Which physiological effect is primarily associated with infrared light therapy?

The correct choice highlights that increased vasodilation is primarily associated with infrared light therapy. Infrared light operates at wavelengths that can penetrate the skin and tissue, resulting in the dilation of blood vessels. This increased blood flow enhances circulation, promoting oxygen and nutrient delivery to the affected areas, which can aid in healing and overall tissue recovery.

While decreased inflammation and improved muscle tension are also potential outcomes of infrared therapy, they are secondary effects that may result from the primary action of increased vasodilation. Improved circulation can lead to a reduction in inflammation as more immune cells reach the area and waste products are cleared more efficiently. Similarly, with better blood flow and improved nutrient supply to muscles, there can be an improvement in muscle tension. However, these outcomes stem from the initial physiological effect of vasodilation, making it the most direct and primary effect associated with this type of therapy.