What is one of the effects of moderate intensity exercise on the immune system?

Moderate intensity exercise is well-documented for its positive effects on various aspects of health, including the immune system. One significant effect of moderate exercise is its ability to stimulate an increase in immunoglobulin A (IgA) levels. IgA plays an essential role in the immune response, particularly in mucosal areas such as the gastrointestinal tract, respiratory tract, and urogenital tract. By increasing IgA levels, moderate exercise enhances mucosal immunity, providing a defense against pathogens and potentially reducing the risk of infections.

This benefit is part of a broader pattern observed with regular moderate physical activity, which can lead to improved immune function compared to rest or high-intensity exercise, which may have the opposite effect, temporarily suppressing immune responses. The increase in IgA levels reflects a well-regulated immune response that can support overall health, especially in athletes and individuals engaged in regular physical activity.