title: Divergent cytokine response following maximum progressive swimming in hot water.
abstract: Exercise promotes transitory alterations in cytokine secretion, and these changes are affected by exercise duration and intensity. Considering that exercise responses also are affected by environmental factors, the goal of the present study was to investigate the effect of water temperature on the cytokine response to maximum swimming. Swiss mice performed a maximum progressive swimming exercise at 31 or 38°C, and plasma cytokine levels were evaluated immediately or 1, 6 or 24 h after exercise. The cytokine profile after swimming at 31°C was characterized by increased interleukin (IL)-6 and monocyte chemotactic protein-1 (MCP-1) levels, which peaked 1 h after exercise, suggesting an adequate inflammatory milieu to induce muscle regeneration. Transitory reductions in IL-10 and IL-12 levels also were observed after swimming at 31°C. The cytokine response to swimming was modified when the water temperature was increased to 38°C. Although exercise at 38°C also led to IL-6 secretion, the peak in IL-6 production occurred 6 h after exercise, and IL-6 levels were significantly lower than those observed after maximum swimming at 31°C (p = 0·030). Furthermore, MCP-1 levels were lower and tumour necrosis factor-α levels were higher immediately after swimming at 38°C, suggesting a dysregulated pro-inflammatory milieu. These alterations in the cytokine profile can be attributed in part to reduced exercise total work because exhaustion occurred sooner in mice swimming at 38°C than in those swimming at 31°C.
authors: University Center of Belo Horizonte, Belo Horizonte, Minas Gerais, Brazil.
authors: Ana Carolina
authors: AC
authors: Campi-Azevedo
authors: Lorena Sabino
authors: LS
authors: Cleto
authors: Renata Sabino da
authors: RS
authors: Silva
authors: Junia de
authors: Jd
authors: Sousa-Franco
authors: José Carlos de
authors: JC
authors: Magalhães
authors: Claudia Lopes
authors: CL
authors: Penaforte
authors: Kelerson Mauro de
authors: KM
authors: Castro Pinto
authors: Etel
authors: E
authors: Rocha-Vieira
mesh_terms: D000818:Animals; D018932:Chemokine CCL2 / Q000097:blood / Q000378:metabolism; D005080:Exercise Test / Q000379:methods; D006359:Heat Exhaustion; D006358:Hot Temperature; D007249:Inflammation / Q000276:immunology; D016753:Interleukin-10 / Q000097:blood / Q000378:metabolism; D018664:Interleukin-12 / Q000097:blood / Q000378:metabolism; D015850:Interleukin-6 / Q000097:blood / Q000378:metabolism*; D008297:Male; D051379:Mice; D010805:Physical Conditioning, Animal / Q000502:physiology*; D013550:Swimming / Q000502:physiology*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood / Q000378:metabolism
chemical_list: C491768:Ccl2 protein, mouse; D018932:Chemokine CCL2; C556062:IL10 protein, mouse; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D018664:Interleukin-12