Is resting pulse rate of 54 to low?

The normal resting heart rate for an adult human is in the 65-75 range. a resting rate of 47 is not a low resting heart rate as long as you are very fit. The heart is a muscle and the more you exercise it the stronger it becomes. The stronger your heart is the more blood it pumps with each contraction, so it does not have to pump as rapidly. People who are very fit that have resting heart rates in the 40-50 range. Ryan Shay, a very successful elite marathoner died in the middle of the 2008 Olympic marathon trials due to a heart condition. If you become short of breath with walking up stairs or running a short distance especially if accompanied by chest, arm, or jaw pain and/or excessive perspiration, see a doctor immediately.