Motor unit pool organization examined via spike-triggered averaging of the surface electromyogram
نویسندگان
چکیده
منابع مشابه
Motor unit pool organization examined via spike-triggered averaging of the surface electromyogram.
Voluntary muscle force control is accomplished both by recruitment of motor units (MUs) and by firing rate modulation of active MUs. Typically, MU recruitment and firing rate organization is assessed using piecemeal intramuscular recordings drawn from different experiments, or even from different subjects. As a consequence, it is often difficult to assemble a systematic description of the relat...
متن کاملAmplitude cancellation of motor-unit action potentials in the surface electromyogram can be estimated with spike-triggered averaging.
The study presents analytical, simulation, and experimental analyses of amplitude cancellation of motor-unit action potentials (APs) in the interference electromyogram (EMG) and its relation to the size of the spike-triggered average (STA) EMG. The amount of cancellation of motor-unit APs decreases monotonically as a function of the ratio between the root mean square (RMS) of the motor-unit AP ...
متن کاملCorrection: Limitations of the Spike-Triggered Averaging for Estimating Motor Unit Twitch Force: A Theoretical Analysis
Contractile properties of human motor units provide information on the force capacity and fatigability of muscles. The spike-triggered averaging technique (STA) is a conventional method used to estimate the twitch waveform of single motor units in vivo by averaging the joint force signal. Several limitations of this technique have been previously discussed in an empirical way, using simulated a...
متن کاملEstimating motor unit discharge patterns from high-density surface electromyogram.
OBJECTIVE We systematically tested the capability of the Convolution Kernel Compensation (CKC) method to identify motor unit (MU) discharge patterns from the simulated and experimental surface electromyogram (sEMG) during low-force contractions. METHODS sEMG was detected with a grid of 13 x 5 electrodes. In simulated signals with 20 dB signal-to-noise ratio, 11+/-3 out of 63 concurrently acti...
متن کاملDistribution of motor unit force in human extensor digitorum assessed by spike-triggered averaging and intraneural microstimulation.
A peculiar aspect of the muscular organization of the human hand is that the main flexors and extensors of the fingers are muscles that each give rise to four parallel tendons that insert on all the fingers. It has been hypothesized that these multi-tendoned muscles are comprised of functional compartments, with each finger controlled by a discrete population of motor units. The purpose of this...
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ژورنال
عنوان ژورنال: Journal of Neurophysiology
سال: 2013
ISSN: 0022-3077,1522-1598
DOI: 10.1152/jn.00301.2012