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In this Issue
- New Experiment:
Respiratory Exchange
Ratio
- GA-200 Gas Analyzer
- Web Resources
- iWorx 2007/2008
Catalog Now Available
- Special Limited-Time
Product Discounts
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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. |
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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.
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One Washington St.
Suite 404
Dover, NH 03820
P: 800-234-1757
F: 603-742-2455
info@iworx.com
© 2007 CB Sciences, Inc. Patent pending. iWorx is a trademark of CB Sciences, Inc. |
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September 2007 |
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Experiment: Respiratory Exchange Ratio (RER) |
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The
energy requirements of the body are met with a mixture of energy
derived from carbohydrates and fats. The type of activity being
performed determines the proportion of carbohydrates and fats
being utilized. As the intensity of activity increases, the
demand for energy increases, and a greater proportion of the
demand is met by the oxidation of carbohydrates. As the ratio
of energy supplied by fats and carbohydrates shifts during
changes in activity, the ratio of carbon dioxide produced to
oxygen consumed also shifts. The ratio of carbon dioxide
produced to oxygen consumed during cellular metabolism can be
measured by determining the changes in the concentrations of
oxygen and carbon dioxide in the air that passes into and out of
the lungs.
The amounts of oxygen consumed and carbon dioxide produced are
measured using an oxygen/carbon dioxide gas analyzer connected
to a spirometer. The GA-200 Gas Analyzer measures the
concentration of oxygen and carbon dioxide in inspired and
expired air while the spirometer determines the volumes of
inspired and expired air. When the concentrations and the
volumes are brought together in a series of equations, the
volumes of oxygen consumed per minute (VO2) and
carbon dioxide produced per minute (VCO2) are
determined. The ratio of VCO2/VO2 is the
Respiratory Exchange Ratio (RER), which can be used to determine
the proportions of energy being produced by carbohydrates and
fats.
In this experiment, students will measure the VO2 and
VCO2 of a subject while resting, hyperventilating,
recovering from hyperventilation, and recovering from light or
moderate exercise using an iWorx GA-200 CO2/O2
gas analyzer. The gas analyzer is connected to a spirometry
system designed for the quick and easy measurements of lung
volumes and gas concentrations from samples of expired air. The
RER for the various activity periods will be calculated from the
values for VCO2 and VO2. |
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Browsing Area
Download locked Respiratory
Exchange Ratio experiment.
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iWorx Users Area
(password required)
Download
screen optimized or
press optimized Respiratory
Exchange Ratio experiment. |
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The GA-200 Carbon Dioxide
and Oxygen Gas Analyzer
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The GA-200 is a gas analyzer that integrates the sampling
system with the sensors to create a compact, easy to use,
and affordable unit for measuring the concentrations of
oxygen and carbon dioxide. The GA-200 has a fluorescent
display for programming the unit and observing measurements,
a keypad for programming the unit’s operation and
calibration, and analog outputs that allow the unit to be
connected to data recording units like the iWorx 214.
The
GA-200 uses laser diode absorption technology and infrared
detection to measure the concentrations of oxygen and carbon
dioxide, respectively. These features give the GA-200 a
very fast response time that enables breath to breath
analysis of gas concentrations to be made, in addition to
measurements from mixing chambers. |
GA-200 Gas Analyzer
The GA-200 gas
analyzer is calibrated at the factory and is ready to take
measurements immediately. Just connect the source of the gas
sample to the gas analyzer with the proper connectors and
press the RUN key.
Learn
more about the GA-200 Carbon Dioxide and Oxygen Gas Analyzer
here. To
order, please go
here.
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Download the updated settings
file for this month's experiment with LabScribe2 Software. |
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If you plan to
use the Respiratory Exchange Ratio experiment in your course, iWorx
users can obtain a copy of the settings file used to
configure the LabScribe2 recording software to do this
experiment by clicking
here.
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 a 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.
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Web Resources |
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Learn more about respiratory exchange ratios
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.
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iWorx 2007/2008 Physiologist's Toolbook Now Available |
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iWorx 2007/2008 Physiology Solutions Catalog is now
available in print or for download in PDF format.
The new catalog
is a comprehensive resource for advanced, integrated
physiology teaching kits and a full range of systems and
components for physiology research. The catalog includes
many new products including LabScribe2 Data Acquisition and
Analysis Software, 300 Series Research Grade Recorders, and
a number of new components to augment your teaching
curriculum and speed your research.
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Request
your free copy today and see iWorx special
introductory offers below. |
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Special Introductory Offers Available
Until December 31, 2007 |
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In conjunction with the launch of the 2007/2008 catalog,
iWorx is offering a 20% discount on a wide range of
transducers and other products for physiology teaching and
research. See the full list of special offers
here and order before
December 31, 2007 to receive your 20% discount.
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