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).
Muscle fibre composition will affect the relationship i.e. when the faster twitch muscle fibres (for want of a general term) start activating later in the contraction, there may be an exponential rise in force for activation. Processing of the EMG signal will massively affect this relationship as well. These are only a select few reasons why on the global side (i.e. in vivo) of the muscular force-activation relationship, we report a curvilinear relationship between activation (surface EMG) and muscle force.