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).
The three main types are skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle has a striped appearance earning its other name striated muscle. It is designed to work at a moments notice but it tires easily. Smooth muscle is not striped. It is designed to work slowly so therefore it tires slowly.