Factoids on heart rate :
There are three numbers :
Base rate : rate when you have awaken from sleep in the morning.
Maximum rate : 220 minus your age.
Working rate : The difference between base rate and maximum rate.
As you wake up in the morning and start work your heart rate will rise above base rate and jump within base rate and maximum rate.
Generally the lower a base rate one has the better. Unless he is weak and can't walk, and thus the lower rate is due to a disease.
Pulse rate while walking is a good indicator of one's heart condition. Doctors perform treadmill test, also called a stress test, to measure heat condition.
In treadmill test one has to walk on it for 27 minutes. The test taker will increase the speed and inclination of the treadmill every 3 minutes. It starts with 3 km/hr. And is gradually increased up to 8 km/hr. If one can complete the full test, his heart is healthy. Not 100% sure it's healthy, but 90% sure, more accurate than any other test.
If your pulse jumps above 85% of maximum rate doctor will stop the test and you fail. There are other conditions, but this one was for an idea.