When a muscle starts to fatigue, as the person tries to maintain the same muscle force, what is seen on an emg of that muscle The motor neuron size principle states that, with increasing strength of input onto motor neurons, smaller motor neurons are recruited and fire action potentials before larger motor neurons are recruited. According to the henneman size principle, smaller motor units are recruited before larger ones
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What is muscle resting length?
The activation of one motor neuron will result in a weak but distributed muscle contraction
The activation of more motor neurons will result in more muscle fibers being activated, and therefore a stronger muscle contraction. The first motor units to be activated are smaller, with fewer connected muscle fibers, and the later recruited fibers will be larger and connected to more muscle fibers (explained later). When the muscle is activated initially, the first motor units to fire are small in size and weak in the degree of tension they can generate Starting with the smallest motor units,.
The smaller motor units in a muscle have motor neurons that are more excitable Initial activation of these smaller motor units results in a relatively small degree of tension generated in a muscle. When a motor neuron is activated, all of the muscle fibres stimulated by the neuron are contracted Motor units are generally recruited in order of size, from smallest to largest, as contraction increases
This is known as henneman's size principle.
