Near-Infrared Interactance (NIR)

Near-Infrared Interactance (NIR) is a non-invasive technique used to estimate body composition, such as body fat and muscle mass. It works by directing near-infrared light into the skin, which penetrates tissues and interacts with components like water, fat, and protein. Sensors then measure how much light is reflected back, with different tissues absorbing and scattering light differently. Analyzing these reflections allows for calculating body composition quickly and safely, making NIR useful for health assessments, athletic monitoring, and nutritional studies.