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.
White fibers tend to have little to no myoglobin. Muscle fibers in general are categorized into three types, based on type of myoglobin (fast or slow) and the method it uses to produce ATP (glycolysis or oxidative phosphorylation): Type I. Slow twitch.Slower to contract, but also slower to fatigue.hite fibers tend to have little to no myoglobin. Muscle fibers in general are categorized into three types, based on type of myoglobin (fast or slow) and the method it uses to produce ATP (glycolysis or oxidative phosphorylation): Type I. Slow twitch. Slower to contract, but also slower to fatigue.