By: Arthur Anderson You may have caught a coach talking about different muscle types in class, or maybe it was in a health and fitness article you read. Essentially, we have been told that there are three different types of muscle fiber; Type I (slow twitch), Type IIa (fast twitch) and Type IIb (superfast twitch). Okay so what does the this mean. A Type I, slow twitch, muscle fiber is more efficient at using oxygen to generate ATP and can go a long time before fatigue sets in; they are designed for endurance. A Type II, fast twitch and superfast twitch, muscle fiber is more efficient at anaerobic metabolism and provide for powerful bursts of energy. It has been believed for some time that you were born with fixed distribution of these fibers in your muscles. So, if you were born with a higher portion of slow twitch muscle fibers...
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