For the last 6 runs of varrying lengths (35 mins - 70 mins), my average HR has been 162 for EVERY run - 80% of my age-predicted max. HR.
The run usually starts out pretty slow and stays steady for the majority of the run at 170-175. I don't look at the HRM during the run other than "I wonder what it is now...oh, cool". I just go out and run. Am I doing something right or wrong or is it just a stange coincidence that all my runs are always 162 bpm?
SD
an average of 162 is kinda high for an easy run...depending on your maximum heart rate (i am assuming about 200) you should probably run your easy days in the range of 130-150...162 is getting pretty close to your threshold pace...i know this is not exactly what you were asking, but just giving my opinion
Age predicted max HR is useless. You need to determine your TRUE max HR in some sort of stress test. Hill repeats are good for this. Basically some type of hard, sustained effort finishing up with at least 400 meters all out running.
Once you know your true max and your resting HR, then you can make a meaningful comparison.
Also, don't use a straight percentage of max HR to determine the proper rate. Instead, use the Karvonen method of Heart Rate Reserve
Percent effort = (observed HR - HRrest) / (HRmax - HRrest) * 100
In your case, suppose your max was 200 and your resting HR was 40
Percent effort = (162 - 40) / (200 - 40) * 100 = 76%
Search the net for "Karvonen method" and "heart rate" for more on this. Also I'm sure someone here can post a link to a related article.
The answer to all your questions:
http://www.letsrun.com/forum/flat_read.php?board=1&thread=42240&page=0