1. EMG 2017 Wim Grooten
Quiz

2. What stands EMG for
Electronic myographics
Electromyography
Electromyog
E = M *g

3. 2. What can you do with the raw signal?
Compare amplitude levels between muscles
Compare timing (on/off) between muscles in ms
Compare fatigue between muscles
None of these three

4. 3. Which ways of normalization procedures could be appropriate in ergonomic studies?
% MVC (%maximum voluntary contraction)
%VC (%voluntary contraction)
% lifting 1 kg
% of baseline

5. 4. What do you know about power?
Power can be negative or positive, depending on the direction of the velocity and the acceleration
Power can measure endurance
Power is a measurement of performance

6. Think about the experiment we did on wednesday.
5. How can you discriminate between eccentric and concentric contractions
Compare the acceleration curves (direction) with the displacement curves (direction)
Look to the amplitude of the EMG curves
Compare the acceleration curves with the EMG signal
Compare the power curves and the EMG signals

7. Think about the Power spectrum.
6. What is the best way to make conclusions about a normal persons endurance?
You can look to the amplitude of the EMG
You can look to the number of gaps
You can study the frequency
You can study the shift of the median frequency

8. Think about the MOVING WINDOW filtering method
7. What negative aspects do you have with it
You cannot compare amplitudes anymore
You cannot compare the area under the curve
You have changed the time onsets of the EMG
You have increased the artefacts

9. Answers B
D, maybe B
Not B
A, B, C D C