During exercise, the muscles pull oxygen out of the bloodssstream, blood vessels dilate for increased blood flow, the heart and diaphragm work harder, and the body starts to sweat to remove heat from the body. On the molecular level, the body creates adenosine triphosphate (ATP) to provide energy to the exercising muscles.Know More
During exercise, cells inside the muscles split the muscles' ample supply of glycogen into glucose, which then is split again to form ATP and lactic acid; this process requires about 12 different chemical reactions. ATP provides energy to the muscles' cells. The lactic acid, which is a by-product of these chemical reactions, causes muscles to ache and must be removed via the bloodstream.
Because muscles pull oxygen out of the bloodstream during exercise, the body must respond by increasing the blood flow from the heart and diverting blood flow from other organs to the working muscles. For instance, the digestive system typically slows down during strenuous exercise. As a working muscle uses up its store of ATP, it releases chemical by-products that cause blood vessels to dilate, thus increasing oxygen flow throughout the body. Blood vessels to the skin also dilate, allowing heat to dissipate. In addition, sweat glands activate during exercise to produce sweat. As the sweat evaporates upon contact with the air, it also helps to lower the body's temperature through the dissipation of built-up heat.Learn more about Exercise
According to WebMD, exercise benefits teenagers by toning the body, strengthening muscles and bones, encouraging a healthy weight and promoting healthy skin. It also improves sleep and mood through triggering endorphins, according to TeensHealth.Full Answer >
As soon as a person begins to exercise, the heart begins beating more rapidly in an effort to pump oxygen-containing blood to the muscles. In order to contract, which they must during exercise, muscles require more oxygen than they do when at rest. A person's heart rate continues to increase with more exertion until it reaches its maximum capacity.Full Answer >
Exercising with a leaky heart valve should begin with light activities, such as walking or swimming. Any high-exertion activities or contact sports should be cleared by a doctor before participating as they can further damage the heart.Full Answer >
While the normal resting heart rate is 60 to 80 beats per minute, according to the American Heart Association, heart rate during exercise is measured in relationship to the target heart rate, rather than to any average. Target heart rate depends on the age of the exerciser.Full Answer >