*** Any questions, problems and suggestions, please use the support thread ***</p><p>https://forums.garmin.com/showthread.php?334002-Datafields-Heart-Rate-Zone-graphs</p><p>.</p><p>This data field shows the heart rate zone distribution. The bar colors change dynamically during the activity depending on how much time is spent in each heart rate zone. The single field layout on all watches (except the Vivoactive) displays the time in min:sec alongside separate graphs for each zone. </p>