Which heating level is primarily used to increase viscoelastic properties by affecting collagen?

• A. Mild heating
• B. Moderate heating
• C. Vigorous heating
• D. No heating

Answer: (C)

Heating tissue raises its temperature, which makes collagen fibers more mobile and reduces viscosity. As collagen becomes warmer, the tissue can deform more under load and recover better afterward, meaning the viscoelastic properties improve. To achieve this safely, you target a moderate heating level—enough to bring tissue temperature to roughly 40-45°C. Mild heating (lower temperatures) often won’t change collagen extensibility much, while vigorous heating (above about 45°C) increases the risk of collagen denaturation and tissue damage. So the practical goal is a moderate increase that enhances collagen extensibility without crossing into danger.