Which modes of heat transfer are used in thermotherapy?

• A. Radiation only
• B. Conduction only
• C. Convection only
• D. Radiation, Conduction, and Convection

Answer: (D)

In thermotherapy, heat can be delivered to tissues through all three main modes of heat transfer: radiation, conduction, and convection. Radiant heat travels through space from a warmer source to the body without touching it, as with infrared lamps. Conduction occurs when heat moves from a warmer surface into the body through direct contact, like hot packs or paraffin. Convection uses a moving fluid or air to transfer heat, such as warm water in hydrotherapy or heated air in some wraps. Because thermotherapy devices and procedures utilize one or more of these mechanisms, the comprehensive option is all three modes. The other choices isolate just one mode, but thermotherapy as a category encompasses radiation, conduction, and convection.