Regular moderate physical activity can prevent the neuroendocrine and detrimental immunological effects of stress.

While this paper does not specifically talk about tai chi, it is relevant to tai chi research since it suggests a mechanism by which tai chi, which is a moderate physical activity, could help reduce the detrimental effects of stress, which is widely reported among people who practice tai chi. Furthermore link between the neuroendocrine system and the immune system suggest that an exercise such as tai chi that promotes relaxation during exercise could be especially beneficial to the immune system.

Abstract