We Measured Our Sweat Loss During a 1-Hour Swim - The Results Are Shocking

It’s one of the most common questions in endurance sports: Do you actually sweat while you're surrounded by water? More importantly, if you*are sweating, how much fluid are you losing and is it sabotaging your triathlon performance? To find out, the GTN team and a group of volunteers headed to the pool for a controlled scientific test. With the help of Chris (aka "Minty") from Precision Fuel & Hydration, we weighed ourselves before and after a high-intensity, one-hour swim session to see exactly how much "invisible" weight we lost. From swimming in a wetsuit to comparing "heavy sweaters" vs. "low sweaters," we break down the physiological reasons why your body continues to sweat even when the water is cooling your skin. We also discuss why the "thirst response" lags in the water and how you should adjust your hydration strategy for your next IRONMAN or 70.3. 0:00 Do You Actually Sweat While Swimming? 0:31 The Test Subjects & Methodology 01:00 The Conditions: Temperature & Intensity 01:34 James vs. The Wetsuit: A Recipe for Overheating? 02:11 Why the Body Sweats in Water 04:35 Analysing the Results: Who Lost the Most Fluid? 06:07 Land vs. Water: Comparing Your Sweat Rates 07:54 The Thirst Lag: Why You Don't Feel Dehydrated 09:25 Hydration Strategy for Triathletes (Pre-Race & Bike Leg) 10:43 Transitioning to Land: Why You Sweat Post-Swim 11:50 Rehydrating for Endurance Swims 12:44 Final Verdict: Don't Drink the Pool Water! Join this channel to get access to perks: https://www.youtube.com/@gtn/join Useful Links Join GTN YouTube Memberships 👉 https://gtn.io/JoinGTNmemberships Subscribe so you don’t miss a thing 👉 https://gtn.io/subscribe Submit your Photo and Video to us 👉 https://gtn.io/UPLOAD Check out the GTN Shop 👉 https://gtn.io/TeamKit GTN Training Plans 👉 https://gtn.io/qonrQw Insurance: Viewers in the USA and UK can explore Insurance products 👉 https://gtn.io/insurance Be honest—did you think you didn't sweat in the pool, or have you always felt that post-swim 'invisible' thirst? 🏊‍♂️💦 After seeing these results, are you going to change how you hydrate before your morning swim blocks? Let's discuss in the comments! 👇 Watch more on GTN... 📹 https://youtu.be/KMliGnl7uVo 📹 Watch our Editor’s Choice Playlist 👉 https://gtn.io/editorschoice 📹 Watch our weekly show, The GTN Show 👉 https://gtn.io/GTNshowPlaylist Photos: © Triathlon / Getty Images 🎵 Music - licensed by Epidemic Sound 🎵 Club Soda - Martin Baekkevold Ferris Wheel (Indie Rock Version) - Heyday Highway Hard-Hearted Baby (Indie Rock Version) - Dez Moran High Tech - Rocket Jr RSP - PW The Thrill (Instrumental Version) - Gamma Skies #gtn #triathlon #swimbikerun #swim #bike #run #swimming #sweat #hydration #test #temperature #water #overheating #dehydration The Global Triathlon Network (GTN) is the world's biggest triathlon YouTube channel, with new videos every day! GTN is for anyone who loves triathlon: from seasoned triathletes to first-timers – and everyone in between! With the help of our former pro and Olympic medal-winning team, we’re here to inform, entertain and inspire you to become a better triathlete; including videos on: - How to swim, bike, and run faster with expert knowledge - Try our session ideas - Investigations into wide-ranging topics - The best triathlon bike tech and gear with pro-know-how - In-depth, entertaining features from the heart of the sport - Chat, opinion and interact with us across the channel and on social media! Join us on YouTube’s best triathlon channel to get closer to the sport and to become a better, faster and fitter triathlete! Welcome to the Global Triathlon Network. Thanks to our sponsors: Canyon: http://gtn.io/canyon-bikes Ryzon: https://gtn.io/ryzon Ergon: https://gtn.io/Ergon ON Running: http://gtn.io/On-Running Orca: http://gtn.io/Orca Precision Fuel & Hydration: https://gtn.io/PrecisionHydration Roka: https://gtn.io/Roka Silca: https://gtn.io/silca Watch our sister channels: Global Cycling Network - https://www.youtube.com/@gcn GCN Tech - https://www.youtube.com/@gcntech GCN Racing - https://www.youtube.com/@gcnracing GCN Italia - https://www.youtube.com/@gcnitalia GCN en Espanol - https://www.youtube.com/@gcnenespanol GCN auf Deutsch - https://www.youtube.com/@gcnaufdeutsch GCN en Francais - https://www.youtube.com/@gcnenfrancais GCN Training - https://www.youtube.com/@GCNTraining Global Mountain Bike Network - https://youtube.com/@gmbn GMBN Racing - https://www.youtube.com/@gmbnracing GMBN Tech - https://www.youtube.com/@gmbntech Electric Mountain Bike Network - https://www.youtube.com/@embn