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How do muscles grow and why do they hurt after working out?

How do muscles grow and why do they hurt after working out?
Please explain from anatomical view and explain it in understandable language to anyone without anatomical education.

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This entry was posted on Wednesday, June 24th, 2009 at 9:07 pm and is filed under Build Muscle and Burn Fat. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

3 Responses to “How do muscles grow and why do they hurt after working out?”

  1. I don't remember exactly why muscles grow bigger after working out, but I believe it has something to do with little rips in the muscle and how the muscle heals.

    Muscles hurt after working out because of the build up of a chemical called lactic acid. This chemical builds up in your muscles when the muscles aren't getting enough oxygen. Your muscles might be strong enough to do the work out, but if your respiratory and circulatory system are not in good enough shape to deliver oxygen to your working muscles, the muscles get what they need another way that results in the build up of lactic acid.

    You need "aerobic" fitness: You need to use your lungs more to expand their capacity (so you can take in more air/oxygen with each breath), and you need your heart to be strong enough to move more blood (which carries the oxygen) through your body so that your muscles get enough oxygen when you work out.

  2. There is a type of cell in muscles called 'Myoblast' there are thousands and thousands of them, in your muscles. They all group together to for "Myotube" which is strechy. The reason why they hurt I am not certain but I think that if you work on them for a very long time they tire out. (just s prediction)
  3. Muscles grow by the tearing and repair of muscle fibres. When muscle fibres repair they slightly grow more faster and bigger over time. Your muscles hurt after working out because of the lactid acid being sent to your muscles and because of your muscle fibres being torn.