What term refers to the breakdown of collagen fibers when exposed to heat?

The correct term for the breakdown of collagen fibers when exposed to heat is commonly referred to as collagen shrinkage. When collagen is subjected to heat, the protein fibers begin to contract, leading to a reduction in their overall length and structure. This process is crucial in various aesthetic procedures, such as laser treatments or radiofrequency therapies, where heat is intentionally used to induce skin tightening.

Understanding collagen shrinkage is essential, as it highlights the effects of heat not just on the skin's appearance but also on its underlying structural integrity. The ability of collagen to respond to heat makes it a significant factor in many esthetic practices aimed at enhancing skin elasticity and reducing the signs of aging.