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Total concentration of polyclonal antibodies (A) [IgA (B), IgM (C) and IgG (D)] specific for influenza vaccine in the groups of elderly non-practitioners (NP) and practitioners of combined-exercise training (CET), supplemented with L-glutamine or placebo. The concentrations were determined in serum samples obtained before (Pre) and after 30 days (Post) of vaccination and supplementation. Significance level of * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001.
