I'm trying to understand some of the things I've observed about my blood pressure and heart rate since I've started cycling regularly. I've been at this about three months now and so far all the right things seem to be happening -- my stamina has steadily increased to where 50 miles on a ride is no problem and for the most part I feel great when I finish any ride. The first month or so I was monitoring my blood pressure and noticed that as the weeks went by it was steadily declining to normal levels from the borderline-high levels I was seeing before I started riding regularly, so after a while I stopped checking it as often. I've checked it the last couple of days and noticed that the BP seems elevated again -- somewhere around 140/90. The good thing is that before all this started my resting heart rate was in the high 90's to low 100's (I was in terrible shape) and now it is in the low 70's consistently, so obviously my CV system is in better shape. I just can't figure out why the BP is elevated again with no factors to explain the rise after it had been declining for a while.