title: Quercetin supplementation does not attenuate exercise performance and body composition in young female swimmers.
abstract: BACKGROUND
  Quercetin is a health-enhancing antioxidant bioflavonoid (1-3). This flavonoid occurs in variety of natural fruits and vegetables such as apple, cranberry, onion, broccoli, and teas. Many studies have shown that quercetin has possible positive effects on exercise performance. The aim of this study is the evaluation of effects of quercetin supplementation on VO2max and exercise performance in female athletes.
  
  
  METHODS
  This study was done on 26 young female swimmers. Participants were assigned in to groups and supplemented orally for 8 weeks with either Quercetin (Solaray(®), USA, Inc) or placebo (dextrose). Before and after intervention, athletes performed a continuous graded exercise test (GXT) on an electronically braked cycle ergometer (Lode, The Netherlands) to determine VO2max and time to exhaustion (TTE).
  
  
  RESULTS
  Participants in the quercetin group consumed higher energy and protein and lower carbohydrates and fats. There was no significant differences in VO2max, TTE, lactate, and body fat between pre- and post-supplementation neither in the placebo group nor in the quercetin group.
  
  
  CONCLUSIONS
  It is concluded that quercetin supplementation (1000 g/day) for 8 weeks in female athletes didn't show any significant association with exercise performance.
authors.affiliation: Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran ; Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Darvishi
authors.forename: Reza
authors.initials: R
authors.lastname: Ghiasvand
authors.forename: Mitra
authors.initials: M
authors.lastname: Hariri
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Askari
authors.forename: Pejman
authors.initials: P
authors.lastname: Rezai
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Aghaie
authors.forename: Bijan
authors.initials: B
authors.lastname: Iraj
authors.forename: Hossein
authors.initials: H
authors.lastname: Khosravi-Boroujeni
authors.forename: Nafiseh Shokri
authors.initials: NS
authors.lastname: Mashhadi
keywords: Performance; quercetin; swimmers