Which of the following best describes the preparatory goals of thermotherapy?

• A. To reduce tissue extensibility
• B. To increase pain and spasms
• C. To increase blood flow and tissue extensibility
• D. To decrease metabolic rate

Answer: (C)

Thermotherapy as a prep step is about warming the tissue to prepare it for activity. When heat is applied, blood flow to the area increases, bringing more oxygen and nutrients and helping remove waste products. The rise in temperature also makes tissues more pliable by reducing collagen stiffness, which increases tissue extensibility. With warmer, more compliant muscles and connective tissue, stretching or ROM exercises can be performed more effectively and with a lower risk of injury.

That’s why the best choice describes both increased blood flow and greater tissue extensibility. The other options describe effects that would hinder preparation: reduced extensibility would make stretching harder, increasing pain or spasms would defeat the purpose of warming up, and decreasing metabolic rate is not what heat does ( heat increases metabolic activity).