Garmin watch is not useful for vo2 max intervals. It is way off for heart rates above 160 or so. This is my observation and many others report the same.
I only just a Garmin Dual strap now. I used to dual record with an Apple Watch to enable simultaneous use various different apps. Although I never drilled down into a minute by minute comparison, my understanding is that the sampling rates were different. Are a few beats difference a significant factor when measuring performance?
How is it off? I use a heart strap monitor which I think is pretty accurate? Can you give an example please as this is important to know when doing VO2 max training. Thank you.
I beleive He’s referring to the Garmin Watch’s Built In Optical HR sensor. My experience in using it is also similar, it is dreadful when there is a lot of arm swinging.
I only use a Chest HR (PolarH10) tho I am toying with the idea of a bicep/arm based optical HR as I tend to get chaffing using the chest strap.