Data Analysis (Note: Print 1 per student)
ELECTROMYOGRAPHY I
Standard and Integrated EMG
DATA REPORT
Student’s Name: Valerie Lallo
Lab Section:
Date: 5/31/18
I. Data and Calculations
Subject Profile
Name: Valerie Lallo
Age: 19 years old
Height 5’3”
Weight: 120
Gender: Male / Female
Dominant arm: Right / Left
A. EMG Measurements
Dominant arm
Non-dominant arm
Cluster #
1
0.0711 mV-sec
0.106
2
0.112
0.114
3
0.152
0.143
4
0.220
0.143
Note: "Clusters" are the EMG bursts associated with each clench.
B. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded
between the weakest clench and the strongest clench of Forearm 1.
Calculation:
% diff = (max-min)/max
%diff = (0.220-0.071)/0.220
Answer: 68%
C. Tonus Measurements
Between
Clusters #
Dominant arm
Non-dominant arm
1-2
0.009 mV-sec
0.021
2-3
0.015
0.015
3-4
0.033
0.014
ELECTROMYOGRAPHY I
Standard and Integrated EMG
DATA REPORT
Student’s Name: Conor Stefanowicz
Lab Section:
Date: 5/31/18
II. Data and Calculations
Subject Profile
Name: Conor
Height: 5’9”
Age: 19
Weight: 230
Gender: Male / Female
Dominant arm: Right / Left
D. EMG Measurements
Dominant arm
Non-dominant arm
Cluster #
1
0.025 mV-sec
0.049
2
0.045 mV-sec
0.095
3
0.078 mV-sec
0.132
4
0.142 mV-sec
0.246
Note: "Clusters" are the EMG bursts associated with each clench.
E. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded
between the weakest clench and the strongest clench of Forearm 1.
Calculation:
% diff = (max-min)/max
%diff = (0.246-0.025)/0.246
Answer: 89%
F.
Tonus Measurements
Between
Clusters #
Dominant arm
Non-dominant arm
1-2
0.010 mV-sec
0.013
2-3
0.010
0.014
3-4
0.012
0.014
ELECTROMYOGRAPHY I
Standard and Integrated EMG
DATA REPORT
Student’s Name: Mansour Al Awami
Lab Section:
Date: 5/31/18
III.
Data and Calculations
Subject Profile
Name: Mansour
Height: 5’03”
Age: 22
Weight: 130
Gender: Male / Female
Dominant arm: Right / Left
G. EMG Measurements
Dominant arm
Non-dominant arm
Cluster #
1
0.106 mV-sec
0.119 mV-sec
2
0.134
0.145
3
0.167
0.139
4
0.125
0.179
Note: "Clusters" are the EMG bursts associated with each clench.
H. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded
between the weakest clench and the strongest clench of Forearm 1.
Calculation:
% diff = (max-min)/max
%diff = (0.179-0.106)/0.179
Answer: 41%
I.
Tonus Measurements
Between
Clusters #
Dominant arm
Non-dominant arm
1-2
0.019 mV-sec
0.026
2-3
0.014
0.025
3-4
0.019
0.021
ELECTROMYOGRAPHY I
Standard and Integrated EMG
DATA REPORT
Student’s Name: Kayla Battaglioli
Lab Section:
Date: 5/31/18
IV.
Data and Calculations
Subject Profile
Name: Kayla
Height: 5’06”
Age: 20
J.
Weight:
Gender: Male / Female
Dominant arm: Right / Left
EMG Measurements
Dominant arm
Non-dominant arm
Cluster #
1
0.055 mV-sec
0.034 mV-sec
2
0.051 mV-sec
0.072 mV-sec
3
0.091 mV-sec
0.124 mV-sec
4
0.127 mV-sec
0.171 mV-sec
Note: "Clusters" are the EMG bursts associated with each clench.
K. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded
between the weakest clench and the strongest clench of Forearm 1.
Calculation:
% diff = (max-min)/max
%diff = (0.171-0.034)/0.171
Answer: 80%
L. Tonus Measurements
Between
Clusters #
Dominant arm
Non-dominant arm
1-2
0.014 mV-sec
0.012 mV-sec
2-3
0.018 mV-sec
0.014 mV-sec
3-4
0.019 mV-sec
0.012 mV-sec
BME 303 – Lab 2
Electromyography (EMG)
Dr. Anita Singh
IntroducCon
• Muscular system consists of three muscle
types: cardiac, smooth, and skeletal
• Skeletal muscle most abundant Cssue in
the human body (40-‐45% of total body
weight)
• Human body has more than 430 pairs of
skeletal muscle; most vigorous movement
produced by 80 pairs
IntroducCon (conCnued)
• Skeletal muscles provide strength and
protecCon for the skeleton, enable bones
to move, provide the maintenance of body
posture against gravity
• Skeletal muscles perform both dynamic and
staCc work
Muscle Structure
• Structural unit of skeletal muscle
– is the mulCnucleated muscle cell or fiber
(thickness: 10-‐100 µm, length: 1-‐30 cm)
• Muscle fibers consist of myofibrils
(sarcomeres in series: basic contracCle unit
of muscle)
• Myofibrils consist of myofilaments
– acCn and myosin
Sliding Mechanism
Microscopic-‐
Macroscopic
Structure of
Skeletal
Muscle
Muscle Structure (conCnued)
• Motor unit
– FuncConal unit of muscle contracCon
– Composed of motor neuron and all muscle
cells (fibers) innervated by motor neuron
– Follows “all-‐or-‐none” principle – impulse from
motor neuron will cause contracCon in all
muscle fibers it innervates or none
Muscle Structure (conCnued)
• Motor unit
– Vary in raCo of muscle fibers/motor neuron
• Fine control – few fibers (e.g., muscles of eye and
fingers, as few as 3-‐6/motor neuron), tetanize at
higher frequencies
• Gross control – many fibers (e.g., gastrocnemius, ≅
2000/motor neuron), tetanize at lower frequencies
– Fibers of motor unit dispersed throughout
muscle
•Smallest MU
recruited at lowest
stimulation
frequency
•As frequency of
stimulation of
smallest MU
increases, force of its
contraction increases
•As frequency of
stimulation continues
to increase, but not
before maximum
contraction of
smallest MU, another
MU will be recruited
Size Principle
• Smallest motor units recruited first
• Smallest motor units recruited with lower
sCmulaCon frequencies
• Smallest motor units with relaCvely low
levels of tension provide for finer control of
movement
• Larger motor units recruited later with
increased frequency of sCmulaCon and
increased need for greater tension
Size Principle
• Tension is reduced by the reverse process
– Successive reducCon of firing rates
– Dropping out of larger units first
Force ProducCon –
GradaCon of ContracCon
• SynchronizaCon (number of motor units acCve
at one Cme) – more ⇒ ↑ force potenCal
• Size of motor units – motor units with larger
number of fibers have greater force potenCal
• Type of motor units – type IIA and IIB ↑ force
potenCal, type I ↓ force potenCal
Force ProducCon –
GradaCon of ContracCon (conCnued)
• SummaCon – increase frequency of sCmulaCon,
to some limit, increases the force of contracCon
Shape of Graded ContracCon
Types of Muscle ContracCon
Type of Contraction
Definition
Work
Concentric
Force of muscle contraction
> resistance
Positive work; muscle
moment and angular velocity
of joint in same direction
Eccentric
Force of muscle contraction
< resistance
Negative work; muscle
moment and angular velocity
of joint in opposite direction
Isokinetic
Force of muscle contraction Positive work; muscle
= resistance; constant
moment and angular velocity
angular velocity; special case of joint in same direction
is isometric contraction
Isometric
Force of muscle contraction
< resistance; series elastic
component stretch =
shortening of contractile
element (few to 7% of
resting length of muscle)
No mechanical work;
physiological work
Force ProducCon –
Length-‐Tension RelaConship
• Force of contracCon in a single fiber
determined by overlap of acCn and myosin
(i.e., structural alteraCons in sarcomere) (see
figure)
• Force of contracCon for whole muscle must
account for acCve (contracCle) and passive
(series and parallel elasCc elements)
components
Musculotendinous Unit
• Tendon and connecCve Cssues in muscle
(sarcolemma, endomysium, perimysium, and
epimysium) are viscoelasCc
• ViscoelasCc structures help determine
mechanical characterisCcs of muscles during
contracCon and passive extension
Musculotendinous Unit (conCnued)
• FuncCons of elasCc elements of muscle
– Keep “ready” state for muscle contracCon
– Contribute to smooth contracCon
– Reduce force buildup on muscle and may prevent
or reduce muscle injury
– ViscoelasCc property may help muscle absorb,
store, and return energy
Force ProducCon –
Length-‐Tension RelaConship
• Difficult to study length-‐tension relaConship
– Difficult to isolate single agonist
– Moment arm of muscle changes as joint angle
changes
– Modeling may facilitate this type of study
Force ProducCon –
Load-‐Velocity RelaConship
• Concentric contracCon (muscle shortening)
occurs when the force of contracCon is
greater than the resistance (posiCve work)
• Velocity of concentric contracCon inversely
related to difference between force of
contracCon and external load
• Zero velocity occurs (no change in muscle
length) when force of contracCon equals
resistance (no mechanical work)
Force ProducCon –
Load-‐Velocity RelaConship
• Eccentric contracCon (muscle lengthening)
occurs when the force of contracCon is less
than the resistance (negaCve work)
• Velocity of eccentric contracCon is directly
related to the difference between force of
contracCon and external load
Force ProducCon –
Force-‐Time RelaConship
• In isometric contracCons, greater force can be
developed to maximum contracCle force, with
greater Cme
• Increased Cme permits greater force generaCon
and transmission through the parallel elasCc
elements to the series elasCc elements (tendon)
• Maximum contracCle force may be generated in
the contracCle component of muscle in 10 msec;
transmission to the tendon may take 300msec
EMG
• EMG: Technique that allows to measure
the signal generated by skeletal muscles
that allow us to move.
• It incorporates central control strategies,
signal transmission along nerve fibers and
across neuromuscular juncCons, electrical
acCvaCon of the muscle fibers organized in
elementary motors (the motor units) and,
through a chain of complex biochemical
events, the producCon of forces acCng on
the tendons of the agonist and/or
antagonist muscles and moving the bones.
EMG
• It also incorporates a number of feedback circuits relaying
back to the spinal cord and the brain informaCon
concerning the length and velocity of shortening of the
muscles and the forces acCng on the tendons.
• Through these mechanisms we can hold a flower without
crushing it, play a violin or a piano, lih a weight, climb a
mountain, or hit a compeCtor in a boxing match.
0.051mm, insulated, hooked wires
25 Gauge Needle
Surface Electrodes
• Because of the blurring introduced by the Cssue
interposed between the sources and the
electrodes, informaCon is lost.
• For this reason the interpretaCon of surface EMG
is much more challenging than needle EMG;
however, the noninvasiveness and the ease of use
of the technique contributed to its large diffusion
in many applicaCons ranging for biofeedback, to
movement analysis, to faCgue assessment.
Needle Electrode
BME 303: Biomedical Engineering Laboratory I
Experiment #2: Electromyography (EMG)
Notes:
1. Each test should be performed on atleast one male and one female student in your group.
2. You will be sharing your data with your group members, so you must include the data from each
group member in your individual lab reports.
Experiments:
***At this time, you should attach the electrodes to each student as show in Figure 1.3***
1. Electromyography
I.
EXPERIMENTAL OBJECTIVES
1) To observe and record skeletal muscle tonus as reflected by a basal level of electrical activity associated with the
muscle in a resting state.
2) To record maximum clench strength for right and left hands.
3) To observe, record, and correlate motor unit recruitment with increased power of skeletal muscle contraction.
4) To listen to EMG “sounds” and correlate sound intensity with motor unit recruitment.
II.
MATERIALS
•
BIOPAC electrode lead set (SS2L)
•
BIOPAC disposable vinyl electrodes (EL503), 6 electrodes per Subject
•
BIOPAC electrode gel (GEL1) and abrasive pad (ELPAD) or Skin cleanser or alcohol prep
•
Optional: BIOPAC Headphones (OUT1 for MP3X or 40HP for MP45)
•
Biopac Student Lab System: software BSL 3.7.7 or above
data acquisition unit MP36, MP35, MP30 (Windows only), or MP45
•
Computer system
III. EXPERIMENTAL METHODS
For further explanation, use the online support options under the Help Menu.
A.
SETUP
FAST TRACK
1.
2.
3.
4.
5.
6.
DETAILED EXPLANATION
Turn the computer ON.
The desktop should appear on the monitor. If it does not appear, ask the
Make sure the BIOPAC MP3X unit is OFF. laboratory instructor for assistance.
Plug the equipment in as follows:
Electrode lead (SS2L) — CH 1
Headphones (OUT1) — back of unit
Turn ON the BIOPAC MP3X unit.
Attach three electrodes to each
forearm (Fig. 1.3).
Attach the electrode lead set (SS2L) to
Subject’s dominant forearm, following the
• If using 40HP for MP45, the Sound
color code (Fig. 1.3).
Playback device must be set to MP45
via Start > Control Panel.
Fig. 1.2 MP3X (left) and MP45 (right) equipment connections
IMPORTANT
Make sure the electrode lead colors
match Fig. 1.3.
Attach three electrodes to
each forearm as shown in
Fig. 1.3.
• You will switch the lead
set to the Subject’s nondominant arm for
recording Segment 2
(Forearm 2).
Setup continues…
Fig. 1.3 Electrode placement and lead attachment
7.
8.
9.
Start the Biopac Student Lab Program.
Choose lesson “L01” and click OK.
Type in a unique filename and click
OK.
10. Optional: Set Preferences.
• Choose File > Preferences.
• Select an option.
• Select the desired setting and click
OK.
END OF SETUP
▪
If Subject is right-handed, the right forearm is generally dominant; if
Subject is left-handed, the left forearm is generally dominant.
▪
For optimal electrode adhesion, place electrodes on the skin at least 5
minutes before the start of Calibration.
▪
The electrode lead cables are each a different color and each must be
attached to a specific electrode position, as shown in Fig. 1.3.
▪
The pinch connectors work like a small clothespin and will only latch onto
the nipple of the electrode from one side of the connector.
Lesson L01 is Electromyography (EMG) I.
No two people can have the same filename, so use a unique identifier, such as
Subject’s nickname or student ID#.
This ends default Setup.
This lesson has optional Preferences for data and display while recording. Per
your Lab Instructor’s guidelines, you may set:
Journal Text: show minimum guiding text vs. detailed text
Grids: show or hide gridlines
Lesson Segments: Specific recording segments may be omitted based on
instructor’s preferences.
B.
CALIBRATION
Calibration establishes the hardware’s internal parameters (such as gain, offset, and scaling) and is critical for optimum
performance. Pay close attention to Calibration.
FAST TRACK Calibration
1.
Click Calibrate.
2.
Clench fist as hard as possible, then
release.
DETAILED EXPLANATION OF CALIBRATION STEPS
This will start the Calibration recording.
The program needs a reading of
the maximum clench to perform
an auto-calibration.
Fig. 1.4 Clench Fist for Calibration
3.
Wait for Calibration to stop.
Calibration will last eight seconds and stop automatically, let it run its course.
4.
Check the Calibration data.
At the end of the eightsecond Calibration
recording, the screen
should resemble Fig.1.5.
If the calibration recording
does not show a zero
baseline and a burst (when
Subject clenched), repeat
calibration to obtain a
reading similar to Fig. 1.5.
• If similar, proceed to the Data
Recording section.
• If different, Redo Calibration.
END OF CALIBRATION
Fig. 1.5
C.
DATA RECORDING
FAST TRACK Recording
1.
Prepare for the recording.
*IMPORTANT
This procedure assumes that all
lesson segments are enabled in
lesson Preferences, which may
not be the case for your lab.
Always match the segment title
to the segment reference in the
journal and disregard any
references to excluded segments.
DETAILED EXPLANATION OF RECORDING STEPS
You will record two segments*:
a. Segment one records Dominant arm.
b. Segment two records Non-dominant arm.
To work efficiently, read this entire section before recording.
Dominant arm
2.
Click Record.
3.
Perform a series of four Clench (hold for 2 Repeat a cycle of Clench-Release-Wait, holding for 2 seconds and waiting for
sec.)-Release-Wait (for 2 sec.) cycles.
two seconds after releasing before beginning the next cycle. Try to increase the
• Begin with a weak clench, and then strength in equal increments such that the fourth clench is the maximum force.
increase in equal increments so the
fourth clench is at maximum.
4.
5.
Click Suspend.
Review the data on the screen.
•
When you click Record, the recording will begin and an append marker
labeled “Dominant arm” will automatically be inserted.
The recording should halt, giving you time to review the data and prepare for
the next recording segment. The data should look similar to Fig. 1.6.
If similar, proceed to Step 6.
Fig. 1.6 Clench, Release, Wait, Repeat
•
If different, click Redo and repeat
Steps 2-5.
The data would be different if the:
a. The Suspend button was pressed prematurely.
b. Instructions were not followed.
Click Redo and repeat Steps 2-5 if necessary. Note that once you press Redo,
the data you have just recorded will be erased.
Non-dominant arm segment
6.
For Non-dominant arm, attach electrode
leads to Subject’s opposite arm.
Remove the electrode cable pinch connectors from the “Dominant arm”
electrodes and connect to “Non-dominant arm” electrodes. Refer to Setup
Steps 5-6 and Fig 1.3 for proper electrode placement and lead attachment.
7.
Click Resume.
Recording continues…
When you click Resume, the recording will continue and an append marker
labeled “Non-dominant arm” will be automatically inserted.
8.
Perform a series of four Clench (hold for 2 Repeat a cycle of Clench-Release-Wait, holding for 2 seconds and waiting for
sec.)-Release-Wait (for 2 sec.) cycles.
two seconds after releasing before beginning the next cycle. Try to increase the
strength in equal increments such that the fourth clench is the maximum force.
• Begin with a weak clench, and then
increase in equal increments so the
fourth clench is at maximum.
9.
Click Suspend.
10. Review the data on the screen.
•
If similar, go Step 11.
•
If different, click Redo and repeat
Steps 7-10.
The recording should halt, giving you time to review the data for the nondominant arm segment.
If all went well, your data should look similar to Fig. 1.6. The data would be
different if the:
a. The Suspend button was pressed prematurely.
b. Instructions were not followed.
If your data did not match Fig. 1.6, click Redo and repeat Steps 7-10. Note
that once you press Redo, the data you have just recorded will be erased.
11. Click Stop and then click Yes.
When you click Stop, you will be prompted to confirm that you are sure you
want to stop the recording. Clicking “yes” will end the data recording
segment, and automatically save the data. Clicking “no” will bring you back to
the Resume or Stop options. This is simply one last chance to confirm you
don’t need to redo the last recording segment.
12. If you want to listen to the EMG signal,
go to Step 13.
Or
If you want to end the recording, go to
Step 17.
Listening to the EMG can be a valuable tool in detecting muscle
abnormalities, and is performed here for general interest.
Listening to the EMG is optional. The data from this part of the Lesson will
not be saved. EMG data is sent to the headphones and simultaneously plotted
so you can listen to the signal and see it at the same time. Note the increase
in sound intensity as you increase the strength of your clench.
13. Subject puts on the headphones.
14. Click Listen.
You will hear the EMG signal through the headphones as it is being displayed
on the screen. The screen will display two channels:
CH 1 EMG and CH 40 Integrated EMG
or for MP30 under Windows: CH 3 EMG and CH 40 Integrated EMG
The data on the screen will not be saved.
Note The volume through the headphones may be very loud due to system
feedback. Position the headphones slightly off the ear to reduce the
volume or, if using an MP45 system, use the Volume + or Volume –
buttons.
The signal will run until you press Stop.
If others in your lab group would like to listen to the EMG signal, pass the
headphones around before clicking Stop.
•
If using an MP30 under Windows
OS: switch the SS2L Lead Set from
CH 1 to CH 3 for the listening
segment and click OK when
prompted.
15. Experiment by changing the clench force
as you watch the screen and listen.
Recording continues…
16. Click Stop.
•
To listen again: click Redo, listen,
and then click Stop.
ACTIVE LEARNING PORTION
This will end listening to the EMG.
If another person wants to listen to the EMG, switch the headphones from
Subject to the new person and click Redo.
With this lesson you may record additional data segments. Design an
experiment to test or verify a scientific principle(s) related to topics covered
in this lesson. You are limited to this lesson’s channel assignments; however
the electrodes may be moved to different locations on the subject.
Design Your Experiment
Use a separate sheet to detail your experiment design, and be sure to address
these main points:
A. Hypothesis
Describe the scientific principle to be tested or verified.
B. Materials
List the materials will you use to complete your investigation.
C. Method
Describe the experimental procedure—be sure to number each step to make it
easy to follow during recording. Run Your Experiment
D. Set Up
Set up the equipment and prepare the subject for your experiment.
E. Record
Use the Resume, and Suspend buttons to record as many segments as
necessary for your experiment.
Click Stop when you have completed all of the segments required for
your experiment.
Analyze Your Experiment
Set measurements relevant to your experiment and record the results in a Data
Report.
17. Click Done.
18. Choose an option and click OK.
19. Remove the electrodes.
END OF RECORDING
IV.
Disconnect the lead cables. Peel off and discard the electrodes (BIOPAC
electrodes are not reusable). Wash the electrode gel residue from your skin
using soap and water. The electrodes may leave a slight ring on the skin for a
few hours, which is quite normal.
DATA ANALYSIS
FAST TRACK Data Analysis
1.
A dialog with options will be generated. Make your choice, and continue as
directed.
If choosing the “Record from another Subject” option:
a) Attach electrodes per Setup Steps 5-6 and continue the entire lesson
from Setup Step 8.
Each person will need to use a unique file name.
Enter the Review Saved Data mode and
choose the correct file.
• Note Channel Number (CH)
designations:
Channel
Displays
DETAILED EXPLANATION OF DATA ANALYSIS STEPS
Enter the Review Saved Data mode.
CH 1
CH 40
•
EMG
Integrated EMG
Note measurement box settings:
Channel
Measurement
CH 40
Mean
Fig. 1.7
The measurement boxes are above the marker region in the data window. Each
measurement has three sections: channel number, measurement type, and result.
The first two sections are pull-down menus that are activated when you click
them. The following is a brief description of these specific measurements.
Mean: displays the average value in the selected area.
The “selected area” is the area selected by the I-Beam tool (including endpoints).
Record measurement data individually by hand or choose Edit > Journal >
Paste measurements to paste the data to your journal for future reference.
2.
Set up your display window for optimal
viewing of the first segment of Integrated
EMG data.
•
Optional: Hide CH 1 data by using
“Ctrl-click” (Windows) or
“Option+click” (Mac) on the channel
number box.
Data Analysis continues…
The first recording segment begins at the marker labeled “Dominant arm” and
includes four clenches from Subject’s dominant arm.
The following tools help you adjust the data window:
Display menu: Autoscale horizontal, Autoscale waveforms, Zoom Previous
Scroll Bars: Time (Horizontal); Amplitude (Vertical)
Cursor Tools: Zoom Tool
Buttons: Overlap, Split, Show Grid, Hide Grid
Channel Display: “Ctrl-click” (Windows) or “Option+click” (Mac) the
channel number box to toggle channel display.
3.
Use the I-Beam cursor to select an area
on the plateau of the first EMG cluster
(Fig. 1.8).
"Clusters" are the EMG bursts associated with each clench. Fig. 1.8 below
shows an EMG cluster selection in the first data segment.
A
4.
Repeat Step 3 on each successive EMG
cluster.
A
Fig. 1.8 EMG cluster selection
5.
6.
Scroll to the second recording segment.
Repeat Steps 3 and 4 for non-dominant
arm data.
The second recording segment begins at the marker labeled “Non-dominant
arm” and includes four clenches from Subject’s non-dominant arm.
7.
8.
Scroll to the first recording segment.
Use the I-Beam cursor to select the area
between the first and second clenches
(Fig. 1.9).
Tonus is the resting state, and is represented by the area between clenches
(clusters). Fig. 1.9 below shows the selected area between clenches.
C
9.
Repeat Step 8 between each successive
clench.
10. Scroll to the second recording segment.
11. Repeat Steps 8-9 for non-dominant arm
data.
C
Fig. 1.9 Selection between clenches to measure tonus
12. Save or print the data file.
You may save the data to another location, save notes that are in the
journal, or print the data file.
13. Quit the program.
END OF DATA ANALYSIS
Data Analysis (Note: Print 1 per student)
ELECTROMYOGRAPHY I
Standard and Integrated EMG
DATA REPORT
Student’s Name:
Lab Section:
Date:
I. Data and Calculations
Subject Profile
Name
Age
Height
Gender: Male / Female
Weight
Dominant arm: Right / Left
A. EMG Measurements
Dominant arm
Non-dominant arm
Cluster #
1
2
3
4
Note: "Clusters" are the EMG bursts associated with each clench.
B. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded between the
weakest clench and the strongest clench of Forearm 1.
Calculation:
Answer:
%
C. Tonus Measurements
Between
Clusters #
1-2
2-3
3-4
Dominant arm
Non-dominant arm
X
Biopac Student Lab® - File:Connor_EMG-L01
File Edit Display Lessons Help
Overlap Split Show Grid Hide Grid
Copy Graph
40
Mean
****
SC
None
SC
None
sc
None
SC
None
140 EMG
Dominant arm
1
2.00
1.00
9
0.00
MY
-1.00
-2.00
0.55
AL
IN
U
17
0.35
mV-sec
लगी
0.15
A
-0.05
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
20.00
22.00
16.00 18.00
seconds
24.00
26.00
28.00
30.00
32.00
34.00 Ila
O
L01 - Electromyography (EMG) I (377.062810)
File name: Connor_EMG-L01
Thursday, May 31, 2018
01:00:34 PM
First segment (starts at marker labeled 'Dominant arm'): Four clench-release-wait cycles; fourth clench is maximum force.
Second segment (starts at marker labeled 'Non-dominant arm'): Four clench-release-wait cycles; fourth clench is maximum force.
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