Abstract
The diffusive reflectance intensity of skin in the near-infrared range is shown to be greatly influenced by its water content, similar to the way in which hemoglobin content affects the skin color in the visible range. The different behavior of water and hemoglobin at selected wavelengths might allow us to distinguish changes in fluid balance. The simplicity and high sensitivity of an optical method show a promising way of identifying a slight change in water content in soft tissue. The understanding of how the skin reflectance spectrum responds to the change in blood and water content will be the basis of a simplified multi-wavelength monitoring instrument.
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