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Dietary Flavonoid Quercetin Increases VO2MAX and Endurance Capacity
J. Mark Davis, Catherine J. Carlstedt, Stephen Chen, Martin D. Carmichael, and E. Angela Murphy1
Quercetin, a natural polyphenolic flavonoid substance present in a variety of food plants, has been shown in vitro and in animal studies
to have widespread health and performance benefits resulting from a combination of biological properties, including antioxidant and
anti-inflammatory activity, as well as the ability to increase mitochondrial biogenesis. Little is known about these effects in humans,
however, especially with respect to exercise performance. The authors determined whether quercetin ingestion would enhance
maximal aerobic capacity and delay fatigue during prolonged exercise in healthy but untrained participants. Twelve volunteers were
randomly assigned to 1 of 2 treatments: (a) 500 mg of quercetin twice daily dissolved in vitamin-enriched Tang or (b) a
nondistinguishable placebo (Tang). Baseline VO2max and bike-ride times to fatigue were established. Treatments were administered for
a period of 7 days using a randomized, double-blind, placebo-controlled, crossover study design. After treatment both VO2max and
ride time to fatigue were determined. Seven days of quercetin feedings were associated with a modest increase in VO2max (3.9% vs.
placebo; p < .05) along with a substantial (13.2%) increase in ride time to fatigue (p <.05). These data suggest that as little as 7 days
of quercetin supplementation can increase endurance without exercise training in untrained participants. These benefits of quercetin
may have important implications for enhancement of athletic and military performance. This apparent increase in fitness without
exercise training may have implications beyond that of performance enhancement to health promotion and disease prevention.
1. The authors are with the Div. of Applied Physiology. Dept. of Exercise Science, Arnold School of Public Health, University of South
Carolina, Columbia, SC 29208 [AUQ1].
J. Mark Davis, Catherine J. Carlstedt, Stephen Chen, Martin D. Carmichael, and E. Angela Murphy1
Quercetin, a natural polyphenolic flavonoid substance present in a variety of food plants, has been shown in vitro and in animal studies
to have widespread health and performance benefits resulting from a combination of biological properties, including antioxidant and
anti-inflammatory activity, as well as the ability to increase mitochondrial biogenesis. Little is known about these effects in humans,
however, especially with respect to exercise performance. The authors determined whether quercetin ingestion would enhance
maximal aerobic capacity and delay fatigue during prolonged exercise in healthy but untrained participants. Twelve volunteers were
randomly assigned to 1 of 2 treatments: (a) 500 mg of quercetin twice daily dissolved in vitamin-enriched Tang or (b) a
nondistinguishable placebo (Tang). Baseline VO2max and bike-ride times to fatigue were established. Treatments were administered for
a period of 7 days using a randomized, double-blind, placebo-controlled, crossover study design. After treatment both VO2max and
ride time to fatigue were determined. Seven days of quercetin feedings were associated with a modest increase in VO2max (3.9% vs.
placebo; p < .05) along with a substantial (13.2%) increase in ride time to fatigue (p <.05). These data suggest that as little as 7 days
of quercetin supplementation can increase endurance without exercise training in untrained participants. These benefits of quercetin
may have important implications for enhancement of athletic and military performance. This apparent increase in fitness without
exercise training may have implications beyond that of performance enhancement to health promotion and disease prevention.
1. The authors are with the Div. of Applied Physiology. Dept. of Exercise Science, Arnold School of Public Health, University of South
Carolina, Columbia, SC 29208 [AUQ1].
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