Originally Posted by
Shadowjaxs
I had my HRM for a few months now. My max Hr went from 170 to 171 now it's 173 in the last few months. Is this normal? Your max heart rate changing
Yes. It's so normal that Garmin computers have an "auto-detect" option for MaxHR.
Originally Posted by
unabowler
How do you know it's really your max? That is to say, are you sure you really hit your true max on the earlier rides, or on the last one for that matter.
What do you really mean by max? Is it the highest heart rate you can achieve at your current fitness level? The most your body will ever be able to achieve? What you're up to today, after staying up too late and making up for it with lots of coffee? It's a
slightly fuzzy concept, which leads to slightly different answers if you measure on different days. Keep in mind 170 vs 173 is within 2 %, the margin of error is bigger than that for optical HRMs.