I am 41 and do a lot of cycling. I have not been physical fit all my life but I have really gotten into biking over the last year, I get out most days and somedays I have been out for 7 hours. This is mountain biking and its all VERY hilly due to the area I live in so its is always demanding.
I cycling with people the same age some older and although we are the same pace etc there HR goes higher than mine? they can hit 180, I never go above 160. I tend to be around 155 for most of the ride.
What does this mean? does my HR not peak as high as I have not been fit all my life.
edit - My resting HR is low, sometimes just under 50 but norms 50 to 60.