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Your sweat holds a lot of information about the state of your health<\/p>\n
Ryan Pierse\/Getty Images<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
Wow, you\u2019re quite salty,\u201d says Stefan van der Fluit, looking over my numbers. I could have told him that. I have just done a sweaty, 45-minute workout on an exercise bike and the salt is already starting to crystallise on my T-shirt. But van der Fluit knows exactly how salty. I have just sweated out 347 milligrams of sodium in 370 millilitres of water. That\u2019s on the high side, sodium-wise, and I need to replenish.<\/p>\n
Van der Fluit is the co-founder of a company called Flowbio, based in London, which specialises in sweat analysis for athletes. During my workout, I was wearing a sensor called the S1 on my upper arm, which collects sweat in a tiny channel, automatically measures its volume and sodium concentration, and transmits the data to a smartphone app. Using that data, the app calculates my total losses.<\/p>\n
If I were an endurance athlete, that data would be extremely valuable, perhaps the difference between winning and losing. I\u2019m not, but van der Fluit is. As a competitive cyclist, he has had long-standing problems with dehydration. But since he started using the sweat sensor, they have gone away, and his performance has improved.<\/p>\n
Flowbio\u2019s S1 is one of a handful of wearable sweat sensors that have come onto the market in the past few years. They are mainly aimed at people who sweat a lot in the course of their jobs \u2013 athletes and manual workers \u2013 but they are also available to\u2026<\/p>\n<\/p><\/div>\n
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![\"Sweat](\"https:\/\/images.newscientist.com\/wp-content\/uploads\/2024\/12\/02120040\/SEI_231002872.jpg\")
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