I am curious whether Fenix 5X has the same bug (feature?) as Fenix 3 HR has.
The calorie calculation of Fenix watches, both of the members of F3 and F5 families, uses the Firstbeat method as a general rule. But when you have a powermeter paired, F3HR calculates the calories burnt as being equal to the work done in kJ.
See some of my posts about it:
Just as a simple example why the 2nd gen Firstbeat method is better. Imagine you are climbing a hill with pretty high HR. Then you are at the top, some seconds later you still have high HR, but you are coasting down with a cadence of zero, so with a power of zero. Your calorie number does not change at all for minutes and minutes, even if your heart rate is being still at an elevated level.
I reported it to both Garmin support and F3 (HR) beta team, but no reaction at all. Some month later, which was 3 weeks ago I reported it to a user HermanB, who is a Firstbeat associate and present here for a while.
First he seemed to be a bit shocked and his first reaction was that I must have been wrong, he assumed that Firstbeat method had to be used always by newer Garmin watches including F3 family. He asked some time to discuss it first with his colleagues and later presumably with Garmin, but since this issue could have been checked within 3 weeks, I gave up. I dont believe I will get any clear confirmation and I dont think I will receive any help from Firstbeat guys to make Garmin fix it for F3 families.
So to cut a long story short: is there anybody het who has both a F5/5S/5X and a powermeter paired, and realized how his watch calculates calories when biking?
If not, can you please simply make a short test?
1. Bike or indoor bike app has to be started.
2. Powermeter has to be connected
3. Then please pedal backwards in order to generate zero power, but make your HR increase.
If your calories is not increasing then F5 family works the same way as F3 family.
Thanks for your help.