In fact, you should find that, as your heart becomes more efficient from endurance exercise, your resting pulse rate is slower than it was before you took up this healthy habit. To take your pulse, press the tips of your index and middle fingers against the inside of the opposite wrist, just below the mound oat the base of your thumb, and count how many pulsations you feel in a 10-second period. Multiplying this number by 6 will give you your heart rate. During the minute that you have stopped exercising to take your pulse, your heart will have slowed down, and you won't get an accurate reading. All of these situations can give you inaccurate readings.
Some eye drops used to treat glaucoma also contain beta blockers.
Your heart rate is a reflection of how hard your body is working. Beta blockers tend to keep your heart rate slower, so no matter how hard you push yourself, you might never reach the heart rate you are trying for. You might end up exerting yourself too much, as you try in vain to reach a heart rate that your beta blockers won't allow. However, getting access to a treadmill test is not practical for some people, and it isn't necessary for most older adults who are in basically good health. It's something to consider if you're over 65 or if you have access to a treadmill test through a health professional.