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  • Quercetin (1000 mg/day) reduced upper respiratory tract infections 9-fold after intense exercise


    Posted by .(JavaScript must be enabled to view this email address)
    Monday, February 26, 2018 10:46 am Email this article

    Trained male cyclists who were given 1,000 mg of quercetin per day, before, during and after intense exercise—cycling for 3 hours per day for 3 days—experience 9-times fewer upper respiratory tract infections than cyclists who were given a placebo—1 out of 20 given quercetin versus 9 out of 20 given placebo (5% vs 45%)—according to a study from researchers at Appalachian State University in Boone, North Carolina, USA.

    (The cyclists averaged about 1.5 hours of cycling per day, so “the 3-[day] intensified exercise period (9 [hours] of exercise) represented nearly a doubling of their normal exercise workload” the paper noted.)

    “Quercetin versus placebo ingestion did not alter exercise-induced changes in several measures of immune function, but it significantly reduced [upper respiratory tract infections] incidence in cyclists during the 2-[week] period after intensified exercise,” the authors of the study concluded.

    Reference

    Nieman DC, Henson DA, Gross SJ, Jenkins DP, Davis JM, Murphy EA, Carmichael MD, Dumke CL, Utter AC, McAnulty SR, McAnulty LS, and Mayer EP. Quercetin reduces illness but not immune perturbations after intensive exercise. Med Sci Sports Exerc, 2007 Sep; 39(9): 1561-1569.

    Author’s Contact Info

    David C. Nieman, DrPH, FACSM
    Dept HLES, PO Box 32071
    Appalachian State University
    Boone, NC 28608 USA
    .(JavaScript must be enabled to view this email address)

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