Abstract
This study measured the influence of the flavonoid quercetin on immune changes and
incidence rates of upper respiratory tract infections in ultramarathoners competing
in the 160-km Western States Endurance Run. Sixty-three runners were randomized to
quercetin and placebo groups, and under double-blinded methods ingested 1000 mg/day
quercetin for 3 wks before, during, and 2 wks after the race. Thirty-nine of the 63
subjects (n = 18 for quercetin, n = 21 for placebo) finished the race and provided
blood and saliva samples the morning before the race and 15 – 30 min postrace. Upper
respiratory tract infections were assessed during the week before and the 2-wk period
after the race using an illness symptom checklist. Race times did not differ significantly
between quercetin and placebo groups. Significant pre- to postrace decreases were
measured for natural killer cells (43 %), granulocyte respiratory burst activity (55 %),
and salivary IgA output (48 %), and increases for neutrophil (288 %) and monocyte
(211 %) cell counts, with no significant group differences. Postrace illness rates
did not differ between groups. In conclusion, quercetin supplementation for 3 wks
before and 2 wks after the Western States Endurance Run had no effect on illness rates,
perturbations in leukocyte subset counts, or decreases in granulocyte respiratory
burst activity and salivary IgA.
Key words
exercise - infections - antibodies - natural killer cells - IgA - respiratory burst
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Dr. Dru Henson
Appalachian State University Department of Biology
IG Greer 201, CAS
Boone, North Carolina 28608
United States
Telefon: + 1 82 82 62 30 78
Fax: + 1 82 82 62 48 91
eMail: hensonda@appstate.edu