User Manual

• At least two times per week, run or ride outdoors with a
power meter, and reach a heart rate higher than 70% of your
maximum heart rate for at least 10 minutes.
After using the device for one week, your training status
should be available.
• Record all of your fitness activities on this device, or enable
the Physio TrueUp
™
feature, allowing your device to learn
about your performance (Syncing Activities and Performance
Measurements, page 11).
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 fēnix 5X device requires wrist-
based heart rate or a compatible chest heart rate monitor to
display your VO2 max. estimate. The device has separate VO2
max. estimates for running and cycling. You must run either
outside with GPS or ride with a compatible power meter at a
moderate level of intensity for several minutes to get an
accurate 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
Orange Fair
Red Poor
VO2 max. data is provided by FirstBeat. VO2 max. analysis is
provided with permission from The Cooper Institute
®
. For more
information, see the appendix (VO2 Max. Standard Ratings,
page 35), and go to www.CooperInstitute.org.
Getting Your VO2 Max. Estimate for Running
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 device (Pairing
Your Wireless Sensors, page 28). If your fēnix 5X device was
packaged with a heart rate monitor, the devices are already
paired.
For the most accurate estimate, complete the user profile setup
(Setting Up Your User Profile, page 14), and set your
maximum heart rate (Setting Your Heart Rate Zones, page 14).
The estimate may seem inaccurate at first. The device requires
a few runs to learn about your running performance.
1
Run for at least 10 minutes outdoors.
2
After your run, select Save.
3
Select UP or DOWN to view the performance widget.
4
Select to scroll through the performance measurements.
Getting Your VO2 Max. Estimate for Cycling
This feature requires a power meter and wrist-based heart rate
or a compatible chest heart rate monitor. The power meter must
be paired with your fēnix 5X device (Pairing Your Wireless
Sensors, page 28). If you are using a chest heart rate monitor,
you must put it on and pair it with your device. If your fēnix 5X
device was packaged with a heart rate monitor, the devices are
already paired.
For the most accurate estimate, complete the user profile setup
(Setting Up Your User Profile, page 14) and set your maximum
heart rate (Setting Your Heart Rate Zones, page 14). The
estimate may seem inaccurate at first. The device requires a few
rides to learn about your cycling performance.
1
Ride at a steady, high intensity for at least 20 minutes.
2
After your ride, select Save.
3
Select UP or DOWN to view the performance widget.
4
Select to scroll through the performance measurements.
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: 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.
Viewing Your Recovery Time
For the most accurate estimate, complete the user profile setup
(Setting Up Your User Profile, page 14), and set your
maximum heart rate (Setting Your Heart Rate Zones, page 14).
1
Go for a run.
2
After your run, select Save.
The recovery time appears. The maximum time is 4 days.
NOTE: From the watch face, you can select UP or DOWN to
view the performance widget, and select to scroll through
the performance measurements to view your recovery time.
Recovery Heart Rate
If you are training with wrist-based heart rate or a compatible
chest heart rate monitor, you can check your recovery heart rate
value after each activity. Recovery heart rate is the difference
between your exercising heart rate and your heart rate two
minutes after the exercise has stopped. For example, after a
typical training run, you stop the timer. Your heart rate is
140 bpm. After two minutes of no activity or cool down, your
heart rate is 90 bpm. Your recovery heart rate is 50 bpm (140
minus 90). Some studies have linked recovery heart rate to
cardiac health. Higher numbers generally indicate healthier
hearts.
TIP: For best results, you should stop moving for two minutes
while the device calculates your recovery heart rate value. You
can save or discard the activity after this value appears.
Training Load
Training load is a measurement of your training volume over the
last seven days. It is the sum of your excess post-exercise
oxygen consumption (EPOC) measurements for the last seven
days. The gauge indicates whether your current load is low,
high, or within the optimal range to maintain or improve your
fitness level. The optimal range is determined based on your
individual fitness level and training history. The range adjusts as
your training time and intensity increase or decrease.
12 Heart Rate Features