|Body Composition Lab|
1 - CNRC Research
2 - CNRC Research (cont.)
3 - CNRC Research (cont.)
Air Displacement Plethysmograph (BodPod)
The BodPod uses a technique called Air Displacement Plethysmography (ADP) to measure body volume , which in turn can be used to estimate percent body fat.
This technique relies on the physics of Boyle's Law, which states that pressure and volume vary inversely with one another. In other words, as pressure goes up, volume goes down, and vice versa . Monitoring pressure changes in a closed chamber allows one to calculate volume.
Bioelectrical impedance analysis (BIA)
Computed Tomography (CT) Scan
Computed tomography produce cross-sectional scans of the body, which is particularly useful in determining ratios of visceral (intra-abdominal) fat versus subcutaneous fat. CT is also used to obtain true three-dimensional bone mineral density (BMD in g/cm 3 ), usually of the lumbar spine. The BMD measurement looks specifically at trabecular bone - the softer, spongy bone within a vertebra that is most closely associated with bone loss in osteoporosis and other bone diseases.
This small, portable, optical device enables researchers to measure the thickness of subcutaneous adipose tissue at any location in the body in a rapid, safe and non-invasive manner.
Ultrasound measurements operate by emitting high frequency sound waves that penetrate the skin surface and pass through the fat layer, bounce off the muscle or bone, and return to the ultrasound unit. The time for the transmission of the ultrasound wave is recorded and converted to a body composition measurement based on comparative data. This portable technology can be used to estimate the bone density of individuals using localized measurements, such as of the tibia and radius, as well as to estimate subcutaneous fat.
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