A new wearable sensor can detect dehydration and fatigue

Innovative new wearable
The wearable that can measure your sweat.

Counting steps is just the start: researchers are coming up with sensors that are smaller, more intelligent and less expensive all the time, and these innovations will eventually filter down to the wearables we have on our wrists and around our ankles.

A new sensor developed by engineers at the University of California, Berkeley, can measure the metabolites and electrolytes in sweat. By combining the readings with skin temperature data, the sensor can alert the user to fatigue, dehydration and dangerously high body temperatures.

So your next fitness tracker might be able to warn you when you're overdoing it as well as counting how many laps you've done of the local park - although it's going to be a while before this technology makes it into consumer products that you can actually go out and buy.

The science of sweat

Your sweat reveals more about you thank you might think, and scientists are hopeful that a wearable based on this new technology could replace a blood test in some situations - no needles and no trip to the doctor's required.

There are more than 10 integrated circuit chips on the prototype wearable designed by the academics, and a team of volunteers were put through various indoor and outdoor exercises to test its effectiveness. All the data collected by a wristband or a headband can be fed back to a smartphone just like the wearables of today.

"Human sweat contains physiologically rich information, thus making it an attractive body fluid for non-invasive wearable sensors," says principal investigator Professor Ali Javey. "However, sweat is complex and it is necessary to measure multiple targets to extract meaningful information about your state of health."

David Nield
Freelance Contributor

Dave is a freelance tech journalist who has been writing about gadgets, apps and the web for more than two decades. Based out of Stockport, England, on TechRadar you'll find him covering news, features and reviews, particularly for phones, tablets and wearables. Working to ensure our breaking news coverage is the best in the business over weekends, David also has bylines at Gizmodo, T3, PopSci and a few other places besides, as well as being many years editing the likes of PC Explorer and The Hardware Handbook.

Latest in Tech
Apple iPhone 16e
Which affordable phone wins the mid-range race: the iPhone 16e, Nothing 3a, or Samsung Galaxy A56? Our latest podcast tells all
The Apple MacBook Air next to the Dyson Supersonic R and new AMD GPU
ICYMI: the week's 7 biggest tech stories from the best tech at MWC to Apple's new iPads and MacBooks
A triptych image featuring the Bose Solo Soundbar 2, Nothing Phone 3a Pro and the Panasonic Lumix S1R II.
5 trailblazing tech reviews of the week: Nothing's stylish, affordable flagship and why you should buy AMD's new graphics card over Nvidia's
The best tech of MWC 2025 examples, including the Nothing Phone 3a Pro, the Nubia Flip 2, and the Lenovo Solar PC
Best of MWC 2025: the 10 top tech launches we tried on the show floor
Toy Fair 2025 Primal Hatch
The 7 best toys we saw at Toy Fair 2025, from a Lego boat to a hatching, robotic dinosaur
ICYMI
ICYMI: the 7 biggest tech stories of the week, from a next-gen Alexa to the new iPhone 16e
Latest in News
Mufasa is joined by another lion, a monkey and a bird in this promotional image
Mufasa: The Lion King prowls onto Disney+ as it finally gets a streaming release date
An American flag flying outside the US Capitol building against a blue sky
Sean Plankey selected as CISA director by President Trump
An Nvidia GeForce RTX 4060 on a table with its retail packaging
Nvidia RTX 5060 GPU spotted in Acer gaming PC, suggesting rumors of imminent launch are correct – and that it’ll run with only 8GB of video RAM
Indiana Jones talking to a friend in a university setting with a jaunty smile on his face
New leak claims Indiana Jones and the Great Circle PS5 release will come in April
A close up of the limited edition vinyl turntable wrist watch from AndoAndoAndo
This limited-edition timepiece turns the iconic Technics SL-1200 turntable into a watch, and I want one
A close up of Gemma sitting down in Severance season 2 episode 7
'I'm like Gemma – I'm in the dark': Severance star Dichen Lachman shares disappointing filming update for the popular Apple TV+ show's third season