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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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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© 2005 CB Sciences, Inc. Patent pending. iWorx is a trademark of CB Sciences, Inc.

May 2006

  Experiment:  Lung Volumes and Heart Rate

Respiratory Sinus Arrhythmia (RSA), the cyclic change in heart rate that is driven by breathing, has been studied for centuries. During inhalation, the diaphragm contracts and moves downward to create a negative pressure in the thoracic cavity. This negative pressure pulls more blood into the major veins in the chest, which improves venous return to the heart and increases the amount of blood entering the right side of the heart. Since more blood is entering the heart, more blood needs to be pumped out of the heart. And, the solution for moving more blood is an increase in the heart rate. During exhalation, the diaphragm relaxes causing the pressure in the thoracic cavity to be less negative. As the result, the venous return decreases, less blood enters the heart, and the heart rate can decrease.

In this experiment, students will determine the effect of the inhalation volume on heart rate. The heart rates of subjects will be recorded while they are breathing normal tidal, sub-maximal, and maximal inhalations. Heart rates will also be recorded as subjects simulate deep breathing by moving the muscles involved in respiration without the exchange of air into and out of the lungs.

Download high resolution  press optimized or low resolution screen optimized Lung Volumes and Heart Rate Experiment (PDF file).

Tech Note:  Cleaning the A-FH-300 Flowhead

Whenever using a spirometer, each experimental subject should use a clean flowhead. To learn more about the correct cleaning procedure for the A-FH-300 flowhead, the standard flowhead included with the SP-304 spirometer, download this tech note.

A-FH-300 Flowhead

For a limited time, iWorx is offering a 30% discount on a 3 pack of the A-FH-300-3 Reusable Spirometer Flowheads for just $240 (list price $345) until June 30, 2006.  Customers in the U.S. and Canada can order directly online.

A-FH-300-3

Reusable 300L Spirometer Flowheads (3 pack)

$345

$240

  Users Area: Log-in or Register for Access to LabScribe
  Installers, Lab Manuals, and Settings Files.

Whether you plan to download any of the experiments announced in recent editions of the iWorx Newsletter or a new copy of the LabScribe Installation CD, you need a password and an ID to access the download sites for these items. 

To register for a new ID and password, please go here.   After you receive confirmation that user account has been activated, return to the same site and click on the Enter link. 

Registered users can log-in here.

To download screen or press optimized copies of the latest lab experiments and Tech Notes published in the iWorx Newsletters, go here and select the lab experiment of interest.

If you plan to use any of the experiments or manuals announced in recent editions of the iWorx Newsletter, you should obtain a copy of the settings group used to configure LabScribe for these experiments.  To download the settings file, right click here and choose "Save Target As" in the Internet Explorer browser or "Save Link As" in the Firefox browser.  Save the file in your LabScribe Folder.  When you launch LabScribe, the settings group will be available from Load Group command in the Settings menu.

Web Resources

Learn more about the Valsalva maneuver and hyperventilation and their effect on heart rate, and more on our 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 sub categories for easy reference.

We are pleased to announce the launch of our new e-commerce Web site for data acquisition and analysis solutions for the life sciences.  Please visit us at www.iworx.com.  Customers in the U.S. and Canada can now purchase many of our physiology teaching products and replacement components directly online.  See all special offers currently running.

Clearance Items

iWorx has a large supply of new and trade-in items at up to 70% discount.  Also check with us about trade in allowances for your older Powerlab or Biopac equipment.  Customers in the U.S. and Canada can order directly online. See specials