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About VO2 Max. Estimates
VO2 max. is the maximum volume of oxygen (in milliliters) you can consume per minute per kilogram of body
weight at your maximum performance. In simple terms, VO2 max. is an indication of athletic performance and
should increase as your level of fitness improves. The Forerunner device requires wrist-based heart rate or a
compatible chest heart rate monitor to display your VO2 max. estimate.
On the device, your VO2 max. estimate appears as a number, description, and position on the color gauge. On
your Garmin Connect account, you can view additional details about your VO2 max. estimate, including your
fitness age. Your fitness age gives you an idea of how your fitness compares with a person of the same gender
and different age. As you exercise, your fitness age can decrease over time.
Purple
Superior
Blue
Excellent
Green
Good
Yellow
Fair
Red
Poor
VO2 max. data is provided by Firstbeat Analytics. VO2 max. analysis is provided with permission from The
Cooper Institute
®
. For more information, see the appendix (VO2 Max. Standard Ratings, page 44), and go to
www.CooperInstitute.org.
Recovery Time
You can use your Garmin device with wrist-based heart rate or a compatible chest heart rate monitor to display
how much time remains before you are fully recovered and ready for the next hard workout.
NOTE: This feature is available only on the Forerunner 45 Plus device.
NOTE: The recovery time recommendation uses your VO2 max. estimate and may seem inaccurate at first. The
device requires you to complete a few activities to learn about your performance.
The recovery time appears immediately following an activity. The time counts down until it is optimal for you to
attempt another hard workout.
Heart Rate Features 21
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