Grit X

Het kan wel enorm verschillen, althans wel bij mij. Ik heb door de jaren heen een aantal inspanningstesten gedaan bij de sportarts in het ziekenhuis. Dat is uiteraard met professionele apparatuur. Ter vergelijking heb ik dit naast een aantal horloges en hartslagbanden gehouden. Puur uit interesse. D

Polar Grit X Pro: 4 years, daily use. The sensor started to get unreliable, the screen got dimmer, some buttons started to stick... It was just time to retire the watch.

I thought true HRV is the time between heartbeats, averaged? R-R interval? Can't an ECG chest measure this quite accurately? If there are continuous heart measurements throughout sleep and then averaged, I think this is a very reasonable basis to test a wearable accuracy. It's the whole basis for th

It is sad. As I read here, several outdoor runs are needed with a Polar watch to calibrate it using GNSS signals. Manual: > Your watch measures speed and distance from your wrist movements with a built-in accelerometer. This feature comes in handy when running indoors or in places with limited GPS s

I thought I was the only one. I used my laptop polar flow app which seems to catch the miles and when I did a factory reset it logged in the miles but back to the same predicament and also filed a support ticket. (Polar Grit X Pro)