What is a thermal effect of ultrasound?

The thermal effect of ultrasound refers to the increase in temperature in the targeted tissues, which can subsequently enhance the extensibility of connective tissues, such as ligaments and tendons. This increase in temperature results from the absorption of ultrasound energy, leading to molecular vibrations and a rise in tissue temperature. As connective tissues become more pliable with higher temperatures, this facilitates stretching and reduces stiffness, making it easier to achieve greater range of motion and to perform therapeutic exercises.

In therapeutic contexts, increasing the extensibility of connective tissue can be especially beneficial for patients who are undergoing rehabilitation following injuries or surgeries. This effect can aid in the healing process by reducing pain and improving mobility.

On the other hand, other options focus on different effects of ultrasound that do not directly relate to thermal changes, such as nerve conduction velocity, blood flow alterations, and muscle tone, rather than emphasizing the specific outcome of increased tissue extensibility.