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.
Type 1 muscle fibers are the endurance fibers of muscle and are the predominant fiber activated in aerobic exercise. Exercise is medicine: exercise and metabolic syndrome. The numbers of myonuclei and satellite cells per muscle fiber were calculated.