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This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Do you like working up a sweat?

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Or do you feel like maybe sweat should work for you?

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Well, hold on to your sudoriferous glands.

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Because researchers have designed a device that could someday produce power from your perspiration.

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The schvitzy scheme was presented at the annual meeting of the American Chemical Society in San Francisco.

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Strenuous exercise generates lactate, the molecule that makes overworked muscles burn.

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Athletes sometimes evaluate their fitness by checking the lactate levels in their blood.

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To cut down blood draws, researchers came up with a monitor that could measure the lactate in sweat.

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The device they designed strips electrons from lactate, which creates a small electric current.

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The strength of the current reveals the amount of lactate present.

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To test the system, 10 volunteers wore the arm-patch sensor while they rode a stationary bike.

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And the device recorded the current they delivered as they dripped.

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Then the researchers thought, what if they could tap into this energy to develop a sort of sweat-powered "bio battery?"

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Their proof-of-concept setup topped out at only about 4 microWatts of juice¡ªnot even enough to run a watch.

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But with better electronics, exercising in the future could make dirty clothes and some clean energy.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.

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