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Near Infrared Interactance (NIR)

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By Rockwell Fitness


Definition

 This method is based on the principles of light absorption, reflectance, and near infrared spectroscopy.


Equipment Used

  • Computerized spectrophotometer
  • Digital scanner
  • Probe

How it Works

 An infrared light is emitted onto an anatomical site, most commonly the biceps. The light passes through both fat and muscle and is reflected back. The beam is then analyzed and data is entered into a formula to produce a body fat percentage (BF%).


Disadvantages

 

Advantages

  • Safe
  • Non-invasive
  • Cheap
  • Fast

 

Accuracy

 Plus or Minus 4% based on the Underwater Weighing method.

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