Vigorous thermal heating should be used for which response?

• A. Collagen elongation
• B. Decrease blood flow
• C. Acute edema
• D. Nerve regeneration

Answer: (A)

The main idea is that vigorous thermal heating raises tissue temperature enough to make collagenous tissues more extensible. Heat loosens the collagen fibers, lowers tissue viscosity, and allows the fibers to slide past each other more easily. When you then apply a stretch or lengthening maneuver, the tissues can elongate more effectively. That’s why vigorous heating is used to facilitate collagen elongation in tendons, ligaments, and other collagen-rich structures.

Keep in mind heat increases blood flow via vasodilation, so it wouldn’t be used to decrease circulation. In the acute stage, heat can worsen edema, so cold or other edema-control measures are preferred there. For nerve regeneration, heat isn’t the primary restorative tool.