Motor Unit Recruitment
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	Motor Unit Recruitment is very dependent on FORCE production needs of the muscle and proceeds from the ‘smallest‘ motor units (Type I) to ‘largest’ motor units (Type IIa and then to Type IIb/x).Can You Explain Motor Unit Recruitment? Read more below from a former student and see if you can describe as well.
	Motor unit recruitment depends on the force/resistance of the exercise. With light intensity exercise the Type I (slow twitch) motor units are recruited. When the load is increased, the Type IIa (fast twitch) will be recruited with the help of the Type I fibers. When the load becomes even greater, the Type IIb/x will be recruited with the help of the Type IIa and Type I motor units. Therefore Type I motor units are always firing no matter what the intensity. Jennifer Hill, Exercise Physiology Student, Spring 2010 The Motor Unit: What two different anatomical constituents compose a motor unit?
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