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Effects of Regular Physical Activity on the Immune System, Vaccination and Risk of Community-Acquired Infectious Disease in the General Population: Systematic Review and Meta-Analysis

Authors

Sebastien F. M. Chastin

Ukachukwu Abaraogu

Jan G. Bourgois

Philippa M. Dall

Jennifer Darnborough

Elaine Duncan

Jasmien Dumortier

Joanna McParland

Mark Hamer



Abstract

Background
Regular physical activity is the prime modality for the prevention of numerous non-communicable diseases and has also been advocated for resilience against COVID-19 and other infectious diseases. However, there is currently no systematic and quantitative evidence synthesis of the association between physical activity and the strength of the immune system.

Objective
To examine the association between habitual physical activity and (1) the risk of community-acquired infectious disease, (2) laboratory‚Äźassessed immune parameters, and (3) immune response to vaccination.

Methods
We conducted a systemic review and meta-analysis according to PRISMA guidelines. We searched seven databases (MEDLINE, Embase, Cochrane CENTRAL, Web of Science, CINAHL, PsycINFO, and SportDiscus) up to April 2020 for randomised controlled trials and prospective observational studies were included if they compared groups of adults with different levels of physical activity and reported immune system cell count, the concentration of antibody, risk of clinically diagnosed infections, risk of hospitalisation and mortality due to infectious disease. Studies involving elite athletes were excluded. The quality of the selected studies was critically examined following the Cochrane guidelines using ROB2 and ROBINS_E. Data were pooled using an inverse variance random-effects model.

Results
Higher level of habitual physical activity is associated with a 31% risk reduction (hazard ratio 0.69, 95% CI 0.61–0.78, 6 studies, N = 557,487 individuals) of community-acquired infectious disease and 37% risk reduction (hazard ratio 0.64, 95% CI 0.59–0.70, 4 studies, N = 422,813 individuals) of infectious disease mortality. Physical activity interventions resulted in increased CD4 cell counts (32 cells/µL, 95% CI 7–56 cells/µL, 24 studies, N = 1112 individuals) and salivary immunoglobulin IgA concentration (standardised mean difference 0.756, 95% CI 0.146–1.365, 7 studies, N = 435 individuals) and decreased neutrophil counts (704 cells/µL, 95% CI 68–1340, 6 studies, N = 704 individuals) compared to controls. Antibody concentration after vaccination is higher with an adjunct physical activity programme (standardised mean difference 0.142, 95% CI 0.021–0.262, 6 studies, N = 497 individuals).

Conclusion
Regular, moderate to vigorous physical activity is associated with reduced risk of community-acquired infectious diseases and infectious disease mortality, enhances the first line of defence of the immune system, and increases the potency of vaccination.

Citation

Chastin, S. F. M., Abaraogu, U., Bourgois, J. G., Dall, P. M., Darnborough, J., Duncan, E., …Hamer, M. (2021). Effects of Regular Physical Activity on the Immune System, Vaccination and Risk of Community-Acquired Infectious Disease in the General Population: Systematic Review and Meta-Analysis. Sports Medicine, 51(8), 1673-1686. https://doi.org/10.1007/s40279-021-01466-1

Journal Article Type Article
Acceptance Date Mar 31, 2021
Online Publication Date Apr 20, 2021
Publication Date 2021-08
Deposit Date Aug 30, 2022
Publicly Available Date Sep 1, 2022
Journal Sports Medicine
Print ISSN 0112-1642
Electronic ISSN 1179-2035
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 51
Issue 8
Pages 1673-1686
DOI https://doi.org/10.1007/s40279-021-01466-1
Public URL http://researchrepository.napier.ac.uk/Output/2899155

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