I will be interested to see your results. I stopped using my HR monitor years ago, as it just told me what I already knew; like Catrin and Veronica, my HR goes really high when I am working hard, but it always has. At my age, I think my "working" zone is supposed to be some ridiculously low number around 140 or even 135. I know that is not accurate for me. I also have a low resting HR when I wake up. Not 45 (although when I practice yoga it does go down to that), but around 55. I know that if it's above 60 before I get out of bed, I am getting sick or over training, or not had enough sleep. I got tired people of telling me my HR was too high, so now I just use RPE. I rarely have had that "gonna puke" feeling when riding; once on the 10 mile climb in Spain (Cat 2 climb in the Vuelta) and once on Monterrey Rd. out in the Berkshires. And like Oak, my peak flow, even when healthy is ridiculously low.