Infrared radiation is described as applying superficial heat to improve what?

• A. Circulation
• B. Bone density
• C. Nerve conduction speed
• D. Deep muscle tissue heating

Answer: (A)

Infrared energy is absorbed mainly by superficial tissues, warming the skin and just beneath it. This warming causes the small surface blood vessels to dilate, increasing local blood flow. That boost in circulation brings more oxygen and nutrients to the area and helps remove waste products, supporting healing and reducing stiffness or pain. Because the heating is mainly superficial, infrared isn’t used to heat deep muscle tissue or to alter bone density, and while temperature can influence nerve conduction, the primary aim of infrared therapy is to improve circulation through superficial heating.