科学美国人60秒 SSS 2014-08-20
时间：2014-09-24 08:17:15
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（单词翻译）
Do you like working up a sweat? Or do you feel like maybe sweat should work for you? Well, hold on to your sudoriferous glands1. Because researchers have designed a device that could someday produce power from your perspiration2. The schvitzy scheme was presented at the annual meeting of the American Chemical Society in San Francisco.
Strenuous3 exercise generates lactate—the
molecule4 that makes overworked muscles burn. Athletes sometimes evaluate their fitness by checking the lactate levels in their blood. To reduce blood draws, researchers came up with a monitor that could measure the lactate in sweat. The device they designed strips electrons from lactate, which creates a small electric current. The strength of the current reveals the amount of lactate.
To test the system, 10 volunteers wore the arm-patch
sensor5 while they rode a
stationary6 bike. And the device recorded the current they delivered as they dripped.
Then the researchers thought, what if they could tap into this energy to develop a sort of sweat-powered “bio battery?” Their proof-of-concept setup topped out at only about 4 microWatts of juice—not even enough to run a watch. But with better electronics, exercising in the future could make dirty clothes and some clean energy.
—Karen Hopkin
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