motor unit


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Related to motor unit: Motor unit recruitment

motor unit

[′mōd·ər ‚yü·nət]
(anatomy)
The axon of an anterior horn cell, or the motor fiber of a cranial nerve, together with the striated muscle fibers innervated by its terminal branches.
References in periodicals archive ?
sup][2],[16] Each motor unit may have one or more groups of summated muscle fibers.
It is likely that this coherence reflects shared motor unit recruitment patterns between the two muscles, as well as simultaneous increases in motor unit firing rates.
Another factor that accounts for the irregular behaviour of sEMG Fmedian with power output is the fact that the conduction velocities of the two main motor unit types are not clearly distinct; rather they have continuous distributions which overlap to a large extent (Troni et al.
Motor unit synchronization development was based on exercises employing the weight of 95% of 1 RM, in 5 sets of 2 repetitions each, done at the maximum speed of lifting of the particular weight for the particular participant (17, 19).
The importance of plyometric training appear in linking strength and speed together as plyometric training is specialized exercises designed to develop nerve explosive power through enhancing motor units work to produce maximum power in lowest possible time (Partic, 2000)
The EMG shows graphically the action potential generated in the recruited motor units of the muscle investigated.
The SEMG frequency or power spectrum density (SEMG-PSD) is typically measured as either the median (SEMG-MNF) or mean frequency (SEMG-MN), and is associated with the conduction velocity of the respective motor units (Kupa et al.
It is currently unclear what factors, other than motor unit recruitment, pulse duration may be influencing in regards to torque production.
Furthermore, increase in the amount of contraction forces leads to increase in the number of motor units [12].
Although it is well known that the surface EMG signal, as measured in the present study, provides limited evidence of specific motor unit recruitment or rate-coding changes, the observed median frequency statistic can be considered to be, in part, a reflection of muscle fiber-type activation [16].
The shape, size and frequency of the resulting motor unit potentials are judged.

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