Gx patches at Sweat It Out, sponsored by Gatorade at TED2019: Bigger Than Us. April 15 – 19, 2019, Vancouver, BC, Canada. Photo: Dian Lofton / TED

Imagine if, after your next workout, you could see not only how much you sweat, but what you sweat — and how to replenish what’s missing. That’s the promise of a new sweat analysis patch from Gatorade, shown in preview form at TED2019.

How it works: You place the small, flexible patch on your arm before a workout. Then the microfluidics inside the patch get to work. As Tucker Fort, a partner at Gatorade collaborator Smart Design, explains: “It measures what your sweat rate is, and the electrolyte content of your sweat.” The channels in the patch turn color to indicate what they’re sensing. (The microfluidics tech is developed in collaboration with Epicore Biosystems.) Afterwards, you snap a picture of the patch with the Gx app, which uses image processing to interpret the data for you.

“With those data points in your profile,” says Fort, “we’re able to make recommendations for you based on how your body performs, and suggest what you should drink before and during your workout, and to recover.” Recommendations will change day to day, based on factors like the weather and the duration of your workout.

What to do with this data? Well, Gatorade’s got you covered. Once you’ve got your patch data, the Gx app — set to be available in 2020 — will help you select a personalized Gatorade hydration plan that recommends the right amount of fluid, electrolytes and carbohydrates that match your data. The personalized drink options are contained in small pods of concentrated Gatorade, each about the size of a tangerine. You pick your personalized pod of concentrate, pierce it onto a special reusable water bottle, and mix the concentrate with 30 ounces of fresh water. As Fort says. “It’s a totally new form factor for delivering a sports drink.”

You can’t get this patch+pod system just yet as a consumer, says Fort; “we’re going through the final scientific tests with sports scientists before we scale commercially.” But all week during TED, lucky attendees could try the patches during morning fitness events presented by Gatorade, ranging from early-morning runs to yoga, tai chi and an active class called, appropriately, Sweat It Out.