New Hydration Gadgets Face Scrutiny As Consumers Pursue 'Sweat Scores'

Hydration technology is rapidly expanding in the consumer electronics market, driven by public health campaigns and intensified heatwaves. Devices, ranging from sweat monitors to toilet-based urine analysers, promise to optimise fluid intake, yet their effectiveness and impact on user anxiety remain under review.

Sweat Sensors and Real-Time Data

Companies like US-based Epicore Biosystems are at the forefront of sweat-analysing technology. Their products, including disposable patches and wearable sleeves, track sweat flow, sodium content, and skin temperature. Roozbeh Ghaffari, co-founder of Epicore Biosystems, states these devices help users understand their “hydration readiness” and “risk profile” based on a “sweat score.” Some models even vibrate to prompt fluid intake.

These devices are marketed not only to athletes but also to workers in demanding environments such as construction sites and oil and gas facilities, where physical exertion and high temperatures are prevalent.

Expert Scepticism on Accuracy

Andreas Flouris, from the University of Thessaly in Greece, expressed reservations about the accuracy of many sweat-sensing devices he has evaluated in laboratory settings. His unpublished research indicates that most products “do not show the level of accuracy that you would expect.” Flouris suggests that sweat sensors perform best during sustained physical activity, like marathons, but struggle with varied and intermittent exertion, such as that experienced by a footballer.

In response, Ghaffari points to peer-reviewed publications supporting the accuracy of Epicore Biosystems’ gadgets, acknowledging challenges in analysing sweat loss over very short intervals but asserting effectiveness for workouts lasting 30 minutes or longer.

Smart Bottles and Urine Analysis

Smart water bottles represent another segment of the market, utilising glowing rings or sensors to prompt users to drink. Cem Bakiş, head of business development at WaterH, highlights features like social connectivity and point-earning to “make it fun” and help users “build a habit.” These bottles often measure liquid consumption through weight estimation or flow rate detection.

For those seeking alternative data, Vivoo offers a urine-analysing device for toilet bowls, which measures “urine specific gravity” to indicate hydration levels. While scientific studies do use urine-based measurements, Flouris notes a potential delay between dehydration onset and its detection in urine. Vivoo’s website clarifies its products are not intended for medical diagnoses.

Anxiety and Utility Concerns

Tamara Hew-Butler at Wayne State University questions whether frequent health-tracking could inadvertently increase anxiety. While acknowledging the potential utility of hydration tech, particularly for coaches monitoring team members, she cautions against the emotional burden of excessive metrics. “More metrics, reminders and goal-setting are not necessarily what everyone needs,” Hew-Butler stated.

Both Bakiş and a Vivoo spokeswoman addressed these concerns, stating their products aim to foster healthy habits or offer passive, routine-based monitoring to avoid inducing stress. Hew-Butler concludes that the human body is more adaptable to hydration fluctuations than often assumed, suggesting a broader “range of safety” than some technologies imply.