motor unit recruitment


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motor unit recruitment

the bringing into activity of additional motor neurons, which causes additional muscle fibers to contract. As more units are recruited and as the frequency of discharge increases, muscle tension increases. The pattern of motor unit recruitment varies, depending on the inherent properties of specific motor neurons.
References in periodicals archive ?
1993) reported that motor unit recruitment is reduced in people who do not regularly perform resistance training.
Instead, it is much more likely that patterns of motor unit recruitment and changes in motor unit firing rates that are shared between the two muscles is the probable mechanism for the EMG coherence demonstrated in the present study.
Motor unit recruitment for dynamic tasks: Current understanding and future directions.
Therefore, the results extracted from the sEMG amplitude about the motor unit recruitment of the MU may be underestimated since it is possible that there is an amplitude cancellation.
They assumed that motor unit recruitment overlap was the only mechanism contributing to the change in force.
Prior studies investigating force and isometric contractions found mostly a curvilinear increase in SEMG amplitude with increasing muscle force because of concurrent increases in motor unit recruitment and firing rate up to 80%-MVC, after which increases are due primarily to increases in firing rate (Coburn et al, 2005).
3] looking at individual contributions to motor unit recruitment found that increases in average conduction velocity was a major contributor to variantions in median frequency and suggested using the median frequency as the index to indentify different muscle's recruitment strategies.
called upon from a cadre of neural pathways to perform a task) according to what is known as the "size principle of motor unit recruitment.
There was moderate to markedly reduced motor unit recruitment pattern in distal musculature.
Electromyography tests motor unit recruitment and the integrity of the muscle innervation.
in addition, tempo running mimics the pattern of muscle motor unit recruitment during actual competition.
To investigate the relation between spectral sEMG indicators and time from the onset of the exercise until the power output corresponding to the ventilatory threshold (where full motor unit recruitment is theoretically reached), the time-courses of Fmedian are plotted up to T-vent for individual subjects [Figure 2(a)].