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Head first? Feet first? You decide
2008-09-26 14:59
by Bob Timmermann

Or in this case, Washington University of St. Louis Engineering Professor David A. Peters has studied the issue scientifically and come to the conclusion that the Pete Roses and Rickey Hendersons of the world get to where they are going faster than the Ty Cobbs of the world.

"It turns out your center of gravity is where the momentum is," Peters says. "This is found half way from the tips of your fingers to the tips of your toes. In the headfirst slide, the center of gravity is lower than halfway between your feet and hands, so your feet don't get there as fast. It's faster head-first."

For a long time — until roughly the Pete Rose era of the '60s and '70s — players shunned the headfirst slide to protect their hands and faces. Spikes, evoking the Ty Cobb days, were weapons on the diamond. In the past few decades, players who prefer the head-first slide have taken to running while holding onto their batter's gloves to prevent their hands from opening up and being exposed to injury. While the percentage of players who slide one way or the other is not actually known, Peters estimates it's about 50-50.

Comments
2008-09-26 15:32:03
1.   Cliff Corcoran
Ah, but the real debate is over sliding into first base. There, Peters confirms the conventional wisdom:

"Peters notes a growing number of players who will slide into first base, despite conventional wisdom that running through first is the faster way.

"Mathematically, you might think there's an advantage, but leaving your feet is actually a detriment because you're no longer pulsing (pumping your legs) and you start to decelerate," he says. "When you're running, your get your feet out in front of the center of gravity, so you're getting maybe three or four steps of an advantage."

Peters says the only advantage of any slide into first base is to avoid the first baseman's tag when he has to come off the base to spear an errant throw.

"In general, most agree to run through first, but you'll find people who will swear it's better to do it the other way."

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