RHR is an very important number, you see this number increasing you are probably overtraining, or getting sick. Also your training zones depend on that number.
To bad, when you own a device that pretends to measure RHR but never does really. That's the case with the FR235 since the battery improvement firmware update!
I usually have RHR around 45, before the update I got very reliable numbers between 44 and 47, each day. Right after the update I got a jump to around 55, and it stayed there with numbers between 48 and 59!
I can get you an 50 just by sitting there, so that seems clearly wrong. To prove that, I switched the FR 235 to broadcasting mode and left it on during the night. RHR next morning: 43! Back to the normal mode, after next night, 53! Just to be clear:
1. night - normal mode: RHR 55
2. night - broadcasting mode: RHR 43
3. night - normal mode: RHR 53
I invite everyone to do the same and let Garmin know the details. They can't measure it correctly anymore because the algorithm stop measuring when there is no movement, sucessfully screwing up the RHR scenario. RHR is measured when the body is completely resting!
Wrong RHR gives you wrong, not reliable signals on your training recovery as well as training intensity, that can be harmful when you overlook overtraining or sickness or train in the wrong zone.
Same is for the Vivosmart HR, DCRainmaker experienced the same issue (when he tested the FR235, it was with the old firmware, which gave ok numbers) http://www.dcrainmaker.com/2016/01/garmin-vivosmarthr-review.html
