In superficial heat therapy, skin and subcutaneous tissue temperature increases by approximately how many degrees Fahrenheit after about 6 minutes, and is maintained for up to 30 minutes?

• A. 25-30 F
• B. 41-42.8 F
• C. 50-60 F
• D. 70-80 F

Answer: (B)

Superficial heat therapy raises the temperature of skin and subcutaneous tissues to a moderate, therapeutic level within minutes. After about six minutes, the tissue temperature typically reaches roughly 105–109°F (about 41–43°C) and this elevated temperature can be maintained for up to 30 minutes as long as the heat is applied. From baseline skin temperature, that’s an increase of around 9°F. This level is high enough to promote vasodilation and increased metabolism in the tissues, improve tissue extensibility, and help with pain and stiffness, without risking damage from excessive heat.