I have a Vivomove Type 3 wristwatch. During activity monitoring, the measured heart rate is ~ 150-160. After the activity I sync with my phone the activity is displayed. However, the maximum heart rate value in the Garmin connect was only 114 during activity. I used other activity function. The activity was one hour and for the last 20-25 minutes I was watching my heart rate above 160 throughout my watch. In the application I looked back at the graph there was a maximum of 114 and drew a randomly drawn graph for me. But I think the clock measured it properly during training.