“Heart rates control a live picture of a person’s health condition, as they are considered a sensitive indicator of the functions of the heart and blood circulation. When the heart rate is measured, it shows the amount of blood that the heart pumps to the body during a specific period of time. The heart rate reflects the response of the cardiac system - "The blood vessels respond to internal and external stimuli, such as exercise, stress, or exposure to emotionally affecting situations. Therefore, understanding heart rate is an important part of monitoring personal health and knowing how the body responds to different stimuli."