How Swimming Modulates Inflammatory Pathways in Pain, Neurodegenerative, and Metabolic Disorders

Background: As a non-weight-bearing full-body exercise, swimming may reduce inflammation and boost anti-inflammatory agents to decrease the risk of cardiovascular, neurological, and rheumatological disorders. This systematic review examines the current evidence on the role of swimming exercise in modulating immune responses through inflammatory pathways. Methods: First, the PubMed and Scopus databases were searched through December 2024 for studies on swimming and inflammation. The initial search using keywords yielded 509 articles; 102 met the inclusion criteria after screening for relevance, language, and full-text availability. Results: This study suggests that regular swimming reduces neuroinflammation by enhancing BDNF, CREB, and PI3K/Akt signaling while suppressing both mRNA and protein levels of NF-κB, TNF-α, and IL-6 in the brain. In metabolic tissues, it activates SIRT1 and PGC-1α, improving mitochondrial biogenesis and antioxidant defense. Swimming also upregulates PPAR-α and eNOS while downregulating iNOS, leading to reduced vascular inflammation, oxidative stress, and fibrosis in renal and cardiac tissues. Moreover, the enhanced production of IL-10 and the decreasing levels of IL-1β and CRP contribute to systemic anti-inflammatory effects. Conclusions: Consequently, the available evidence suggests that swimming can be a low-impact, full-body exercise with potential therapeutic options in managing inflammation-related conditions such as cardiovascular disease, diabetes, and obesity. Future studies should focus on human clinical trials, investigate mechanisms, and assess longer time frames.