why does your heart beat faster during exercise
WHY? is our attempt to answer. Do you have a question? Send it toP. You probably know that exerciserunning, jumping, swimming, dancingwill make your heart beat faster. But did you know that your heart rate also speeds up when you feel scared, nervous, angry, or excited? Your movements and your feelings can give your heart a little workout. Its your bodys way of making sure you are prepared for anything. P
Your heart is a muscle that pumps blood to the lungs to get oxygen, and then to the rest of the body. Thats really important, because the cells in your body need oxygen to survive!
When you exercise, your muscles need even more oxygen because they are working harder. The faster your heart beats, the faster it can get more blood and oxygen to your muscles. And when you feel scared, angry, or excited, your brain also tells your heart to be faster. P When your brain senses dangerlike a bully at school, a fire, or an angry dogit has to decide whether to stay and fight the danger, or run away from it. This reaction is called fight or flight. Fear causes the brain to release a chemical called adrenaline (uh-DREN-uh-lin), which speeds up your breathing and heart rate.
The extra oxygen gives you the strength and brain power to fight backor run away as fast as you can. This can happen even when youre not in a life-threatening situation, but just feeling nervous or excited: watching a scary movie, performing on stage, having an argument with a friend, or riding a roller coaster. Play this quick game to see how activities change how fast the heart beats. Exercise increases the rate at which energy is needed from food. This increases the need for both food and oxygen in the body. This is why your pulse rate and breathing rate increase with exercise.
Your pulse is just an indication of your heart rate as your arteries expand each timethe ventricles pump blood out of the heart. Your heart speeds up to pump extra food and oxygen to the muscles. Breathing speeds up to get more oxygen and to get rid of more carbon dioxide. When a fit person, such as an athlete, exercises the pulse rate, breathing rate and lactic acid levels rise much less than they do in an unfit person. The time which it takes for pulse and breathing rate to return to normal is called the recovery time, and the fitter you are, the shorter your recovery time.
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