First a little background on me. I'm a fairly big guy at 5'10 and 210lbs. I'm an average cyclist just looking to improve. I ride road/mountain about 3-4 times a week for a total of about 4-5 hours (I've only been doing this for a few months). I'm 27 years old and come from a football/sprinting background. I'm tying to become more serious about cycling but endurance has never been my strong point.
I just took my Polar S725 HR monitor on my first ride and I was shocked to see my average HR was 180bpm over an hour long road ride. with it being over 180 for 45 minutes. I checked it by hand and again on the same ride last night, sure enough the meter was right on. I was pushing pretty hard but still only managed a 17 mph average (which is quite good for me as I'm usually closer to 15mph) over an 19 mile ride with just 650ft of climbing. This average does include stopping at traffic lights so It may be a little higher. My max HR was 205bpm witch I hit on an uphill I attacked pretty hard. I was over 200bpm for nearly 2 minutes.
Some questions. Is this bad? I felt fairly comfortable at 180 but started to break down above 185. What should I do to try and make more power at this HR?
I have the Polar files (HR, Speed, Altitude) if anybody would like to see them.
If I were you, I'd:
Clearly define your aims
Get yourself a HRM training book and another book on general cycling training. I'd recommend books by Sally Edwards, Sally Reed, Ed Burke, Joe Friel.
If your aims are endurance, you'll struggle given your description of your background. Read about fast and slow twitch muscle groups. Also read up on building a base fitness. This involves increasing your milage and reducing your intensity. 180 avg HR with a Max HR of 205 given that you are new to cycling is too high an intensity to develop your base (core) fitness.
Also do some reading around the area of HR zones. You do however need to doing the boring stuff in building up a base before you can do more advanced training such as intervals and see effective results.