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ANS charge details in the Flow app
Sleep charge details in Polar Flow
For sleep charge information in the Polar Flow app, see "Sleep data in the Flow app and web service" on page 61.
Personalized tips in the Flow app
Based on what we've measured from you, you get personalized daily tips in the Polar Flow app on exercise, and tips on
sleep and regulating your energy levels on those particularly rough days. Tips for the day are displayed on the opening
ANS charge gives you information on how well your autonomic nervous system
(ANS) calmed down during the night. The scale is from -10 to +10. Around zero is
your usual level. The ANS charge is formed by measuring your heart rate, heart
rate variability and breathing rate during roughly the first four hours of sleep.
A normal heart rate value for adults can range between 40 and 100 bpm. It is
common for your heart rate values to vary between nights. Mental or physical
stress, exercising late at night, illness, or alcohol can keep your heart rate up during
the early hours of your sleep. It's best to compare your last night's value to your
usual level.
Heart rate variability (HRV) refers to the variation between successive heart
beats. In general, high heart rate variability is linked to general good health, high
cardiovascular fitness and resilience to stress. It can vary greatly from person to
person, ranging from 20 to 150. It's best to compare your last night's value to your
usual level.
Breathing rate shows your average breathing rate during roughly the first four
hours of sleep. It is calculated from your beat-to-beat interval data. Your beat-to-
beat intervals shorten when you breathe in and lengthen when you breathe out.
During sleep, breathing rate slows down and varies mainly along with sleep stages.
Typical values for a healthy adult at rest range from 12 to 20 breaths per minute.
Higher values than usual may indicate a fever or impending illness.
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