What temperature rise defines vigorous heating?

• A. 0-1 deg C
• B. 2-3 deg C
• C. >=4 deg C
• D. 5-6 deg C

Answer: (C)

Vigorous heating means a substantial rise in tissue temperature, typically four degrees Celsius or more. This level of heating produces noticeable physiological effects, such as increased metabolic activity, greater blood flow, and improved tissue extensibility, which is why it’s used when a stronger heating response is desired. It also carries a higher risk of overheating and burns, so clinicians must monitor the temp rise and adjust duration or intensity accordingly.

Rises of 0-1°C are considered mild heating with minimal physiological effect, 2-3°C are moderate with some effect, and a rise like 5-6°C would exceed the typical vigorous range and increase safety concerns.