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IN WHAT ORDER DO WE RECRUIT OUR MUSCLE FIBERS? (Henneman's size principle) ⁣

Anyway, the central nervous system (CNS) is responsible for the orderly recruitment of motor neurons, beginning with the smallest motor units.[1] Henneman's size principle indicates that motor units are recruited from smallest to largest based on the size of the load. For smaller loads requiring less force, slow twitch, low-force, fatigue-resistant muscle fibers are activated prior to the recruitment of the fast twitch, high-force, less fatigue-resistant muscle fibers. Larger motor units are typically composed of faster muscle fibers that generate higher forces.[2] ⁣⁣⁣
Secondly, the number of muscle fibers controlled by a motor unit increases exponentially with recruitment order. While there are hundreds of thousands of fibers inside a muscle, the number of fibers controlled by each motor unit varies widely, from a handful (low-threshold ones) up to a couple of thousand (high-threshold ones). Therefore, the amount of force that a low-threshold motor unit can produce is far smaller than the amount of force exerted by a high-threshold motor unit.⁣⁣⁣
What happens when we move light weights to failure? ⁣⁣⁣
Just like mentioned above, light loads will recruit low-threshold muscle fiber that exert less force. However, since we're taking the contraction to muscular failure, things are a little different:⁣⁣⁣
Quite in fact, to compensate for the reduced amount of force produced by each (fatigued) muscle fiber governed by low-threshold motor units, the central nervous system will recruit high-threshold motor units.⁣⁣⁣