# Exercise Ameliorates Immunosenescence: From Mechanisms to Interventions

## TL;DR

Regular exercise can improve immune function in older adults by reducing inflammation and enhancing immune cell performance.

## Contribution

This paper reviews how exercise mitigates immunosenescence through metabolic, cellular, and epigenetic mechanisms.

## Key findings

- Exercise improves immune communication and reduces chronic inflammation in aging.
- Physical activity activates autophagy and mitochondrial function in immune cells.
- Lifelong exercise is linked to slower progression of immunosenescence.

## Abstract

Aging is a natural process that affects many parts of our bodies, including the immune system, which helps protect us from diseases. As we age, our immune system gradually loses its strength. This results in weaker defenses against infections and a higher risk of illnesses related to aging, such as autoimmune diseases, cancer, heart disease, and Alzheimer’s disease. These health issues can affect our quality of life and how long we live. Researchers are exploring ways to slow down aging and maintain a strong immune system. Recent studies show that regular physical activity can significantly improve how well our immune system works. Exercise helps our bodies process nutrients better, encourages better communication between our organs and the immune system, and reduces inflammation that can come with aging. Additionally, being physically active can help aging immune cells function better by activating certain cell processes. It is important to note that different types and amounts of exercise can have varying effects on immune health. Overall, staying physically active throughout life can greatly enhance our immune system and help us age healthier.

Aging is an inevitable biological process that affects the function of various organs, including the immune system. Immunosenescence is characterized by diminished immune cell function, weakened immune responses, and imbalances in immune components, which together reduce the body’s resistance to pathogens and increase the risk of age-related diseases in older adults. These conditions pose direct threats to health and significantly impact quality of life and longevity. Therefore, effective strategies to delay aging and maintain immune function are critical areas of research. Emerging evidence suggests that moderate physical activity can significantly enhance immune system functionality, serving as an effective intervention for mitigating immunosenescence. Exercise is known to remodel the metabolism of carbohydrates, fats, and proteins, strengthen communication between organs and the immune system, regulate the functions of both innate and adaptive immune cells, and decrease age-related chronic inflammation. Furthermore, exercise aids in restoring the functionality of aging immune cells through mechanisms such as autophagy activation, mitochondrial optimization, and epigenetic reprogramming. Importantly, a dose–response relationship exists between various exercise modalities and the attenuation of immunosenescence in older adults, with the cumulative amount of lifelong physical activity profoundly influencing the pace of immunosenescence.