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The soleus muscle is composed of "red" muscle which was revealed to indicate that muscle fibers were fatigue-resistant but created small forces when contracting. The gastrocnemius muscle is heterogeneous, composed of both "red" and "pale" muscle, and thus containing fast-twitch high force fibers.
The higher the recruitment the stronger the muscle contraction will be. Motor units are generally recruited in order of smallest to largest (smallest motor neurons to largest motor neurons, and thus slow to fast twitch) as contraction increases. This is known as Henneman's size principle. [4]
Consecutive stimulation on the motor unit fibers from the alpha motor neuron causes the muscle to twitch more frequently until the twitches "fuse" temporally. This produces a greater force than singular contractions by decreasing the interval between stimulations to produce a larger force with the same number of motor units.
“The proportion of slow-twitch to fast-twitch muscle fibers in a particular muscle varies depending on the function of the muscle and the type of training in which an individual participates.
The size principle stipulates that when the motor neurons of a motor pool fire, leading to the contraction of a terminal muscle fiber, the motor units containing the smallest motor neurons fire first. As excitatory signalling increases, larger motor neurons are subsequently recruited and contraction strength increases. Further, this ...
A fasciculation, or muscle twitch, is a spontaneous, involuntary muscle contraction and relaxation, involving fine muscle fibers. [1] They are common, with as many as 70% of people experiencing them. [1] They can be benign, or associated with more serious conditions. [1]
Endurance training can increase the size of low force-producing slow twitch muscle by as much as resistance training can increase the size of high force-producing fast twitch muscle. These situations have the ability to result in two muscles of equal size, but the slow twitch muscle produces only a small fraction of the maximum contractile ...
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