What is a primary symptom of muscle stiffness after exercise?

After exercise, a primary symptom of muscle stiffness is fluid collection in the muscle. This phenomenon, often referred to as delayed onset muscle soreness (DOMS), occurs as a result of microscopic tears in the muscle fibers during intense physical activity. These tears lead to an inflammatory response, causing fluid to accumulate in the affected muscles. This accumulation of fluid, along with other biochemical changes, contributes to the sensation of stiffness and discomfort.

Increased muscle soreness and the sensation of stiffness experienced following strenuous exercise can be attributed to this fluid buildup as it can create pressure within the muscle and surrounding tissues. This pressure can limit the range of motion and contribute to the feeling of tightness in the muscles, all characteristic of muscle stiffness after exertion.