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The principle of infrared interactance is based on differences in absorbance and reflection of infrared light in different tissues. When the absorbance of near-infrared light (700–1100 nm) is measured at well-defined sites of the body, information on the thickness of the subcutaneous adipose tissue layer can be obtained. In the prediction formulae used, many other parameters are included, such as weight, height, age, and gender, and it has been argued that the prediction of body fat depends more on these parameters than on the measured infrared interaction.
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