A student decided to investigate the relation of height to resting heart rate. The student determined the resting heart rate of 10 persons ranging in height from 55 to 75 inches. Resting heart rate was determined after each subject had been lying down resting for 20 minutes. In this experiment, height is the

Air temperature: When temperatures (and the humidity) soar, the heart pumps a little more blood, so your pulse rate may increase, but usually no more than five to 10 beats a minute. Body position: Resting, sitting or standing, your pulse is usually the same. Sometimes as you stand for the first 15 to 20 seconds, your pulse may go up a little bit, but after a couple of minutes it should settle down. Emotions: If you’re stressed, anxious or "extraordinarily happy or sad" your emotions can raise your pulse. Body size: Body size usually doesn’t change pulse. If you’re very obese, you might see a higher resting pulse than normal, but usually not more than 100. Medication use: Meds that block your adrenaline (beta blockers) tend to slow your pulse, while too much thyroid medication or too high of a dosage will raise it.