While setting up my F5 I noticed two settings for "Max. HR" : once under Settings > User Profile > Heart Rate as expected but also under "Sport Heart Rate" - details in the manual http://www8.garmin.com/manuals/webhelp/fenix5x/EN-US/GUID-30C91919-943C-44E9-8048-901AC0881AEA.html
This sounds interesting as when you train a lot especially when preparing for a marathon it's very hard to hit your "Actual Max. HR" (say the one you'd get after doing a VO2Max test after being inactive for 6 months). However I found on my FR235 that I had to use my "Current Max.HR" (say all-out end of a 10k HR) HR to get a sensible VO2Max estimate. So does it mean that on the F5 I can set both these Max. HRs and get sensible VO2Max, TE, Training Load, etc... data ?
A search shows that similar settings are available on the 735 (F3's too ?) but I couldn't really find any detailed discussion about it. Thanks !