How to Use the Apple Watch Heart Rate Sensor

What gets the Apple watch different from other smartwatches? Well, Apple watch not only renders an exact time and advise you of your messages and calls but also can advise you about your heart rate.

This is possible through its Heart Rate Sensor App. Isn’t it simply amazing? With this app, it can track your fitness and health and warn you of any exigencies. So, how this watch works? The following is a guide that you can meditate on how the Apple Watch heart rate sensor works.

What is the Apple Watch Heart Rate Sensor?


Technology today is so innovative that a watch can even monitor your heart rate. This is attained through the Apple Watch Heart Rate Sensor, which an app in your Apple Watch that can measure your heart rate throughout the day as long as you have worn your Apple Watch along your wrist.

Likewise, it can also view and notify you of your breath, resting, workout, recovery rates, and walking in the entire day. Simply, you can assure your heart rate in just a glance.

Why is it significant to know your heart rate?

And then, why is it important to know your heart rate? It is defined that heart rate is the velocity of the heartbeat gauges by the number of contractions of the pump per minute. If there are irregularities in the heart rate, this may trigger a certain medical condition.

Granting to the American Heart Association, the normal adult human heart rate who is resting is around 60 to 100 beats per minute. A quick heart rate known as tachycardia is above 100bpm at rest. Meanwhile, the slow heart rate called Bradycardia is below 60 beats per minute at rest. In one instance your heart rate is above or below the normal heart rate then there is an irregular pattern in the beating, which may activate the disease.

How Apple Watch Heart Rate Sensor Works

With the Apple Watch Heart Rate App, it can notify your heart rate. But, remember if the rate is over and beyond the normal rate, pretty certain you will be in difficulty. This is then how this app runs.

When is the time Apple Watch gauge your heart rate?

Apple watch gauges your heart rate when you are walking, working out, breathing and even resting. It measures them throughout the entire day.

When you tap the Workout app, your Apple Watch gauges your heart rate during your workout and 3 minutes after your workout ends. Likewise, your Apple watch computes your walking average and daily resting heart rate by coordinating the accelerometer data and your background heart rate readings.

The heart rate sensor of the Apple watch must also be worn properly onto your wrist to make it run all the time. If it is not worn fittingly, it cannot detect accurately your heart rate. Equally well, if the weather is cold, the heart rate sensor will experience a hard time providing a reading. In this instance, you may use the waterproof case band that can protect your Apple Watch including its heart rate sensor and other features.

Looking into your Heart Rate

If you want to look at your heart rate, simply use and open the Heart Rate app of your Apple Watch. Once opened, wait for a while for your Apple watch to notify you of your heart rate.

Equally well, you can turn on the heart rate notifications to determine if your heart rate is above or below the normal beats per minute (BPM) and know if there is an irregular heartbeat.

The heart rate notifications are available solely on Apple Watch Series 1. Meanwhile, the irregular rhythm notifications can be viewed only with watch OS 5.1.2. or later. These notifications are considered exclusively in particular states and areas. To know which countries have irregular rhythm notifications you may click here.

You may follow these steps on how to view your heart rate notifications:

  1. Take your iPhone and open the Apple Watch app.
  2. Press to the My Watch tab and click Heart.
  3. Press the High Heart Rate and select a BPM.
  4. Press the Low Heart Rate and select a BPM.

A heartbeat that is more than 100bpm has a high heart rate and may experience fainting, shortness of breath, fatigue, dizziness, and cardiac arrest. Meanwhile, having a low heart rate that is below 60 bpm may experience feeling weak, dizziness, fatigue, shortness of breath, confusion, and difficulty exercising. In extreme cases, cardiac arrest, according to the American Heart Association (AHA).

To give you a glimpse of the Apple Watch Heart Sensor and how it runs you may watch this video below.

How Apple Watch gauges your heart rate

The Apple Watch is equipped with an optical heart sensor that utilizes the photoplethysmography. This tech works this way,” Blood is colored red because it reflects the red light and takes in green light. “

The Apple watch detects the quantity of blood falling along your wrist at any time utilizing the green LED lights with light-sensitive photodiodes. Once your heart beats, the blood flows on your wrist and the green light absorption becomes higher. The Apple watch can compute your heart rate by flashing its LED lights, hundreds of times per second.

The optical heat sensor also uses infrared light when Apple Watch gauges your heart rate in the background and for heart rate notifications as well. Meanwhile, the Apple Watch gauges your heart rate when you are working out using the green LED lights. This sounds the same when you are walking average, having breathed sessions, and calculating the Heart Rate variability (HRV).

The Bottom Line

Let your Apple watch sits snugly and comfortably on your wrist and the heart rate sensor will perform its task. It will give you the best heart rate readings that could protect you from any harmful medical condition. Let this ticker make you stay fit always.


Anne is the Content Manager for Bandget, providing the quality and stylish smartwatch band and fitness tracker straps in the marketplace today. It likewise proposes to impart helpful information and tips about watches and straps.

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