I know there have been a number of questions about the Forerunner 235 heart rate accuracy, but my sense is that these are mostly about absolute precision. So, apologies if I have missed this somewhere here (I plead the defence of being new to the forums) but I have a question about the entire reliability of the HRM in my Forerunner. It seems to give very different readings for rather similar runs.
For example, for a 10k run, it gives me an average of 158bpm but with this profile;
I cannot understand why my heart rate would suddenly jump up. On another (14k) run, the average heart rate is 174bpm, with a jump from a sustained 130bpm or so in the first eight minutes to 180bpm, with no change in pace. A 20k run had an average of 177bpm with no meaningful variation. A similar distance run had an average of 180bpm. These figures seem high, but more understandable. Finally, a 10k run recorded an average of 109bpm, which seems remarkably low compared with other runs, eg the 154bpm from the prior 10k (which also exhibited a sudden jump mid-run).
Can anyone give me some guidance on whether these sorts of jumps and ranges are natural, and I should stop fretting, or they are unusual and suggest false readings or my ineptitude? Thanks very much for any help and advice.
Martin
