I am going to wear the HRM when riding up a few steep local hills to see how fast my heart beats then. I used to get it to the high 190s but I guess that would be more like 160-70 bpm now.
I did a little (outdoor) test ride this afternoon...
I was surprised to find out that the highest heart rate I hit (160 bpm) was riding briskly up the gentle drag of the Burnley Rd into a headwind. I had done a singlespeed ramp at 8-10% gradient before that and only hit 158 bpm.
I would never have guessed that the cardiac efforts would be so similar because the climb felt so hard, but that is probably because I was riding up it over-geared. I will do it in a comfortable gear at the same speed next time to see what difference that makes.
I was making pretty hard efforts so I would say that my maximum possible probably IS around 170 bpm but I will treat it as being 165 bpm to be on the safer/more comfortable side!
Hmm... I was just looking up heart rate zones and found huge variations of the definitions. Compare these 2 lots:
Z1: 50-60% vs 68-73%
Z2: 60-70% vs 73-80%
Z3: 70-80% vs 80-87%
Z4: 80-90% vs 87-93%
Z5: 90-100% vs 93-100%
I think the ranges for zones 1 and 5 don't matter too much because
very, very easy and
aaaaargh!!! are simple to understand, but the other zones differ wildly.
I suspect that the second group of zone definitions is more useful? I reckon that the first group is simplified to be easy to remember!