Know Your Sweat: The Science of Personalized Hydration for Athletes with hDrop's Adria Abella

Send us Fan Mail In episode #198 host Kyla Channell talks with Adria Abella, the founder behind hDrop, the first reusable sweat-testing sensor. They break down how the device works, what it measures, and why sweat sodium, fluid loss, temperature, altitude, and intensity all matter for athletes trying to dial in hydration. They discuss practical hydration targets, what the validation data says about accuracy and reliability, and how individualized sweat testing can help athletes avoid both underdrinking and overdrinking. Adria also shares real-world examples from UTMB, seasonal changes, and even one unexpected horse use case. If you’ve ever struggled with cramps, guessed how much to drink during training, or wondered whether your hydration plan is actually working, this conversation offers practical insight into using sweat data to make better decisions. **KEY TAKEAWAYS** - Adria shares the origin story of hDrop - How hDrop makes sweat testing more practical - How the device measures key hydration markers, including fluid loss, sweat rate, sodium concentration, sodium loss, potassium, and skin temperature. - How they tested it for accuracy and reliability. Adria cites 92% accuracy for sweat loss and 87% accuracy for sodium loss over one hour of exercise. - Sweat data is highly individual. humidity, altitude, intensity, heat adaptation, season, and clothing can all affect results. - Running and cycling produce different sweat profiles - Could replacing 80% of losses may be more effective than replacing 100%? - Personalized testing can improve race-day decisions *Please note that this podcast is created strictly for educational purposes and should never be used for medical diagnosis or treatment.* **ABOUT ADRIA ABELLA, HDROP FOUNDER:** Adria Abella Villafranca is Co-Founder of hDrop Technologies Inc., the company behind hDrop, a wearable hydration sensor designed to help athletes better understand sweat, hydration, and electrolyte-related data during training and competition. hDrop brings together engineering and sports science to make sweat testing more accessible outside traditional lab settings. Adria’s goal is to bring real-world sweat insights to endurance athletes and their coaches, so they can build  more individualized hydration and fueling strategies. **FOLLOW ADRIA AND HDROP:** - **hDrop IG:** https://www.instagram.com/hdrop.tech/ - **hDrop website:** https://hdroptech.com/ref/83/ - ***Use code "HDROPNR" to save 20%*** **FREE RESOURCE** - **Sweat Testing Protocol:** https://mailchi.mp/f25c97ba0406/sweattesting **MENTIONED** - **hDrop:** https://hdroptech.com/ref/83/ (***Use code "HDROPNR" to save 20%)*** - **See hDrop at Big Sugar:** https://www.bigsugarclassic.com/ - **NeverSecond:** https://amzn.to/3SY5MGO **TIMESTAMPS** 00:00 — Meet Adria Abella and the first sweat-test sensor guest 02:23 — Why tennis cramps led to questions about hydration and sodium 06:12 — How a mechanical engineering project became hDrop 07:47 — What the hDrop sensor measures and where it is worn 09:28 — Why sensor placement changes the algorithm 10:27 — The gold standard for sweat sodium measurement 11:32 — Validation results: 92% sweat-loss accuracy and 87% sodium-loss accuracy 13:26 — Why reliability matters as much as accuracy 15:26 — Using calibration to handle outliers in real-world athletes 18:19 — Why clothing, humidity, and temperature can change sweat data 20:08 — Breathing losses at altitude and dry conditions 21:00 — How race season variables shift sweat rate and sodium trends 22:23 — Individual differences in sodium losses and intensity effects 24:17 — Broad trends by altitude, temperature, and month 25:16 — Exploring menstrual cycle and pregnancy data 27:09 — Differences in sweat response across sports 30:31 — Phone, Garmin, Hammerhead, and Wahoo integrations 32:08 — Live alerts for fluid loss and sodium loss 33:06 — Why small sips with sodium and glucose work best 34:28 — Why 80% replacement is safer than trying to replace everything 36:27 — What elite UTMB athletes tend to look like in the data 38:45 — Dehydration tolerance, cardiovascular strain, and elite performance 39:56 — Genetics, heat adaptation, and cooling strategies 41:37 — Sauna use, heat adaptation, and sodium concentration changes 42:50 — The two truths and a lie reveal 43:03 — The horse use case 44:44 — Testing nearly 100 athletes at UTMB and showing live changes 47:05 — Where to find hDrop and what’s next at Big Sugar **MORE NR** - Apply to work with Kyla → https://p.bttr.to/3ZrwzcF - Use code NEWPOD10 for 10% off our meal plans → https://nutritional-revolution.com/products/ **CONNECT**  - Instagram → www.instagram.com/nutritionalrevolution - Sponsorship inquiries → [kyla.c@nutritional-revolution.com](mailto:kyla.c@nutritional-revolution.com) - Interested in having your biomarkers or nutrigenomics checked? Email us at nutritionalrev@gmail.com **TRUSTED RESOURCES**  - Supplements (save 20%) → https://us.fullscript.com/welcome/kchannell - Feed Club ($20 off) → https://thefeed.com/teams/nutritional-revolution - Kyla's top picks → https://shopmy.us/shop/nutrev - Follow us @nutritionalrevolution