I have been measuring my bloodpressure over the last few weeks twice a 
day. This machine also gives my heartrate. My heart rate (at rest) is 
68.5+-5.5 (62--87), so 75 is within my range, though not often. (and yes 
I don't know why it was twice above 80, I don't remember feeling different).

Heart rate is also a function of size*. The longer you are the lower 
your heart rate. That is why women have on average higher heart rates 
than men. I don't know why the AHA does not include that in their 
tables. If you are 1.5 -- 1.6 m tall, 75 if quite normal. If, on the 
other hand, you are 2m it is faster than you would expect.



*) one site gives BPM for mammals in general as 241 / fourth root of 
Body weight (kg) I assume this is for healthy animals (yet I should have 
a heart rate of more than 80 in this model). Assuming that the BMI model 
is correct it sort of implies that heart rate goes with the sqrt of your 
length. I think I have a paper somewhere that directly gives these 
scaling exponents for various measures, though I have no clue where to 
look, it is from before the internet :(

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