The Frontier X Heart Rhythm feature helps detect any heart rhythm deviations from Normal Sinus Rhythm (the typical rhythm of the heart). Beyond identifying the presence of other rhythms, it also helps you understand the duration, frequency and occasions when these rhythm changes occurred. Please note that Heart Rhythm does not capture all aspects of cardiac function. Furthermore, the Heart Rhythm markings are not sufficient to make any clinical assessment and are not intended to be used for diagnostic or treatment purposes.

It’s important to clarify that everyone can have occasional abnormal heartbeats, and they’re often harmless. The percentage of other rhythms that may be considered “normal” can vary based on several factors, including the context in which they occur and individual health conditions.

For a healthy individual, small deviations in rhythms might result in a session being flagged as other. This can be especially seen to increase with caffeine intake, stress, or even at rest without any specific trigger.
In scientific literature there is a wide range of % abnormal beats that is considered acceptable.

I seem to get between 20 and 40% “other rhythm” every time I run. I’m also wondered if this is normal.