Garmin FORERUNNER 955, Owner'S Manual

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Heart Rate Variability Status
Your watch analyzes your wrist heart rate readings while you are sleeping to determine your heart rate variability
(HRV). Training, physical activity, sleep, nutrition, and healthy habits all impact your heart rate variability. HRV
values can vary widely based on gender, age, and fitness level. A balanced HRV status may indicate positive
signs of health such as good training and recovery balance, greater cardiovascular fitness, and resilience to
stress. An unbalanced or poor status may be a sign of fatigue, greater recovery needs, or increased stress. For
best results, you should wear the watch while sleeping. The watch requires three weeks of consistent sleep data
to display your heart rate variability status.
Color Zone Status Description
Green
Balanced Your seven-day average HRV is within your baseline range.
Orange Unbalanced Your seven-day average HRV is above or below your baseline range.
Red
Low Your seven-day average HRV is well below your baseline range.
No color
Poor
No status Your HRV values are averaging well below the normal range for your age.
No status means that there is insufficient data to generate a seven-day average.
You can sync your watch with your Garmin Connect account to view your current heart rate variability status,
trends, and educational feedback.
Performance Condition
As you complete your activity, such as running or cycling, the performance condition feature analyzes your pace,
heart rate, and heart rate variability to make a real-time assessment of your ability to perform compared to your
average fitness level. It is approximately your real-time percentage deviation from your baseline VO2 max.
estimate.
Performance condition values range from -20 to +20. After the first 6 to 20 minutes of your activity, the device
displays your performance condition score. For example, a score of +5 means that you are rested, fresh, and
capable of a good run or ride. You can add performance condition as a data field to one of your training screens
to monitor your ability throughout the activity. Performance condition can also be an indicator of fatigue level,
especially at the end of a long training run or ride.
NOTE: The device requires a few runs or rides with a heart rate monitor to get an accurate VO2 max. estimate
and learn about your running or riding ability (
About VO2 Max. Estimates, page 26 ).
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