Thursday, September 25, 2008

why are men faster than women?

Women are slower than men in running, in swimming, in cycling. Whether it is a 100-meter race on the track or a marathon, a 200-meter butterfly swim or a 10-kilometer marathon swim, the pattern holds.

And even though some scientists once predicted that women would eventually close the gender gap in elite performances — it was proposed that all they needed was more experience, better training and stronger coaching — that idea is now largely discredited, at least for Olympic events. Researchers say there is no one physiological reason for the gap, although there is a common biological thread.

“To a large extent, it’s a matter of testosterone,” said Dr. Benjamin Levine, director of the Institute for Exercise and Environmental Medicine at Presbyterian Hospital and the University of Texas Southwestern Medical Center in Dallas. “That’s why systematic doping of women is even more effective than systematic doping of men. That’s why the East German women were so much more successful than the East German men.”

The hormone affects everything from muscle size and strength to the size of the heart to the amount of oxygen-carrying blood cells in the body to the percentage of fat on an athlete’s body. Every one of those effects gives men a performance advantage.

Testosterone, Levine said, gives men what he calls a bigger and better-fueled engine. Their skeletal muscles, which do the work during exercise, are bigger. And their hearts, which provide fuel for the work, are bigger, too.

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