Looks like what we've been taught about lactic acid all these while has been wrong. Just shows you how science is not definite and changes with time. The major findings we discover today may just be debunked by some other breakthrough findings tomorrow. From the New York Times:
Everyone who has even thought about exercising has heard the warnings about lactic acid. It builds up in your muscles. It is what makes your muscles burn. Its buildup is what makes your muscles tire and give out. [...]
The notion that lactic acid was bad took hold more than a century ago, said George A. Brooks, a professor in the department of integrative biology at the University of California, Berkeley. It stuck because it seemed to make so much sense.
"It's one of the classic mistakes in the history of science," Dr. Brooks said. [...]
