| Autor: |
D C, Nieman, D A, Henson, C L, Dumke, R H, Lind, L R, Shooter, S J, Gross |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
The Journal of sports medicine and physical fitness. 46(1) |
| ISSN: |
0022-4707 |
| Popis: |
The relationship between salivary IgA secretion rate and upper respiratory tract infection (URTI) was studied in 155 ultramarathoners (126 males, 29 females, mean age 46.5+/-0.7 y) who had qualified to run the 160-km 2003 Western States Endurance Run.Subjects provided saliva samples during registration, held the morning before the race, and within 5-10 minutes postrace (mean race time, 26.2+/-0.3 h). Unstimulated saliva was collected by expectoration for 4 minutes into 15-mL plastic, sterilized vials. Runners finishing the race and providing pre- and postrace saliva samples (n=106) turned in a health log specifying URTI episodes and severity of symptoms for the 2-week period following the race.The total volume of saliva that the runners was able to expectorate during sample collection decreased 51% postrace compared to prerace values (P0.001). Saliva protein concentration increased 20% (P0.001) while the saliva protein IgA concentration decreased 10% (P0.05). Salivary IgA secretion rate decreased 46% when comparing pre- to postrace values (P0.001). Twenty-four percent of the runners finishing the race and providing salivary samples reported an URTI episode lasting 2 days or longer during the 2-week period following the race (mean number of days with symptoms was 5.4+/-0.6 days). The decrease in salivary IgA secretion rate (pre- to postrace) was 53% greater in the 25 runners reporting URTI (-355+/-45 microg/min) compared to the 81 runners not reporting URTI (-232+/-37 microg/min), (P=0.04).In summary, nearly 1 in 4 runners reported an URTI episode during the 2-week period following a 160-km race, and the decrease in salivary IgA secretion rate was significantly greater in these runners compared to those not reporting URTI. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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