Summary: Emg
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Read the summary and the most important questions on EMG
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HC1
This is a preview. There are 4 more flashcards available for chapter 01/05/2017
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What aspects form the EMG signal characteristics?
Central nervous drive
Action potential propagation
Force, moment, movement -
What are a few methods to quantify EMG amplitude?
Root mean square
Rectified and averaged
Rectified and integrated
Peak to peak -
Of what parts does a motor unit consist?
Motorneuron
Nerve fibre
Nerve twigs
endplate -
How does an action potential move once in the muscle fibre?
From the endplate it moves in two directions -
What is the highest firing frequency of motor units?
25-30 Hz -
What is the size principle?
The more force that is required the more and bigger motor units will fire. -
What is the influence of firing rate on force?
Is of influence to about 30 firings/sec an increase does not increase force much -
By what are EMG amplitude and muscle force determined?
Recruitment of new motor units
Increase of firing rate per motor unit -
What limits the motorneuron firing rate?
After hyper polarization -
What causes the non regular firing pattern of a motor unit?
Synaptic noise
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