Which of the following is not a primary mechanism for muscle relaxation during massage?

The correct answer is related to the mechanisms that primarily contribute to muscle relaxation during massage therapy. The increase in blood flow helps deliver oxygen and nutrients to the muscles while also facilitating the removal of metabolic waste products, which supports recovery and relaxation. The decrease in muscle tension is directly addressed through various massage techniques that manipulate the muscle and soft tissue, promoting a state of relaxation. Additionally, the reduction of stress hormones is crucial because high levels of stress can lead to increased muscle tension and pain; therefore, massage can promote relaxation by lowering these hormones.

On the other hand, while T cells are involved in immune response and overall health, they are not directly related to the muscle relaxation process during massage. Their involvement is more about the immune system rather than the immediate physiological effects observed when someone receives a massage, such as the relaxation of muscle tissues and the alleviation of tension. Thus, the increase in T cells does not play a significant role in muscle relaxation compared to the other mechanisms listed.