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.
Types of muscle fibers. Skeletal muscle, the type that is responsible for moving our muscles when we run, is comprised of three different muscle fiber types, each with its own advantages, disadvantages, and specialty.
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.