e. Compare the frequency content of before and during contraction.
11.6 Import the data in the file “p_11_6.csv” and plot the signal.* In order to do so,
use File/Import Data … on the main MATLAB menu and follow the steps in
loading and naming of the data. The file contains the signals of a two-electrode
EMG recording of 10 different muscle groups of a person standing erect and at
rest. The scanning rate was 60,000 Hz.
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the recording
EMG1, the adductor: EMG6, and the tibia anterior: EMG7.
b. U sing “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG6 and EMG7.
e. C ompare the frequency content of both EMG6 and EMG7 before and
during contraction.
11.7 I mport the data in the file “p_11_6.csv” and plot the signal.* In order to do so,
use File/Import Data … on the main MATLAB menu and follow the steps in
loading and naming of the data. The file contains the signals of a two-electrode
EMG recording of the gluteus maximus. The scanning rate was 60,000 Hz.
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the recording
EMG2, EMG3, and EMG4.
b. U sing “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG3 and EMG4.
e. Co mpare the frequency content of both EMG3 and EMG4 before and during
contraction.
235
Electromyogram
* Courtesy of Edmund Cramp, Motion Lab Systems, Inc., Baton Rouge, LA. http://www.motion-labs.com
11.6 Import the data in the file “p_11_6.csv” and plot the signal.* In order to do so,
use File/Import Data … on the main MATLAB menu and follow the steps in
loading and naming of the data. The file contains the signals of a two-electrode
EMG recording of 10 different muscle groups of a person standing erect and at
rest. The scanning rate was 60,000 Hz.
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the recording
EMG1, the adductor: EMG6, and the tibia anterior: EMG7.
b. U sing “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG6 and EMG7.
e. C ompare the frequency content of both EMG6 and EMG7 before and
during contraction.
11.7 I mport the data in the file “p_11_6.csv” and plot the signal.* In order to do so,
use File/Import Data … on the main MATLAB menu and follow the steps in
loading and naming of the data. The file contains the signals of a two-electrode
EMG recording of the gluteus maximus. The scanning rate was 60,000 Hz.
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the recording
EMG2, EMG3, and EMG4.
b. U sing “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG3 and EMG4.
e. Co mpare the frequency content of both EMG3 and EMG4 before and during
contraction.
235
Electromyogram
* Courtesy of Edmund Cramp, Motion Lab Systems, Inc., Baton Rouge, LA. http://www.motion-labs.com