title: Salivary immunoglobulin A responses in professional top-level futsal players.
abstract: The purpose of this study was to investigate the responses of salivary immunoglobulin A (SIgA) in 10 professional top-level Brazilian futsal players after 2 highly competitive games separated by 7 days. Unstimulated saliva was collected over a 5-minute period at PRE- and POST-match. The SIgA was measured by an enzyme-linked immunosorbent assay and expressed as the absolute concentration (SIgAabs) and secretion rate of IgA (SIgArate). Rate of perceived exertion and heart rate were used to monitor the exercise intensity. A 2-way analysis of variance with repeated measures showed nonsignificant differences between matches to SIgAabs, SIgArate, and saliva flow rate (p > 0.05). However, significant time differences were observed for all these parameters. In summary, we showed that a competitive training match induced a decrease in SIgA levels in top-level futsal players, which suggests an increment of the vulnerability to infections meditated by the training stimulus. This decrease suggests that the athletes were at an increased risk of developing an upper respiratory tract infection, and therefore, it could be necessary to take protective actions to minimize contact with cold viruses or even reduce the training load for athletes.
authors.affiliation: Department of Sport, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil. alemoreira@usp.br
authors.forename: Alexandre
authors.initials: A
authors.lastname: Moreira
authors.forename: Franco
authors.initials: F
authors.lastname: Arsati
authors.forename: Ynara Bosco
authors.initials: YB
authors.lastname: de Oliveira Lima-Arsati
authors.forename: Camila Gobo
authors.initials: CG
authors.lastname: de Freitas
authors.forename: Vera Cavalcanti
authors.initials: VC
authors.lastname: de Araújo
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D006339:Heart Rate; D006801:Humans; D018928:Immunity, Mucosal / Q000502:physiology; D007071:Immunoglobulin A, Secretory / Q000378:metabolism*; D008297:Male; D010465:Perception; D012463:Saliva / Q000276:immunology* / Q000378:metabolism; D012916:Soccer / Q000502:physiology*; D055815:Young Adult
chemical_list: D007071:Immunoglobulin A, Secretory