Patterns of
motor unit recruitment can be determined using surface EMG.
It has been shown that frequency of stimulation increases force production by increasing the specific tension on each individual
motor unit [6-7], which may also increase the risk for contraction-induced muscle injury [12].
Resistance training affects
motor units of the body which leads to special adaptation [2].
Electromyogram power spectra frequencies associated with
motor unit recruitment strategies // Journal of Applied Physiology.--United States, 1990.
Typical repetition rate of muscle
motor unit firing is about 7-20HZ, depending on the size of muscle.
The very small duration, low amplitude
motor unit potentials with the very low amplitude early recruitment pattern observed only over proximal muscles and the absence of any form of spontaneous activity 3 weeks after the onset of weakness seem to be the characteristic EMG changes that correlated well with the clinical picture.
Their control needle EMG studies also showed their improvement with a full recruitment pattern and reinnervation of
motor units.
A repeat laryngeal EMG identified fibrillation potentials at rest and no
motor unit activation on attempted phonation.
Although this would assure a fast movement, it would involve less than maximum
motor unit involvement.
The lift consists of an upholstered swivel seat with two foldable armrests mounted to a
motor unit. The seat can be swiveled at the top of the stairs to obtain a safer mounting and dismounting position for the user.
in addition, tempo running mimics the pattern of muscle
motor unit recruitment during actual competition.