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).
You canât see the process happening, but when you forgo the gym for your bed, the âslow and fast-twitch endurance muscle fibersâ (necessary for strenuous and efficient exercise) become more âeasily fatigued muscle fiber types.â. As intense as this sounds, donât freak out!