COOLING DOWN - ANOTHER MYTH-TAKE

The idea of the cool-down seems to have originated with a popular theory — now known to be wrong — that muscles become sore after exercise because they accumulate lactic acid. In fact, lactic acid is a fuel. It’s good to generate lactic acid, it’s a normal part of exercise, and it has nothing to do with muscle soreness. But the lactic acid theory led to the notion that by slowly reducing the intensity of your workout you can give lactic acid a chance to dissipate.

The lactic acid theory is wrong, but it remains entrenched in the public’s mind.

One study of cyclists concluded that because lactic acid is good, it is better not to cool down after intense exercise. Lactic acid was turned back into glycogen, a muscle fuel, when cyclists simply stopped. When they cooled down, it was wasted, used up to fuel their muscles.

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