Your heart rate, how to find it, and what it means

Updated 5 months ago by Peter Li

How to check your heart rate

You can check your heart rate any time using Atlas Multi-Trainer. Navigate to the feature by selecting UP/DOWN on the watch, then press GO and wait for the watch to measure your heart rate. You can also view your resting, active, and workout rates throughout the day.

When Atlas Multi-Trainer measures your heart rate

When you start a workout, Atlas Multi-Trainer measures your heart rate continuously during the session. This data, as well as other metrics it collects, helps Atlas Multi-Trainer estimate how many calories you’ve burned, monitor stress levels, and the impact on your recovery.

In addition, Atlas Multi-Trainer measures your heart rate periodically throughout the day when you’re still and when you’re walking. You can control the heart rate sensing interval in the Atlas smartphone app. You can increase the number of data points sensed per day by decreasing the interval.

  1. On your smartphone, open the Atlas smartphone app, tap Insights, and tap Profile in the upper right.
  2. Under the Watch category, select and modify Heart Rate Interval

Atlas Multi-Trainer checks to see if it's on your wrist during the heart rate measurement. Heart rate measurements are not logged when you are not wearing the watch.

How Atlas Multi-Trainer measures your heart rate

The Atlas Multi-Trainer was designed with an optical heart rate sensor in the watch. The core technology is very similar to the finger clip gadget with the red light that you may have seen at the doctor's office. This is called a "pulse oximeter" and just recently over the last 2-3 years, it has become available on the wrist. The wrist is notorious for being one of the most challenging places to extract pulse rate due to the poor signal quality and high amounts of noise.

The capillaries in your wrist expand and contract based on the volume of blood in your vessels at any given time - the rate at which they expand and contract is equivalent to your heart rate in beats per minute (BPM). The sensor works by emitting light into the capillaries in your wrist and measuring the amount of light reflected back. The light reflected back is proportional to the amount of blood in your capillaries. Our software then detects the peaks and valleys of the volume of blood in your capillaries, to determine your heart rate.

The Atlas Multi-Trainer optical heart rate technology is designed specifically for high motion environments. Atlas Multi-Trainer uses inertial motion sensors in combination with the heart rate sensor to cancel out excessive motion for a more accurate reading. This is a form of Biometric Signal Extraction called Motion Artifact Removal. This is where most heart rate monitoring technologies fail. When you start sprinting or doing pushups, most devices will lose the heart rate signal due to the crazy amount of motion artifact noise. Additional challenges arise when certain motions have significant forearm muscle activation. We've solved many of the issues with motion to provide one of the most accurate wrist-based heart rate sensors on the market and we have every intention to keep making it better. Additionally, to compensate for a wide range of human body types and demographics, we use both green and amber LEDs to maximize accuracy across different skin tones. Learn how to get the best heart rate accuracy.


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