Int J Sports Med 2008; 29(10): 856-863
DOI: 10.1055/s-2007-989424
Immunology

© Georg Thieme Verlag KG Stuttgart · New York

Post-160-km Race Illness Rates and Decreases in Granulocyte Respiratory Burst and Salivary IgA Output are Not Countered by Quercetin Ingestion

D. Henson1 , D. Nieman2 , J. M. Davis3 , C. Dumke2 , S. Gross2 , A. Murphy3 , M. Carmichael3 , D. P. Jenkins1 , J. Quindry2 , S. McAnulty2 , L. McAnulty4 , A. Utter2 , E. Mayer3
  • 1Department of Biology, Appalachian State University, Boone, North Carolina, United States
  • 2Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, North Carolina, United States
  • 3Department of Exercise Science, University of South Carolina, Columbia, South Carolina, United States
  • 4Department of Family and Consumer Sciences, Appalachian State University, Boone, North Carolina, United States
Further Information

Publication History

accepted after revision November 15, 2007

Publication Date:
22 January 2008 (online)

Preview

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.

References

Dr. Dru Henson

Appalachian State University
Department of Biology

IG Greer 201, CAS

Boone, North Carolina 28608

United States

Phone: + 1 82 82 62 30 78

Fax: + 1 82 82 62 48 91

Email: hensonda@appstate.edu