Changes

" I DG (talk) suspect it may be accelerometry - activity based guessing in the bad ones. This is very bad because the difference between what accelerometry would predict and what is actually happening is very important information."  

" I DG (talk) suspect it may be accelerometry - activity based guessing in the bad ones. This is very bad because the difference between what accelerometry would predict and what is actually happening is very important information."  

Ie the difference between what the heart rate user is experiencing under exercise and what they should be is very important information and the device pawns off the first as the second. The difference should be pretty obvious if user does exercise that does not involve moving the relevant arm. Lot of devices do this and then defend their dishonesty with words. They should not be allowed and there should be a page all about it!

In other words the difference between what the heart rate user is experiencing under exercise and what they should be is very important information and the device pawns off the first as the second. The difference should be pretty obvious if user does exercise that does not involve moving the relevant arm. Lot of devices do this with other sensors and then defend their dishonesty with words. They should not be allowed and there should be a page all about it!