NYX Endurance

How to Use the New Gx Sweat Patch

https://www.gatorade.com/gx/sweatpatch

WHY THIS IS SUCH AN EXCITING NEW PRODUCT
  • Previously there was no way to do an at-home hydration test that ALSO measures your sodium concentration
  • Sodium concentrations are highly individual and vary WIDELY
  • For long-course racing, getting your fluid replacement and sodium replacement rates dialed in correctly can be the difference between a great day and a lousy one

BEFORE YOU USE YOUR FIRST PATCH
  • Download the app (currently iOS only)
  • Create an account in the app
  • Connect TrainingPeaks/Strava/Zwift etc so that your completed workouts show up instantaneously in the Gatorade app

USING THE GX PATCH
  • Select a 60-min (or so) workout that will accurately mimic race-day conditions (indoor bikes and outdoor runs and bikes in warm conditions are good options)
  • Before starting the workout, apply the patch to your inner forearm
  • Workout as usual (to be able to calculate net fluid loss, track your fluid intake during the workout)
  • Immediately upon completing the workout, open the Gatorade app
    • You should see your completed workout upon opening the app
    • Click “Scan Sweat Patch” 
    • The app will scan your patch using the camera on your phone and then process the sweat patch
    • It’ll ask a few questions about workout intensity and fluid intake, then calculate results
    • TAKE SCREEN SHOTS OF THE RESULTS as they are nearly impossible to find in the future
  • After you’ve been given the results, scroll back to the workout and open it up to see the results again (I found this provides slightly different information) and TAKE SCREEN SHOTS OF THAT TOO

APPLYING THE RESULTS OF THE SWEAT TEST
  • You care about two pieces of data
    • Fluid loss during the workout, in ounces
    • Sodium loss during the workout, in mg
  • This will give your RATE of fluid loss in oz/hour and the RATIO of mg sodium to oz of fluid that you should use when replacing fluids/electrolytes
  • As an example:
    • You completed a 1 hour indoor bike workout, and consumed 16 oz of water during the workout
    • The Gx patch results indicate 24 oz of fluid loss (8 oz net loss accounting for the 16 oz you drank) and 500mg of sodium loss
    • In the future, for workouts in similar conditions, you should consume
      • 24 oz of water per hour (about 1 bike bottle) – your sweat rate
      • And 500mg of sodium per 24 oz of water – your sodium ratio
  • Keep in mind that your sweat rate varies based on the climate, so multiple tests can help to understand how to adjust your replacement rate based on temperature and humidity
  • If your fluid replacement rate changes, your sodium intake should change proportionately so that the ratio remains the same
    • Referring back to the example above, if you need 24 oz of water per hour with 500mg of sodium on a 70 degree day, you might need 36 oz of water per hour with 750mg of sodium on a 90 degree day
    • You’ll still have 500mg of sodium in each 24 oz bike bottle of water, you’ll just need to drink 1.5 bottles per hour instead of 1 bottle per hour

NYX Endurance

Our mission is to develop an endurance community that empowers each member towards both individual and collective potential. At NYX Endurance, we believe in the relentless pursuit of better. We believe there is no success without suffering. There is no progress without perseverance. There is no light without darkness. #embracethedarkness
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