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@ewanmac
On monday I tried to do a homespun 10mTT with a view to calculating my LTHR (e.g.) but the HRM seemed to be giving really inconsistent results for what was supposed to be a consistent level of effort.
Below is a scatter plot showing speed on the x axis and HR on the Y axis for that TT:
Looking at the screen of my garmin the HR seems to have been slightly more consistent on the turbo in the past two days but when I download the data there still seems to be a large variation in reported HR at a consistent effort.
5th Feb Turbo
6th Feb Turbo
220-age gives me a ballpark maximum HR of 190 and I'm 99% sure I never actually hit 220bpm.
Is the above variation within the bounds of what would be considered normal error or do I need a new HRM?