What is the temperature range associated with achieving residual length change during superficial heating?

What is the temperature range associated with achieving residual length change during superficial heating?

• A. 90–98
• B. 100–102
• C. 102–104
• D. 104–111.2

Answer: (D)

Achieving residual length change requires heating tissue to a higher temperature where connective tissue, especially collagen, becomes sufficiently pliable to elongate and maintain that length after cooling. When tissue temperature reaches about 40–44°C (roughly 104–111.2°F), collagen fibers soften and creep under a stretch, allowing a lasting increase in length. This is why the higher temperature range is the best choice—it provides the necessary change in tissue viscoelastic properties to produce a residual length change. Lower ranges warm the tissue and may improve comfort or transient extensibility, but they don’t produce the lasting length change seen at the higher temperatures.

Achieving residual length change requires heating tissue to a higher temperature where connective tissue, especially collagen, becomes sufficiently pliable to elongate and maintain that length after cooling. When tissue temperature reaches about 40–44°C (roughly 104–111.2°F), collagen fibers soften and creep under a stretch, allowing a lasting increase in length. This is why the higher temperature range is the best choice—it provides the necessary change in tissue viscoelastic properties to produce a residual length change. Lower ranges warm the tissue and may improve comfort or transient extensibility, but they don’t produce the lasting length change seen at the higher temperatures.