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NIGHTLY RECHARGE™ RECOVERY MEASUREMENT
Nightly Recharge™
is an overnight recovery measurement that shows you how well you recover from the demands of
your day. Your
Nightly Recharge status
is based on two components: how you slept (
sleep charge
) and how well your
autonomic nervous system (ANS) calmed down during the early hours of your sleep (
ANS charge
). Both components
are formed by comparing your last night to your usual levels from the past 28 days. Your watch automatically
measures both sleep charge and ANS charge during the night.
You can see your Nightly Recharge status on your watch and in the Polar Flow app. Based on what we've measured
from you, you get personalized daily tips in Polar Flow app on exercise, and tips on sleep and regulating your energy
levels on those particularly rough days. Nightly Recharge helps you make optimal choices in your everyday life to
maintain overall well-being and reach your training goals.
How to start using Nightly Recharge?
1. Continuous heart rate tracking needs to be enabled for Nightly Recharge to function. To
enable Continuous HR tracking go to
Settings
>
General Settings
>
Continuous HR
tracking
and choose
On
or
Night-time only
.
2. Tighten the wristband firmly around your wrist and wear the watch when you sleep. The
sensor on the back of the watch must be in constant touch with your skin. For more
detailed wearing instructions, see
Wrist-based heart rate measurement
3. You need to wear your watch for
three nights
before you start to see the Nightly
Recharge status on your watch. This is how long it takes to establish your usual level.
Before you get your Nightly Recharge you can view your sleep and ANS measurement
details (heart rate, heart rate variability and breathing rate). After three successful
nightly measurements you can see your Nightly Recharge status on your watch.
Nightly Recharge on your watch
When your watch detects that you've woken up, it will show your
Nightly Recharge status
on the Nightly Recharge
view. Navigate to the Nightly Recharge view by swiping left or right from the watch face.
The Nightly Recharge status tells you how restorative last night was. Scores for both
ANS charge
and
sleep charge
are taken into account when calculating your Nightly Recharge status. Nightly Recharge status has the following
scale: very poor – poor – compromised – OK – good – very good.
You can also stop the sleep tracking manually if you watch has not yet summarized your sleep.
Already
awake?
is shown on the Nightly Recharge view when your watch has detected a minimum of four hours
of sleep. Confirm by tapping
and the watch summarizes your Nightly Recharge instantly.
Tap
ANS charge
or
Sleep charge
to see more details.
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