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When you start an activity with your Garmin Optical Heart Rate device, the optical heart rate

monitor provides feedback more frequently as the optical sensor is on all of the time and is trying

to measure heart rate on a continuous basis during a given activity period. The intent is to

provide the user with a more frequent and accurate heart rate reading during a given activity.

However, while Garmin's wrist heart rate monitor technology is state of the art, there are

inherent limitations with the technology that may cause some of the heart rate readings to be

inaccurate under certain circumstances. These circumstances include the user's physical

characteristics, the fit of the device, and the type and intensity of the activity as outlined above.

The heart rate monitor data is not intended to be used for medical purposes, nor is it intended to

diagnose, treat, cure or prevent any disease or condition.

What Can Cause the Heart Rate Sensor from

My Watch to Be Inaccurate?

Optical heart rate sensors* work by using lights that can measure small changes in blood volume

in the capillary layer just below the epidermis as blood flows through the wrist area. While

Garmin's wrist heart rate monitor technology is state of the art, there are inherent limitations

with the technology that may cause some of the heart rate readings to be inaccurate under certain

circumstances. The information below describes three main challenges we face when it comes to

wrist heart rate monitor technology:

False Heart Rate Detection

Changes in blood volume aren't always caused by changes in heart rate. Your vascular system is

like a balloon, so movement of your body or flexing of large muscle groups can affect the level

of blood volume in the wrist area and make it more challenging to accurately detect heart rate

among the presence of other signals that have a much larger magnitude and that change more

dynamically.

In the following example the watch initially detected and locked onto the runner's pulse,

but around 20 minutes in it locked to their running cadence: