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.
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.