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The Navy SEAL Physical Fitness Guide - Uniformed Services ...

The Navy SEAL Physical Fitness Guide - Uniformed Services ...

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Muscle Structure andFunction<strong>The</strong> three major types of muscle are:" Cardiac muscle" Skeletal muscle" Smooth muscleThis discussion will be limited to skeletal muscles which, by converting chemicalenergy to mechanical energy, produce movement. We will present a description of thesubtypes of skeletal muscles, including their characteristics and distribution. Althoughthere may be many new subtypes of skeletal muscle fibers, generally skeletal muscle canbe characterized into three basic types:" Slow Twitch Oxidative (Type I)" Fast Twitch Oxidative-Glycolytic (Type IIa)" Fast Twitch Glycolytic (Type IIb)<strong>The</strong> <strong>Navy</strong> <strong>SEAL</strong> <strong>Physical</strong> <strong>Fitness</strong> <strong>Guide</strong> 7

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