Normal levels of creatinine in the blood are approximately 0.6 to 1.2 milligrams (mg) per deciliter (dL) in adult males and 0.5 to 1.1 milligrams per deciliter in adult females. Muscular young or middle-aged adults may have more creatinine in their blood than the norm for the general population.
Fiber Types and Skeletal Muscle Hypertrophy The force generated by a muscle is dependent on its size and the muscle fiber type composition. Skeletal muscle fibers are classified into two major categories; slow-twitch (Type 1) and fast-twitch fibers (Type II).
Muscle fiber types can be broken down into two main types: slow twitch muscle fibers and fast twitch muscle fibers. Type II fibers can subsequently be broken down into two types: type IIA, which is referred to as fast twitch oxidative glycolytic, and type IIX, which is referred to as fast twitch glycolytic.