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This is Scientific Americans 60 Second Science.

I'm Larry Greenmin.

Oh, 60 second science. I'm Larry Greenmin. During the tense exercise, sprinting, for example,

your body breaks down glucose and produces what's called lactate.

That substance can build up faster than it can be further

processed. If your idea of a workout is running to the refrigerator during

commercials, you probably associate the lactate buildup with a burning in

your muscles. But for well-conditioned

athletes, excessive lactate means muscle fatigue and diminished performance. So athletes

would like to know their actual lactate levels during training and competition.

Blood tests are one way to measure lactate levels,

...