaningful stress on the freehub since all the moving components are resting against each other and the materials will not deform under the loads any rider can produce. Freehub can suffer a failure when the rider starts pedaling and the freehub body acts as a hammer against the pawls. In the worst case scenario freezing lubricant, or maybe dirty hub internals too, can leave a pawl improperly seated in the ratchet mechanism and the hit can concentrate on the point of the ratchet tooth and deform it. Trying to figure out where the...
Full answer by Torben: https://bicycles.stackexchange.com/a/100009 (CC BY-SA 4.0).
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