Electromyography - EMG Flashcards
If the amplitude is increased on an EMG, what does that mean?
more MUs recruited
If the frequency decreases on an EMG, what does that mean?
MUs firing slower
What can we interpret from the amplitude of an EMG signal
muscle force, muscle activation
What can we interpret from the frequency of an EMG signal
muscle fatigue, muscle biomechanics
Where should the electrode be placed?
over the muscle belly
The electrode pair should be ____ to the muscle fiber
parallel
The individual electrode should be _______ to the muscle fiber (if not round)
perpendicular
EMG _____ neural impulse
follows
EMG ______ contraction and tension development
precedes
Frequency Content of EMG is mostly between ____ and ____ Hz
10,500
What happens to Mean Power Frequency with fatigue
downward shift of 20-40 Hz with fatigue
(a normal MPF = 80-120 Hz
Linear envelope is a force
APPROXIMATION
North American Electrical Grid Frequency
60 Hz
Frequency of Human movement
6-10 Hz
European Electrical Grid Frequency
50 Hz
