NEW – Korr Medical CardioCoach VO2 Max and Metabolic Efficiency “FatMax” testing now available in Chicago!
Precision Matters. Does your heart rate monitor or smart watch reflect your true metabolism? Now you can dial in lab-grade precision of your unique fat vs. carb metabolism just like a professional athlete, and see it in real-time on your cell phone or Garmin watch with the newly updated Korr Medical CardioCoach app!
By completing a Metabolic Test with 4 Star Endurance, you can now get your unique Fat vs. Carb metabolic profile loaded directly on your Phone and your Garmin watch for greater precision with heart rate based training. Improving your endurance sports performance through precision and train like a professional athlete!
BOOK YOUR TEST TODAY or learn more below…

NOTE: To ensure accuracy of your carb vs. fat metabolic profile, you’ll first need to complete a “long VO2” test, also known as a Metabolic Efficiency Point (MEP) or “FatMax” test. This is a specific type of “metabolic economy” VO2 test, that we typically conduct as a second tier “level 2” test after you’ve already set up your heart rate training zones by doing a baseline VO2 Max Test. While a standard “VO2 MAX” test result can be imported into the CardioCoach app, the accuracy of fat vs. carb metabolism at specific heart rates during long endurance events requires testing after a longer 6-12 hour fasting period where you ride or run for several minutes at each effort level (rather than a 2-3hr fast and 1-minute steps more typical of standard VO2 Max tests). While you can definitely use a well-administered VO2 Max test’s carb vs. fat metabolic profile as a starting point, just know the “FatMax” accuracy may not be precise enough to accurately plan fueling for events such as marathons and Iron-distance triathlons with precision unless you conduct a true MEP “FatMax” test..
Once you’ve received your metabolic test from us with a Korr CardioCoach PIN number, you can download the “CardioCoach” App on your Phone, or the “CardioCoach Workout” App on your Garmin to import your test results!

“CardioCoach” App – install this app on any iOS or Android device and simply click on the three bar “menu” icon and select TEST RESULTS, then click on the green IMPORT button where you’ll input your EMAIL and PIN number. Then select WORKOUT or START WORKOUT, pick a workout type, start the workout, and click on the FUEL toggle to see your live data!

“CardioCoach Workout” App (Garmin) – the CardioCoach app is also now available (as a beta) on Garmin watches! If you’re not familiar with how to install apps on your Garmin, follow these instructions from Garmin Support Forums below. Note that you’ll need to install the “CardioCoach Workout” app first, and then enter your email and PIN number in the application’s “SETTINGS” to import your profile. The SETTINGS menu can be found using the Garmin Connect Phone App, Garmin Express PC app, or the Garmin ConnectIQ Store app by following these instructions: https://forums.garmin.com/developer/connect-iq/w/wiki/14/changing-connect-iq-app-settings

STEP 1 – Install the “CardioCoach Workout” App using the Garmin “Connect IQ” store or “Connect” app: https://apps.garmin.com/en-US/apps/2a2aa14a-22b1-4435-8096-aa2e9fb292bb
STEP 2 – Sync your watch to ensure the app is fully installed (Tip: on most newer Garmin watches, hold top left button for a couple seconds, then scroll down to select “SYNC”)
STEP 3 – Go to the application’s SETTINGS and input your EMAIL and PIN number. You can ignore the other settings for now, unless you want to copy these below:

- Can’t find this? To find this via the Garmin “ConnectIQ” phone app…
… go to “My Device” -> “My Device Apps” -> “CardioCoach Workout” -> “Settings” - or, via the Garmin “CONNECT” phone app…
… go to MENU -> “DEVICES” (select your device) -> “Activities, Apps & More” -> “Activities & Apps“-> “CardioCoachWorkout” -> “Settings“

STEP 4 – Ready to try it? From the main screen of your watch, click START button on your watch, then scroll down to select the “CardioCoachWorkout” app (instead of selecting a sport mode like Running or Cycling)!
STEP 5 – Click “START” and then “START” again to start your workout (or scroll and play around with the settings first if you want to select a sport type, interval workout type, etc. before you click on start)!
STEP 6 – Click DOWN button (button left button on your watch) to see your live Fat vs. Carb data. Complete your workout and then save your workout to see your detailed summary data and graphs in the Garmin Connect phone app or website!



NOTE: Other Garmin ConnectIQ apps can be manually adjusted with your metabolic profile so that you can record fat vs. carb data without using the CardioCoach App. Below are a list of apps & data fields we found that you can try, but note that features may change over time:
Garmin ConnectIQ Apps & Data Fields

- FatBurner (Data Field)
(this is not a full app, but rather a “DATA FIELD” that works on both Garmin watches and bike computers – see their instructions for how to set up. Note that you’ll need to manually enter your raw data from VO2 test report for this to work. For help, please schedule a 1on1 consultation with us or sign up for Private Coaching for additional assistance. Setting this up for you is included for free with any “MEP” test or private coaching package and will enable your Garmin to show this type of data in all your future workouts with precision dialed in to your unique metabolism so that you can more accurately plan fueling needs for long distance events like marathons and iron distance triathlons:


NOTE: Images from “FatBurner” Garmin ConnectIQ app
- Fat/Carb Combustion Monitor (DATA FIELD for fat/carb based on wattage – so for cycling only)
- FatPolice (DATA FIELD – this can be setup to show “% of Fat” data field)
- Fat Usage Monitor / Glycogen Usage Calculator (DATA FIELDS)
- MyZone MEPS (unrelated to Fat vs. Carb, but a nice data field to have for MyZone users)