Viewing The Weather Glance; Menstrual Cycle Tracking; Using The Stress Level Glance; Performance Measurements - Garmin FORERUNNER 255 Series Owner's Manual

3 Press DOWN to view your average resting heart rate
values for the last 7 days.

Viewing the Weather Glance

Weather requires a Bluetooth connection to a
compatible phone.
1 From the watch face, select UP or DOWN to view
the weather glance.
2 Select START to view weather details.
3 Select UP or DOWN to view hourly, daily, and
weather trend data.

Menstrual Cycle Tracking

Your menstrual cycle is an important part of your
health. You can use your watch to log physical
symptoms, sex drive, sexual activity, ovulation days,
and more. You can learn more and set up this feature in
the Health Stats settings of the Garmin Connect app.
y Menstrual cycle tracking and details
y Physical and emotional symptoms
y Period and fertility predictions
y Health and nutrition information
NOTE: You can use the Garmin Connect app to add and
remove glances.

Using the Stress Level Glance

The stress level glance displays your current stress
level and a graph of your stress level for the last several
hours. It can also guide you through a breathing activity
to help you relax (Customizing the Glance Loop, page
9).
1 While you are sitting or inactive, press UP or DOWN
to view the stress level glance.
2 Press START.
3 Select an option:
• Press DOWN to view additional details.
TIP: Blue bars indicate periods of rest. Orange
bars indicate periods of stress. Gray bars
indicate times when you were too active to
determine your stress level.
• Press START to start a Breathwork activity.

Performance Measurements

These performance measurements are estimates
that can help you track and understand your training
activities and race performances. The measurements
10
require a few activities using wrist-based heart rate
or a compatible chest heart rate monitor. Cycling
performance measurements require a heart rate
monitor and a power meter.
These estimates are provided and supported by
Firstbeat Analytics. For more information, go to
com.sg/minisite/garmin-technology/running/.
NOTE: The estimates may seem inaccurate at first. The
watch requires you to complete a few activities to learn
about your performance.
VO2 max�: VO2 max. is the maximum volume of
oxygen (in milliliters) you can consume per minute
per kilogram of body weight at your maximum
performance (About VO2 Max. Estimates, page
10).
Predicted race times: The watch uses the VO2 max.
estimate and your training history to provide a
target race time based on your current state of
fitness (Viewing Your Predicted Race Times, page
11).
HRV status: The watch analyzes your wrist heart rate
readings while you are sleeping to determine your
heart rate variability (HRV) status based on your
personal, long-term HRV averages
Variability Status, page
Performance condition: Your performance condition
is a real-time assessment after 6 to 20 minutes of
activity. It can be added as a data field so you can
view your performance condition during the rest of
your activity. It compares your real-time condition to
your average fitness level
page 12).
Functional threshold power (FTP): The watch uses
your user profile information from the initial setup
to estimate your FTP. For a more accurate rating,
you can conduct a guided test
Estimate, page 12).
Lactate threshold: Lactate threshold requires a chest
heart rate monitor. Lactate threshold is the point
where your muscles start to rapidly fatigue. Your
watch measures your lactate threshold level using
heart rate data and pace
13).

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. 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.
Garmin.
(Heart Rate
12).
(Performance Condition,
(Getting Your FTP
(Lactate Threshold, page
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