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Monocyte and T-cell responses to exercise training in elderly subjects
Kazuhiro Shimizu1, Natsumi Suzuki, Tomoko Imai
1Faculty of Sport Sciences, Waseda University, Saitama, Japan. shimikazu@aoni.waseda.jp
Exercise training in older adults boosts immune function by increasing T-cell and monocyte activity. This study shows significant increases in CD8 T-cells and CD80 monocytes after 12 weeks of exercise.
Area of Science:
- Immunology
- Gerontology
- Exercise Physiology
Background:
- Age-related decline in immune function, particularly T-cell activation, is a significant concern in elderly individuals.
- Impaired immune responses in older adults can lead to increased susceptibility to infections and reduced vaccine efficacy.
Purpose of the Study:
- To investigate the impact of a 12-week exercise training program on immune parameters in elderly individuals.
- To assess changes in T-cell subsets and monocyte markers associated with immune activation.
Main Methods:
- A randomized controlled trial involving 24 elderly subjects divided into an exercise training group (EXC) and a non-exercise control group (CON).
- The EXC group underwent 12 weeks of combined stretching, endurance, and resistance training.
- Blood samples were analyzed pre- and post-intervention for leukocyte, lymphocyte, monocyte counts, and specific cell surface markers (CD3, CD4, CD8, CD28, TLR-4, CD80).
Main Results:
- Exercise training led to a significant increase in CD28-expressing CD8+ T-cells (cytotoxic T-cells) in the EXC group.
- The EXC group also showed a significant increase in CD80-expressing monocytes after the training period.
- No significant changes were observed in overall leukocyte, lymphocyte, monocyte counts, or other T-cell markers in either group.
Conclusions:
- Exercise training in elderly individuals is associated with enhanced T-cell and monocyte-mediated immunity.
- These findings suggest that regular physical activity may help to counteract age-related immune deficiencies in older adults.
- Exercise interventions could be a valuable strategy for improving immune health in the aging population.
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