Thus with any load of work you notice how the Type I fibers are always firing. This recruits the most powerful motor units in the body, the Type IIx and you see the Type IIa and Type I are helping. In the bottom picture, there are many plates on the bar requiring near maximal exertion of the exercise. The Type IIa is doing most of the work with the help of the Type I. In the middle picture there are more plates on the bar and thus more force to overcome. With the top picture, the load is light for the exerciser and the Type I motor units have been innervated. Learning Tip: Notice in the above graphic how the author is depicting the motor unit with ONE nerve innervating multiple muscle fibers on the left side of the graphic. Jennifer Hill, Exercise Physiology Student. Therefore Type I motor units are always firing no matter what the intensity. When the load becomes even greater, the Type IIx will be recruited with the help of the Type IIa and Type I motor units. When the load is increased, the Type IIa (fast twitch) will be recruited with the help of the Type I fibers. With light intensity exercise the Type I (slow twitch) motor units are recruited. Motor unit recruitment depends on the force/resistance of the exercise. This is the all-or-none response of motor units. ![]() When the neuron ceases to fire, all of the muscle fibers innervated by the nerve will also cease to contract. the idea that the magnitude of the action capacity in a chosen neuron is separate from the size of the stimulant. When the neuron impulse fires, all of the muscle fibers innervated by the nerve will contract. ![]() What is the All-or-None Response of Motor Units? The Motor Unit: What two different anatomical constituents compose a motor unit? Motor Unit, All-or-None Response of Motor Units and Motor Unit Recruitment
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