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Old 05-21-2007, 03:18 AM   #1
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Heart Rate and Burning Muscle Tissue?

I was reading a post on another thread and The Texan says:
Quote:
My personal opinion about that is it doesn't matter which one it is as long as you keep your heart rate in the 70-80% BPM range. Anything above that you risk burning muscle tissue.
I never knew that you could "burn muscle tissue"

How does this work?
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