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To investigate the effect of intense exercise on immunological factors in saliva, we measured secretory immunoglobulin A (sIgA), lactoferrin and fibronectin. We used a reliable saliva collection method that has already been reported. Timed saliva samples were obtained from 16 healthy young males. Samples were collected before, immediately after, 1 day after and 5 days after endurance running (42.195 km). The concentrations (ƒÊg/ml) of sIgA, lactoferrin and fibronectin were measured by ELISA, and the secretion rates (ƒÊg/min) of each were calculated. Immediately after the exercise, the concentration of total protein in saliva increased significantly, but the sIgA secretion rate decreased to 53%. The secretion rates of both lactoferrin and fibronectin did not change significantly. The local immune system plays an important role in mucosal surface defense against upper respiratory tract infection. The sIgA level in the oral cavity was temporarily decreased after intense exercise. A decreased sIgA secretion rate might partly explain the increased susceptibility to upper respiratory tract infection after endurance exercise. (Jpn. J. Phys. Fitness Sports Med. 1998, 47: 53•`62) key words: saliva, sIgA, lactoferrin, fibronectin, endurance running

ALTERATION OF LOCAL IMMUNITY IN THE ORAL CAVITY AFTER ENDURANCE RUNNING