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).
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.