Hmm… how do you know Apple Watch my heart rate? Why they glow selenamarie with a pair of green “lanterns” on the back side of the Apple Watch to determine the pulse? It turns out, Yes.

In this article we will explain how the Apple Watch will determine the pulse, why would you need this an opportunity to improve the accuracy of measurements and to monitor the health of hours.

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Not clear to me how Apple Watch actually determine the pulse?!

That’s it for this they glow green.

Apple Watch built-in heart rate monitor works on the principle of photoplethysmography. What is it?

Photoplethysmogram detects blood flow by means of two elements: the flickering of the led and photodiode that reads the reflection.

With each heart beat volume of blood in the wrist increases, and between the bumps is reduced.

The blood absorbs green light and reflects red. A couple of the Apple Watch LEDs blink at a speed several hundred times per minute, and two photodiodes record the amount of reflected light.

So they catch the pulse and can distinguish between a range of heart rate from 30 to 210 beats per minute.

If the clock is hanging too loose, they automatically increase the brightness of the LEDs and the blink rate.

Interesting fact: when the Apple Watch monitor heart rate in the background, they switch the photodiodes to the infrared radiation. We don’t see it.

I wonder how to find your pulse right now?

Nothing could be simpler:

1. Put on your Apple Watch, if they are not on the wrist.

2. Open the program “Pulse” on the Apple Watch.

3. Wait until the clock finishes the measurement.

With this app you will be able to measure heart rate when resting and walking* do breathing exercises, exercise and recover after exercise.

If you need quick access to the “Pulse”, add it to the favorites list in the Dock, the Apple Watch (via iPhone) or print the label on the dial.

And health problems the Apple Watch is determined by the pulse?

Yes! This is an important feature of hours.

The Apple Watch monitor heart rate — tachycardia. This symptom appears during poisoning, fevers, endocrine diseases and problems of the heart.

When you are at rest, the heart beats faster specified limit within 10 minutes, the watch report*.

Enable this feature:

1. Run the Watch app on the iPhone.

2. Open The “Pulse”.

3. Go to “High pulse”.

4. Make sure to limit heart rate at rest in the interval from 100 to 150 beats per minute.

To determine the normal heart rate in a relaxed state, the start Pulse, when totally relaxed. Or use an intermediate value that identified the application “Pulse”.

But note that these data might be distorted if you have recently taken drugs, eating dark chocolate, drinking coffee.

* the first Apple Watch, which began selling in 2015, do not determine the heart rate at rest and during the walk, doesn’t support notifications about elevated pulse.

Is training there a real benefit?

If you exercise regularly, be sure to use the application “Training” on the Apple Watch.

During physical activity the watch continuously determine heart rate and the heart rate monitor does not turn off 3 minutes after ending the activity.

Apple Watch joins the pulse and other data to estimate the number of calories that managed to burn.

What about accuracy: the Apple Watch is not really deceived?

Apple Watch is not a professional medical device. Therefore, they can only give recommendations. If you received a notification about elevated heartbeat, consult your doctor.

How to improve the accuracy of heart rate monitor Apple Watch?

1. Place the Apple Watch on the upper side of the wrist. The watch is not designed to read information from the bottom.

2. When doing sports or simply measure the heart rate, tighten the strap tighter. But it must not press on the hand, so as not to distort readings.

This is enough to heart rate monitor showed the most accurate values.

That’s about it. Now you will not be surprised when your watch suddenly flickered green. They just monitor your heart rate.

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