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.
I will explain exactly what these are in a moment. The percentages of these different fiber types that your muscles are made of can help you determine exactly how you should train each particular muscle group in your body. The Different Muscle Fibers. Slow Twitch: These are also known as Type 1 or red muscle fibers.