Does excercising produce human growth hormone?

I heard scientists did tests next to a group of guys, they took a sample of their blood measured their level of growth hormone, after had them go sprint, next took a sample of their blood and noticed resembling a 400% or 500% increase in growth hormone occured. But then go back to normal after an hour or an hour and 1/2. What im asking is it true your body make growth hormone when you excercise? It uses the growth hormone to make your muscles bigger and repair them correct?

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Answers:    Yes, your body does make Human Growth Hormone when you exercise. However, scientists are unsure of why. HGH does not, I believe, aid surrounded by muscle repair.
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