Heart Rate Monitor (HRM) very inaccurate when doing weights and pull ups
I work out 6 days a week and wear a Polar HRM with a chest strap. This is a pretty accurate device and is purpose built to read heart rates.
My last few workouts I wore both devices and while I was stretching, both devices were within 5 - 6 beats per min (BPM).
However when I was doing pull ups, my Polar HRM registered about 150-155 BPM (yes I was working hard) while the Band 2 was at 90 for the entirety of my exercise, after I finished my exercise and stood still, the Band 2 slowly crept up to about 125 as my Polar HRM showed my BPM going down from 150 to 125 (cooling down).
Why is the optical sensor not able to keep up with my heart rate when I am doing exercise ?
I work out 6 days a week and wear a Polar HRM with a chest strap. This is a pretty accurate device and is purpose built to read heart rates.
My last few workouts I wore both devices and while I was stretching, both devices were within 5 - 6 beats per min (BPM).
However when I was doing pull ups, my Polar HRM registered about 150-155 BPM (yes I was working hard) while the Band 2 was at 90 for the entirety of my exercise, after I finished my exercise and stood still, the Band 2 slowly crept up to about 125 as my Polar HRM showed my BPM going down from 150 to 125 (cooling down).
Why is the optical sensor not able to keep up with my heart rate when I am doing exercise ?