|
In this Issue
- Stimulation of
Antagonistic Muscles
Experiment
- SI-200 Stimulus Isolator
Tech Note
- User Downloads
- Web Resources
- New
LabsByDesign
Custom Physiology Labs
------------------------------
The iWorx newsletter is a
FREE monthly publication dedicated to sharing teaching
laboratory techniques and other useful information with
educators in the fields of Anatomy and Physiology. We will
also be sending you technical information and info on new
developments at iWorx that we feel may be of use to you in
your teaching and research activities. |
|
About iWorx
iWorx has everything you need to add excitement and distance
learning to any physiology teaching program. Our products
include data acquisition hardware, professionally -developed
physiology courseware, innovative web tools, and a full
selection of transducers, cables, front ends and
accessories.
iWorx/CB Sciences
One Washington St.
Suite 404
Dover, NH 03820
P: 800-234-1757
F: 603-742-2455
info@iworx.com
© 2008 CB Sciences, Inc. Patent pending. iWorx,
LabsByDesign, and LabScribe2 are trademarks of CB Sciences, Inc. |
|
|
March 2008 |
| |
Experiment:
Stimulation of Antagonistic Muscles
|
|
While
walking or running, the muscles of the lower leg work in a
coordinated manner to position the foot at the proper angle
during each segment of a person’s stride. As the leg is moved
forward after a step has been taken, the foot moves upward in a
dorsiflexion caused by the contraction of the tibialis anterior
muscle on the front of the lower leg. Dorsiflexion provides the
foot greater clearance from the ground as the foot is moved
forward. When the foot is planted and the person’s body is being
propelled forward, the foot moves downward in a plantar flexion
caused by the contraction of the gastrocnemius muscle on the
back of the lower leg. Plantar flexion helps push the body
forward as the leg is moved backward.
In
this experiment, dorsiflexion and plantar flexion will be
triggered by stimulation of the muscles involved in each
flexion. When stimulated, each muscle generates a compound
muscle action potential, known as a M-wave, which will be
recorded like an electromyogram (EMG). Each M-wave generates a
muscle contraction, which causes a flexion. The range of motion
of each flexion will be measured with a single-axis goniometer.
The frequency of stimulation of the muscles will also be
increased to demonstrate the effect of mechanical summation on
the overall range of motion of the foot. |
|
|
Browsing Area
Download locked Stimulation of
Antagonistic Muscles experiment.
|
iWorx Users Area
(password required)
Download
screen optimized or
print optimized Stimulation of
Antagonistic Muscles experiment. |
|
|
Tech
Note: SI-200 Isolated Stimulator
|
|
The SI-200 is a high voltage, isolated stimulator designed
to deliver safe, transcutaneous stimulus pulses to a nerve
or a muscle being studied. The design of the SI-200 permits
the desired current of the stimulus pulse to be generated
despite the impedance on the path that the current follows.
The SI-200 adjusts the voltage needed to maintain that
current automatically by increasing the voltage that drives
the current up to a maximum of 150 volts. Because of this
capability, the SI-200 is categorized as a constant current
stimulator. However, the current output of the SI-200 is
limited to a maximum of 20 milliamperes, with a maximum
duration of 10 milliseconds and a maximum frequency of 50Hz. |
SI-200 Stimulus Isolator
Learn
more about the iWorx SI-200 Stimulus Isolator
here, or view a
Tech Note
here.
|
|
|
|
Download the Updated Settings File for this Month's
Experiment with LabScribe2TM
Software |
|
If iWorx users plan to use the Stimulation of Antagonistic
Muscles experiment in
their course, they can obtain a copy of the settings file
used to configure the LabScribe2 recording software to do
this experiment by clicking
here
(zip file).
To learn
how to create your own groups of settings files for use with
LabScribe2, click
here. The new
Settings Manager in LabScribe2 permits numerous pieces of
support material to be linked to a settings file and opened
automatically when the settings file is selected from the
Settings menu. In LabScribe2, animations, illustrations,
movies, websites, experimental write-ups, and more can be
opened automatically when a settings file is opened.
|
|
Web Resources |
|
Find more sources of articles about
gait analysis and foot movement and range of motion by going to the
external Web resources
page.
On this
page
we have also accumulated a host of links to informative,
external physiology Web sites and conveniently categorized them
into major subcategories for easy reference.
|
|
|
|
|
Introducing iWorx
LabsByDesignTM:
Design the Physiology Labs that Best Suit Your Needs. |
|
iWorx new
LabsByDesign is the easiest
and most cost effective way for you to design the physiology
teaching labs that perfectly fit your needs. It's a
unique alternative to the one size fits all, canned approach
to standard lab systems that force you to purchase equipment
you don't need and will never use.
Use the
Web-based
LabsByDesign configurator
and choose the labs you want to teach. The
configurator will then tailor the necessary components from
our complete line of data recording modules, sensors,
electrodes, stimulators and other accessories along with the
courseware necessary to support the experiments you select.
Start
here to design your own lab
today.
|
|
|
|
|
|
|
