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FINAL Exam for Sports Nutrition

Terms in this set (48)

Hydrostatic weighing - based on Archimedes' principle - a body immersed in fluid is acted upon by a buoyancy force that is directly related to the volume of water displaced. Because fat is less dense and bone and muscle are more dense than water, a given weight of fat will displace a larger volume of water and exert a greater buoyant effect than bone and muscle. Body density is converted to estimated body fat percentage using an equation.
Air displacement plethysmography (ADP, Bod Pod) measures air displacement similar to underwater body weighing.
Skinfolds measure the thickness of subcutaneous fat (in mm) at specific anatomic sites. Use appropriate equation to estimate body density which is then plugged in to another equation for body fat percentage.
Bioelectric impedance analysis (BIA) is based on resistance to an electric current. Lower resistance seen with higher water content, higher body density, and lower body fat. Equations typically include gender, age; may include ethnicity, activity level.
Dual Energy X-ray Absorptimetry (DEXA) is based on ratios of attenuated high energy and low energy X-ray beams passing through dense (bone) and soft (fat) tissue.
Near-Infrared Interactance - infrared light passes through tissues; its interaction with tissue components is used to predict body fat.
Anthropometry - measure circumference of neck, abdomen, hips, buttocks, thigh (other body parts) and bone diameters of the hip, shoulders, elbow and wrist. Plug values into an equation to predict lean body mass and fat mass.
Total body water (TBW) easures total body water by isotope dilution to predict lean body mass and body fat.