1) lack of physical activity
Frequent work out can make your heart perform nicely. Both being overweight and inactivity can raise heart rate. When you are large, your heart has to struggle a lot to source blood to all areas of the human body. Also, when much more blood is pumped, the heart beats more rapidly.
2) it can be tension
If your heart level is high, just one of the factors could be your tension amounts. Critical anxiety is poor simply because it always improves your heart level.