Is it just me, or has every millennial suddenly taken to running marathons on a Sunday morning? From carrying huge Stanleys in order to drink more water for clear skin, to flavouring our water with powdered electrolytes, hydration is key! On the other end of the spectrum, “the more you sweat, the faster you’ll lose weight”, is a statement that we now know isn’t true, but still is etched in our brains since childhood.
Now that we know this one-size-fits-all approach does not stand, a very small but eminent wave has taken over the wellness industry and brands are focusing on sweat as the next trending and measurable biometric to enhance performance.
Yes, you read that right, sweat.
What the Research Says
- A study by Gao et al. (2023) concluded that analysis of chemical biomarkers found in sweat is most accurately measured by wearable and flexible electrochemical sensors, enabling continuous, real-time and non-invasive health monitoring.
- Another study by Assalve et al. (2023) confirms that wearable devices that monitor multiple sweat biochemical parameters (lactate, glucose and electrolytes), are a must-have, non-invasive tool for optimizing athletic performance, hydration and fatigue.
- While wearable tech remains a great way for analysing hydration, this study notes that the field is still nascent and clinical diagnostics will require rigorous validation, calibration against gold-standard methods, robust sensors under varied real-world conditions, before it becomes commercial.
- A notable study published in 2024 by Nan Gao, Guodong Xu, Gang Chang & Yuxiang Wu, depicts how self-powered sweat sensors show huge promise, but also highlights their limitations. Unstable sensing materials, weak energy-harvesting performance and major challenges in real-world sweat collection could make this tough to commercialise.
Brands Leading the Way- FLOWBIO, Electrokare, hDrop and Nix Hydration Biosensor
FLOWBIO
FLOWBIO was founded in London in 2020 and has introduced a groundbreaking wearable hydration sensor, S1. The S1 sensor is hand-assembled and individually tested at its HQ to carefully ensure high-quality and accurate sweat measurements.
The sensor uses microfluid technology to collect sweat through a tiny channel on the skin and measures both fluid (L/hr) and sodium loss (mg/L) in real time. These are delivered through the FLOWBIO app and combined with skin temperature and training intensity, are used to generate personalised hydration strategies using their proprietary Advanced Hydration Intelligence algorithm.
FLOWBIO also connects to common fitness platforms such as Wahoo, Garmin, Zwift and Coros. This, along with an impressive 100-hour battery life, USB-C charging and no subscription, makes it easy to integrate into your existing training routine.
Electrokare
Electrokare has been quietly redefining how fitness freaks and athletes can take their training to the next level by unlocking something the world has never been able to continuously track- real-time, blood-based electrolyte activity, without the blood.
The sensor reads sodium and potassium loss directly from the skin, as and when it happens, without requiring invasive blood work. Electrokare waits 10 minutes after a workout before generating a recovery guidance because they have discovered that immediate post-exercise data is noisy and does not give a true picture.
Their shift from guesswork to precision represents a new era in training. With its public beta now open, Electrokare is helping athletes see how their bodies respond to stress, heat and workload.
hDrop
hDrop is another hydration tracking wearable making waves in the sports world. It’s a reusable wearable biosensor that tracks sweat loss, sweat rate and sodium and potassium concentrations continuously.
It has a compact, skin-contact design that is IP-66 rated, has USB-C rechargeability and delivers lab-level hydration data. This device offers three modes- Thumb Test, Light Activity and Intense Activity, so that you can measure hydration whether you’re walking, working at a desk or training hard.
It presents the data in Sweat Zones (Concentrated, Target or Diluted), which helps you fine-tune your fluid and electrolyte strategy. hDrop has integrated with Hammerhead Karoo devices for live updates during cycling and has also been adopted by professional teams like the RCD Espanyol for personalised hydration planning.
However, it does not integrate further with activity tracking apps like Garmin or Wahoo, unlike FLOWBIO. The data is limited and if they could make such an integration happen, the sweat rate estimated would be improved significantly.
Nix Hydration Biosensor
A single-use sweat patch paired with a tiny, reusable Bluetooth pod makes for the Nix Hydration Biosensor. The patch clips on with tape, collects and measures your sweat rate, fluid loss and electrolyte composition and sends the data to the Nix app every second.
It has a battery life of up to 36 hours, and it is built to handle your long training sessions. How Nix differentiates itself from other brands in the same space is that it gives in-workout drink reminders, post-session summaries and even recommends which electrolyte drinks to use based on your personal sweat profile.
Nix has pilot programs in military, industrial and team sport settings. It is also the official hydration sensor partner for USA Triathlon.
From Standard Wellness Advice to Tailored Biofeedback
We’ve all heard the standard wellness advice- drink 3-4 liters of water per day, protein over carbs, pilates and yoga, but all this approach varies from person to person. That’s where sweat and hydration data come into play.
The shift had begun with wellness tech: smart watches make ECG testing possible at your fingertips, smart rings turned sleep stages and recovery into actionable metrics and glucose monitors taught us how each food affects our body.
The pattern remains the same- objective data, tailored to your body, outperforms general guidelines.
For people already tracking these metrics, sweat is the next big thing! Athletes and people into fitness can now understand their fluid loss, electrolyte depletion and recovery needs in real time.
Who Is Using Sweat Data?
- Athletes, marathoners and ultrarunners.
- Cyclists and gravel riders.
- CrossFitters and functional fitness trainees.
- Coaches and performance labs.
Wrap Up
You know how they say when you taste caviar, you can’t go back to catfish, ok, Blair Waldorf said that, but it is true. And Sweat data will do the same for you. Knowing these numbers gives you a much better chance at recovery and you cannot go back to training with estimates.
FLOWBIO, Electrokare, hDrop and Nix Hydration Biosensor are running this revolution and we can’t wait to see how people integrate the same into their day-to-day. Whether you’re chasing podiums and medals or simply trying to up your game without crashing midway, hydration isn’t an afterthought; it’s a strategy!
