Monday, 17 Jun 2024

Whole-Body Air-Displacement Plethysmography

Whole-Body Air-Displacement Plethysmography is a method used to assess body fat and lean mass. Unlike underwater weighing, it utilizes air displacement technology instead of water. This method commonly employs the BodPod machine to measure and track body composition.

Purpose

The purpose of Whole-Body Air-Displacement Plethysmography is to accurately measure and monitor body fat and lean mass using air displacement technology.

Equipment Required

To perform this test, a BodPod by Life Measurements Instruments in Concord, CA is required.

Pre-Test

Before conducting the test, it is crucial to explain the procedures to the subject, conduct a health risk screening, and obtain informed consent. Basic information such as age, height, body weight, gender, and test conditions should be recorded. The equipment must be checked and calibrated before proceeding. More details about the pre-test procedures can be found in the respective documentation.

Procedure

The Bod Pod system determines body composition by measuring body volume and weight. The subject should not have exercised in the two hours prior to the test to ensure accurate results. Body weight is measured using scales, while body volume is measured by comparing the volume of the chamber when empty to the volume of the chamber with the subject inside. By subtracting the volume of the empty chamber from the volume of the subject chamber, the subject’s body volume can be determined. Body density is then calculated using an equation to provide percent fat measurements.

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Method

Body volume is determined by monitoring pressure changes within a closed chamber. This is achieved by oscillating a speaker between the front testing chamber and a rear reference chamber, creating pressure changes in each chamber. Although these pressure changes are very small, they are not noticeable to the individual being tested.

Advantages

Whole-Body Air-Displacement Plethysmography offers a high level of accuracy, ease-of-use, and fast testing time. Unlike underwater weighing, it does not require the individual to get wet, making it suitable for special populations such as children, obese individuals, elderly individuals, and disabled persons.

Disadvantages

One major disadvantage of this method is the high cost of the BodPod unit, ranging from $30,000 to $40,000. Additionally, it is only available in a few facilities. Some research or academic institutions may offer this test for a fee.

Accuracy

Manufacturers state that the general error range of the Bod Pod is 1-2%, which is comparable to hydrostatic weighing.

References

  • Dempster P, Aitkens S: A new air displacement method for the determination of human body composition. Med Sci Sports Exerc 1995, 27:1692-1697.
  • McCrory MA, Gomez TD, Bernauer EM, Molé PA: Evaluation of a new air displacement plethysmograph for measuring human body composition. Med Sci Sports Exerc 1995, 27:1686-1691.
  • Fields DA, Goran MI, McCrory MA: Body-composition assessment via air-displacement plethysmography in adults and children: a review. Am J Clin Nutr 2002, 75:453-467.

Q: How does Whole-Body Air-Displacement Plethysmography work?
A: Whole-Body Air-Displacement Plethysmography works by measuring changes in pressure within a closed chamber, using air instead of water to determine body composition.

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Q: What equipment is required for Whole-Body Air-Displacement Plethysmography?
A: To conduct this test, a BodPod by Life Measurements Instruments in Concord, CA is needed.

Q: Who can benefit from Whole-Body Air-Displacement Plethysmography?
A: Whole-Body Air-Displacement Plethysmography is suitable for various populations, including children, obese individuals, elderly individuals, and disabled persons.

Whole-Body Air-Displacement Plethysmography is a method used to assess body fat and lean mass. By utilizing air displacement technology, this test provides accurate measurements and tracking of body composition. The BodPod machine is commonly used for this purpose. The procedure involves measuring body volume and weight, with the results used to calculate body density and percent fat. This method offers advantages such as accuracy, ease-of-use, and suitability for special populations. However, it comes with the disadvantage of high cost and limited availability. In conclusion, Whole-Body Air-Displacement Plethysmography is a reliable and efficient way to assess body composition. For more information, visit the Auralpressure website.