Vo2 max continues to decrease even though I exercise daily
Why does my vo2 max continue to decrease? I added HIIT and long walks and it diminishes almost daily.
Question marked as
User profile for user:
DerekM87
User level:
Community Specialist
Hi Jim Harig,
We understand the concern over your V02 recordings decreasing.
If you feel this is inaccurate, we'd recommend recalibrating your Apple Watch.
After that, give the device several workouts to finish calibrating to receive updated readings.
How Apple Watch estimates your cardio fitness levels
Apple Watch Series 3 or later can record an estimate of your VO2 max using the heart and motion sensors during an outdoor walk, run, or hike. It can also estimate your VO2 max if you start an outdoor walk, run, or hike in the Workout app. Apple Watch supports a VO2 max range of 14-60 mL/kg/min that is validated for users 20 years or older.
To estimate your cardio fitness level, your Apple Watch also takes into account your:
Age
Sex
Weight
Height
Medications that might affect your heart rate
It can take at least 24 hours wearing your Apple Watch, followed by several workouts* and passive measurements with your Apple Watch before you receive an initial estimate.
*Push workouts are not supported.
Set up Cardio Fitness Levels - Apple Support
Should the issue persist or you feel the readings are inaccurate, reach out to Apple Support directly.
Cheers!