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.
For many people, if they are not responding well to this conventional rep range, this does not mean they are not able to build more muscle. It is a matter of taking a dynamic training approach to explore the range of muscle fiber stimulation. And the bodybuilders, who are responding at an above average rate to the conventional rep range, will also make better gains when they adopt the dynamic training approach.