Effect of Eight Weeks of Quercetin Supplementation on Exercise Performance, Muscle Damage and Body Muscle in Male Badminton Players

Background: quercetin is a bioflavonoid which occurs in many fooditems. some previous studies on quercetin showed inconsistent resultson exercise performance, muscle damage and body muscle in athletes.the aim of this study was to determine the effects of eight weeks ofquercetin supplementation on exercise performance, muscle damageindices and body muscle in badminton players.methods: this placebo?controlled, double?blind clinical trial wasconducted on 26 badminton players for eight weeks. the subjects wererandomly assigned to one of two groups to receive quercetin (1000 mg)or placebo (1000 mg dextrose). vo2 and time to exhaustion (tte) formeasuring performance and body fat percentage (bfp) were measuredbefore and after intervention. plasma sample swere obtained for thedetermination of plasma lactate before and after intervention.results: lactate concentration, body fat percentage and vo2 maxdid not show any significant difference (p > 0/05) after eight weeksof supplementation with placebo and quercetin between two groupsand within one group. there was a significant increase in tte afterintervention in the quercetin group (p < 0/05) but a significant changewas not observed in the placebo group (p > 0/05).conclusions: the current study shows that intake of quercetin mayimprove endurance exercise performance but may not reduce the bodyfat percentage.