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Lecture 5

PSYCH257 Lecture Notes - Lecture 5: Dialog Box, Data Analysis, Myofibril


Department
Psychology
Course Code
PSYCH257
Professor
Allison Kelly
Lecture
5

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1
BIO 240 Week 6 Workshee t Names______________________________
GRIP STRENGTH AND ELECTROMYOGRAM (EMG) ACTIVITY, part 1
The equipment should be assembled when you come into the lab. Working in pairs, choose the
Subject and the Experimenter. Both of you should read the lab and be sure that you understand
what you are doing before you do it.
Start the Software
o Double click the LabScribe icon on the desktop.
o Click the Settings menu.
o Select Load Group.
o From the dialog box, select IPLMv4.iwxgrp. Click Load.
o Click on the Settings menu again.
o Select EMG-GripStrength. This is found under human muscle. In a second or two, the
lab manual itself will spear. X out and two or three windows will appear on the screen
(EMG, EMG Integral, and Force).
Calibrating the Hand Dynamometer
o Collect 4-5 textbooks and weigh them in kilograms on the scale. __________kg
o (1 kilogram = 2.2 lbs)
o Record the weight of the stack in kilograms in the Journal. To open the Journal click on
the Journal button in the LabScribe toolbar.
o Lay the hand dynamometer on the bench top.
o In the upper right hand corner of the screen, click Start and record for 10 seconds (watch
the lower right hand of the screen to follow the clock).
o After 10 seconds, place the stack of books on the dynamometer.
o Measure for 10 more seconds, then click Stop at the upper right hand side of the screen.
o Click each of the Autoscale words found associated with each window on the screen.
o Use the Double Display Time icons (3rd and 4th from the left of the Toolbar at the top of
the screen) to adjust the time display on the screen so you can see the time before and the
time after the books were placed on the dynamometer.
The button to the left (big mountain) changes the display time to 5 seconds.
The button to the right (small mountains) displays 20 seconds. (This is probably
the one to use.)
o Click the 2-Cursor icon (2nd from the left on the Toolbar) and two blue vertical lines will
appear over the screens. In the third window (force), place the left-hand cursor on the flat
line before the upward deflection (no books) and place the right hand cursor on the flat
line after the upward deflection. (after placement of books) (Do this by placing the cursor
over the line, holding down the left mouse button, and dragging it where you want it.)
o Right click in the data display area of the 3rd window (force).
Select Units and Simple from the submenu to open the Simple Units Conversion
Dialogue Window
Put check marks in the boxes next to Apply Units to new data and Apply Units to
all blocks. Click on the units off button to remove any prior units conversion from
this channel.
For Value at Cursor 1, type 0 in the box on the right
For Value at Cursor 2, type the mass of the books (from _____kg above)
For Name, type kg, and then click OK.
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EXERCISE 1: EMG INTENSITY AND FORCE
Procedure
o The Subject should attach the three color-coded electrodes on her dominant
forearm as shown in Figure HM-1-4, and then rest her arm on the tabletop.
o Sitting quietly, the Subject will clench and release her fist around the
dynamometer 4 times. Each clench is for 2 seconds, followed by 2 seconds of
rest. Each clench should be stronger than the one before it. The 4th clench should
be full strength.
o Click the Start button to begin recording. Immediately type “Increasing
Clenches” in the comment line to the right of the Mark button. Press the Enter
key on the keyboard. The Subject should begin the hand clenches. After the 4th
clench, press Stop.
o Click Autoscale for all 3 channels.
Top graph = actual recorded EMG
Middle graph = EMG integral = mathematically transformed EMG
Lower graph = force produced by the hand clench
o Click File (from the upper menu bar), than Save As, Student Data, Name, Save
Data Analysis
o If necessary, use the Display Time icons to get all 4 clenches on the screen.
o Click the 2-Cursor icon and bracket the 4 clenches (flat to the left of the first
clench and the flat line to the right of the fourth clench).
o Click the Analysis icon (11th from the right on the toolbar).
o Look at the Function Table that is above the uppermost channel displayed in the
Analysis window. The mathematical functions, Abs. Area, V2-V1, and T2-T1
should appear in this table. The values for Abs. Area, V2-V1, and T2-T1 on each
channel are seen in the table across the top margin of each channel.
o Place the 2 cursors on either side of the 1st raw EMG cluster. Record Absolute
Area of EMG Activity and Absolute Area under Force Curve in the table provided
below.
o Repeat all of the above for the 2nd, 3rd, and 4th hand clenches.
Hand
clenches
Absolute Area of EMG
Activity
Absolute Area under Force
Curve
Lowest
Higher 1
Higher 2
Highest
Do the following:
1. On the graph provided below, plot the absolute area under Force for the muscle
clenches as a function of the absolute area under the EMG for each muscle
clench.
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