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Which body composition assessment technique is generally not considered valid according to best practices?

Hydrodensitometry

Air displacement plethysmography

Skin fold measurements

Doppler measurements

Doppler measurements are primarily used to assess blood flow and vascular health, rather than to evaluate body composition. Techniques such as hydrodensitometry, air displacement plethysmography, and skin fold measurements are all established methods for determining body fat percentage and overall body composition. Hydrodensitometry, for instance, relies on the principle of buoyancy to assess body density, while air displacement plethysmography utilizes changes in air pressure to measure body volume. Skin fold measurements gauge the thickness of subcutaneous fat at specific body sites to estimate body fat percentage. These methods have been validated through extensive research and are accepted as reliable ways to assess body composition. In contrast, Doppler measurements do not provide any direct information about the proportion of fat and lean mass in the body. Therefore, it is not a recognized or valid method for assessing body composition in individuals.

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