I've been getting HR results like the one attached on a semi-regular base for the past couple of weeks with my Garmin Soft Strap Premium Heart Rate Monitor. I wet the strap before putting it on, keep the strap tight, wear a tight base layer under my jersey, and ride hard enough that I'm sweating consistently after the first 10-15 minutes of the ride. I also put in a new battery a week ago. The chart below is from a steady state tempo ride with speed, power, cadence, weather conditions, etc all remaining consistent throughout the activity. HR should have been in a relatively straight line throughout the hour ride.
I've had this HRM for 2 or 3 seasons, and have gotten very consistent results from it. Any idea what might be going on?
Other potentially relevant information - the HRM is paired to a Garmin 520, which is paired with an iPhone 8. I am also running a VIRB Ultra 30 paired to the HRM. ciq.forums.garmin.com/.../1339372.jpg
