So I have a problem with my heart rate lately: I can't get it up anymore when I bike!
When I first started cycling 3 months ago I had no problem whatsoever getting my HR up to 165. If I really pushed I could get it up to 175.
Fast forward a few months, and I'm now biking more than I've ever done in my life, but I've noticed a downward trend in my heart rate, so much so that I'm now worried that biking is no longer providing me with a good workout anymore.
I biked to work yesterday morning, and my HR was 137av/150max. I couldn't get it past 150, when back in May it simply took a minute or so of biking and I'd already shoot up to 165. On the trip back, I was fighting a giant head wind and traveling uphill, pedaling with everything I could in my muscles... and I got 135av/149max. What on earth?
So I looked back at my records and took a peek at the last time I did my hill training course: 142av/154max. Argh! I try do these routes as hard as I can, until my muscles can't take it anymore. What is going on?!
Compare this to the 160av/175max I got in early June, or the 158av/168max in May and a host of similar readings.
Am I just biking too much and not letting my muscles recover enough? I usually only have one day of rest per week now, should I increase that?