Nightly Skin Temperature - Polar Electro Vantage V3 User Manual

you've ended up staying up late, you should rather compensate that with a nice early afternoon nap instead of
sleeping in.
Scientific background
Polar SleepWise feature utilizes sleep tracking and biomathematical modeling for predicting daytime alertness based
on how one has slept recently. To predict how sleep boosts one's alertness, Polar model evaluates sleep amount,
quality, and timing against personal sleep need and one's body's internal circadian rhythm. The model predicts one's
boost levels hour-by-hour, daily boost score, sleep gate, and sleep window. A sleep gate marks the start of one's sleep
window - the time when one's body would naturally want to be asleep. It takes from 1 to 2 weeks for SleepWise to
collect enough data to reach full reliability.
Biomathematical modeling is a generally accepted means to predict how different sleep schedules impact on
alertness during waking hours. Several biomathematical models have been introduced in the scientific literature.
While the details and terminology between the models differ, the models typically consider time awake, sleep-wake
history, and the circadian rhythm. The outputs of the models have typically been validated against a psychomotor
vigilance task after modest or severe sleep restrictions. The psychomotor vigilance task is a simple task where one
presses a button as soon as the light appears on a screen. Results from such a task correlate with maintaining
attention, problem solving, and decision making.

NIGHTLY SKIN TEMPERATURE

The Nightly Skin Temperature measurement automatically tracks your skin temperature when you sleep. It then
compares the result with your 28-day average, and shows the variation to that average. Tracking the variations in your
skin temperature can help you detect changes in your body's state.
In contrast to core body temperature, which is usually quite stable around +37 degrees Celsius (98.6 °F), the
temperature of your skin can vary much more. This is because the body regulates its core temperature through
changing the blood flow of the skin. Also, environmental factors affect the skin temperature. A variation of +-1 degrees
Celsius / +-1.8 degrees Fahrenheit is considered usual in skin temperature. Lower temperatures can occur quite often
due to environmental factors, such as colder room temperature or sleeping with your hand outside the covers. Higher
temperatures might be a sign of oncoming illness. Higher temperatures can also indicate being in the latter part of the
menstrual cycle (ovulation and luteal phase).
The skin temperature feature can't be used as a thermometer, as it doesn't show any absolute temperature values, only
the variation to your average skin temperature. If you're feeling under the weather, double-check your temperature with
a thermometer.
The temperature measurement feature and data is not intended for medical purposes, diagnosis or
treatment.
How to start using the Nightly skin temperature feature
1. Continuous heart rate tracking needs to be enabled for Nightly skin temperature
2. Tighten the wristband firmly around your wrist and wear the watch when you sleep. For
3. You need to wear your watch for three nights before you start to see your Nightly skin
Nightly skin temperature on your watch
When your watch detects that you have woken up, it compares the skin temperature measured during sleep to your
average skin temperature, and shows the variation to that average. Navigate to the
measurement to function. To enable Continuous HR tracking go to Settings > General
Settings > Continuous HR tracking and choose
detailed wearing instructions, see
temperature results on your watch. After three nights, we know your average skin
temperature and show it as baseline (zero). When calculating the baseline, the past 28
nights are taken into account.
On or Night-time
Wrist-based heart rate measurement.
Nightly skin temperature
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