How To Measure Heart Rate With Apple Watch

The best function of Apple Watch is that it can measure your heart rate with its photodiode sensors. To measure your heart beat just wear it on your any wrist, not too tight and not too loose and ready to monitor your hear beats at any time. Tracking the heart beat during workouts is essential as you can maintain overall good heart rate without getting too tired.

In this tutorial I am going to teach you how you can measure your heart rate with Apple Watch and what technology works in this watch which lets it to monitor your pulse.

Before you begin you need to pair your Apple Watch with your iPhone 5/iPhone 6, Read This Article.

How Does Apple Watch Measures Your Hear Rate

The principle is simple, we know that human blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights paired with light‑sensitive photodiodes to detect the amount of blood flowing through your wrist at any time. When your heart beats, the blood flow in your wrist and the green light absorption is greater. By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute. This technology is called photoplethysmography.

Apple Watch Heart Rate sensors

The Apple Watch uses Infra Red lights when it measures your heart rate every 10 minutes. However, if the infrared system isn’t accurate then, Apple Watch switches to the green LEDs. In addition, the heart rate sensor is designed to compensate for low signal levels by increasing both LED brightness and sampling rate.

How To Measure Heart Rate With Apple Watch

  • On your Apple Watch swipe up on the watch face to open Glances, now either swipe left or right to find the heart rate glance.
  • Alternatively open the Workout App and tap 'activity', swipe left or right to see your heart rate.
Problem With Tattoos

Apple has recently confirmed that tattoos can affect apple watch’s heart rate sensor readings. So people having tattoos on their wrists will not get right heart rate readings, because the ink, color and saturation of the tattoos will block the light of hear rate sensors so that they can't measure your pulse correctly. For these people Apple recommends connecting their Apple Watch to external heart rate sensors via Bluetooth.

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