Zone
% of
Maximum
Heart Rate
Perceived
Exertion
Benefits
4
80–90%
Fast pace and a
bit uncomfort
able, breathing
forceful
Improved
anaerobic
capacity and
threshold,
improved speed
5
90–100%
Sprinting pace,
unsustainable for
long period of
time, labored
breathing
Anaerobic and
muscular
endurance,
increased power
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 cardiovascular strength and
should increase as your level of fitness improves. The
D2 Air X10 watch requires wrist-based heart rate or a
compatible chest heart rate monitor to display your VO2
max. estimate.
On the watch, your VO2 max. estimate appears as
a number and description. On your Garmin Connect
account, you can view additional details about your VO2
max. estimate.
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 39
), and go to
Getting Your VO2 Max. Estimate
This feature requires wrist-based heart rate or a
compatible chest heart rate monitor. If you are using a
chest heart rate monitor, you must put it on and pair it with
your watch (
Pairing Your Wireless Sensors, page 33
).
For the most accurate estimate, complete the user profile
setup (
Setting Up Your User Profile, page 11
), and set
your maximum heart rate (
Setting Your Heart Rate Zones,
). The estimate may seem inaccurate at first. The
watch requires a few runs to learn about your running
performance.
1 Hold .
2 Select > User Profile > VO2 Max.
If you have already recorded a brisk walk or run
outdoors, your VO2 max. estimate may appear. The
watch displays the date your VO2 max. estimate
was last updated. The watch updates your VO2 max.
estimate each time you complete an outdoor walk or
run of 15 minutes or longer. You can manually start a
VO2 max. test to get an updated estimate.
3 To start a VO2 max. test, tap the screen.
4 Follow the on-screen instructions to get your VO2 max.
estimate.
A message appears when the test is complete.
Viewing Your Fitness Age
Your fitness age gives you an idea of how your fitness
compares with a person of the same sex. Your watch uses
information, such as your age, body mass index (BMI),
resting heart rate data, and vigorous activity history to
provide a fitness age. If you have a Garmin Index
™
scale,
your watch uses the body fat percentage metric instead of
BMI to determine your fitness age. Exercise and lifestyle
changes can impact your fitness age.
NOTE: For the most accurate fitness age, complete the
user profile setup (
Setting Up Your User Profile, page 11
).
1 Hold .
2 Select User Profile > Fitness Age.
Pulse Oximeter
The D2 Air X10 watch has a wrist-based pulse oximeter
to gauge the saturation of oxygen in your blood. Knowing
your oxygen saturation can be valuable in understanding
your overall health and help you determine how your body
is adapting to altitude. Your watch gauges your blood
oxygen level by shining light into the skin and checking
how much light is absorbed. This is referred to as SpO
2
.
On the watch, your pulse oximeter readings appear as
an SpO
2
percentage. On your Garmin Connect account,
you can view additional details about your pulse oximeter
readings, including trends over multiple days (
the Pulse Oximeter Tracking Mode, page 15
). For
more information on pulse oximeter accuracy, go to
.
Getting Pulse Oximeter Readings
You can manually begin a pulse oximeter reading from the
pulse oximeter glance. The accuracy of the pulse oximeter
reading can vary based on your blood flow, the watch
placement on your wrist, and your stillness.
NOTE: You may need to add the pulse oximeter glance to
the glance loop (
Customizing the Glances, page 17
).
1 While you are sitting or inactive, swipe up or down to
view the pulse oximeter glance.
2 Select the glance to begin the reading.
3 Hold the arm wearing the watch at heart level while the
watch reads your blood oxygen saturation.
4 Keep still.
The watch displays your oxygen saturation as a
percentage, and a graph of your pulse oximeter
readings and heart rate values since midnight.
14
Heart Rate Features
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