I think placebo effect for anything.. Roids, corked bats, etc, will often have great unquantifiable influence too. I mean, does swinging a donut or two bats make you swing faster in your at bat?? No, but I know I was a mess if I couldn't get my two bat warm up swings in before stepping to the plate.
Btw- I think there are 4 separate references to the same website now. It's an informative read, and in my opinion explains the physics nicely.
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