A Wonderleaf question
Why does my heart beat faster when I run?
a real page from the book
Your heart beats faster when you run because your muscles need more oxygen to keep working. Blood carries that oxygen, so your heart pumps more quickly and strongly to send extra blood to your legs, arms, and lungs while your body is moving hard.
Your breathing joins in, pulling more oxygen into the blood with each deeper breath. After you stop, your heart may stay quick for a little while because your muscles are still recovering and your body is checking that everything has enough oxygen again.
Wonder words
- oxygen
- muscles
- pulse
- circulation
Try it out
Count your pulse while sitting, then after ten jumping jacks, and compare the two numbers.
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