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PURPOSE: The purpose of this study was to compare the reduction in salivary IgA in response to a 14 and 21 hour work shift. METHODS: Seventeen (15M, 2F) wildland firefighters (WLFF) from two Interagency Hotshot crews served as subjects. Subject groups were studied in response to a short or long work shift (13.9±0.7 and 21.4±0.3 hrs). Work shift energy expenditure (EE) was estimated using the method established by Heil (MSSE 33(5):s168, 2001). Unstimulated saliva (4 min) was collected prior to work at 0530 and immediately post shift. Salivary IgA secretion rate (mg.min-1) was calculated from an ELISA assay procedure. RESULTS: Work shift EE was significantly higher (p<0.05) for the long work shift (4101±578 and 3322±478 kcals for the long and short work shift, respectively).

CHANGES IN SALIVARY IGA DURING ARDUOUS WILDFIRE SUPPRESSION RELATIVE TO WORK SHIFT LENGTH