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.
Let us now proceed to the three histochemical assays typically used to determine muscle fiber types. These three assays are the myosin ATPase (mATPase) assay, the succinate dehydrogenase (SDH) assay, and the a-glycerophosphate dehydrogenase (Î±GPD) assay. The histochemical assay for myofibrillar ATPase activity is used to distinguish between fast- and slow-contracting muscle fibers.