8/20/2019 LEB03_01
1/324 PHYWE Systeme GmbH & Co. KG · D-37070
GöttingenLaboratory Experiments, Biology
Musculature LEB 03
03.01 Electromyography (EMG) on the upper arm
Principle and tasks:
To prepare an electromyogram (EMG)from a contracting or relaxing
upperarm muscle (biceps) using surfaceelectrodes. Measurement of
thefrequency and the amplitude of theEMG at maximum
contraction.
Attaching the electrodes
What you can learn about
Electromyogram
Muscle contractions
Biceps
Muscle potentials
Compound action potentials
Cobra3 Basic Unit 12150.00 1
Power supply, 12 V 12151.99 1
RS232 data cable 14602.00 1Cobra3 Universal Recorder software
14504.61 1
Bio-amplifier 65961.93 1
EMG electrodes, 3 off 65981.02 1
Electrode collecting cable 65981.03 1
Electrode cream, tube 65981.05 1
Connecting cord, 32 A, l = 25 cm, red 07360.01 1
Connecting cord, 32 A, l = 25 cm, blue 07360.04 1
Roll of adhesive tape (e.g. Elastoplast)
PC, Windows® 95 or higher
What you need:
Electromyography (EMG) on the upper armP4030111
Typical result
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Results and evaluation
— No large amplitudes are to be seen when the muscle
is at rest.
When the muscle is flexed, numerous large muscle
potentials (compound action potentials) are to be
seen (Fig. 4)
— The frequency of the EMG is between 50 and 100 HZ
at maximum contraction. The amplitude of the EMG is
dependent on many factors, such as the attachment
of the electrodes, for example. It is 0.6 mV in the mea-
surement shown (take the 1000 times amplification
into consideration!)
Phywe Series of publication • Laboratory Experiments Biology • ©
PHYWE SYSTEME GMBH & Co. KG • D-37070 Göttingen4030134
LEB
03.01Electromyography (EMG) on the upper arm
Fig 3: Measurement parameters
Fig. 4: Typical result
