I recently built a day time HRV measurement app. It runs in the background and is supposed to record HRV throughout the day. It works fine, but the issue it has is the BBI (Beat to Beat intervals) is a hit or miss. Either it works right away and its great, or it just doesn’t work at all for 20 minutes. I have tried resolving this but it seems to be a firmware/hardware/sensor issue. Is there anything that can be done to resolve this and make BBI readings more consistent? (I’m using forerunner 970)
