Jennifer A Kurtz, Jacob Grazer, Kathryn Wilson, Rafaela G Feresin, J Andrew Doyle, Ryan Middleton, Emma Devis, Trisha A VanDusseldorp, Kimberly Fasczewski, Jeff Otis
{"title":"槲皮素和瓜氨酸对自行车计时赛成绩的影响","authors":"Jennifer A Kurtz, Jacob Grazer, Kathryn Wilson, Rafaela G Feresin, J Andrew Doyle, Ryan Middleton, Emma Devis, Trisha A VanDusseldorp, Kimberly Fasczewski, Jeff Otis","doi":"10.1080/15502783.2024.2416909","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>There is growing interest in the use of nutrition and dietary supplements to optimize training and time-trial (TT) performance in cyclists. Separately, quercetin (QCT) and citrulline (CIT) have been used as ergogenic aids to improve oxygen (VO<sub>2</sub>) kinetics, perceived effort, and cycling TT performance. However, whether the combination of QCT and CIT can provide additive benefits and further enhance cycling performance production is currently unknown.</p><p><strong>Methods: </strong>We examined 28-days of QCT + CIT supplementation on TT performance and several performance measures (i.e. mean power, VO<sub>2</sub>, respiratory exchange ratio (RER), and rate of perceived exertion (RPE)). Forty-eight highly trained cyclists were assigned to one of four supplementation groups: (1) QCT + CIT (QCT: 500 mg, CIT: 3000 g), (2) QCT (500 mg), (3) CIT (3000 mg), or (4) placebo (3500 mg of a zero-calorie flavored crystal light package). Supplements were consumed two times per day for 28 consecutive days. Participants performed a 20-km cycling time-trial race, pre- and post-supplementation to determine the impact of the combined effects of QCT + CIT.</p><p><strong>Results: </strong>There were no potential benefits of QCT +CIT supplementation on TT performance and several performance measures. However, there was an improvement in VO<sub>2</sub> from pre-to-post-supplementation in QCT (<i>p</i> = 0.05) and CIT (<i>p</i> = 0.04) groups, but not in the QCT+CIT and PL groups.</p><p><strong>Conclusions: </strong>QCT + CIT does not seem beneficial for 20-km TT performance; further exploration with a focus on an increase in cycling duration or QCT+CIT combined with additional polyphenols may amplify any perceived bioactive or metabolic effects on cycling performance. The efficacy of QCT + CIT supplementation to improve cycling performance remains ambiguous.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2416909"},"PeriodicalIF":4.5000,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11488173/pdf/","citationCount":"0","resultStr":"{\"title\":\"The effect of quercetin and citrulline on cycling time trial performance.\",\"authors\":\"Jennifer A Kurtz, Jacob Grazer, Kathryn Wilson, Rafaela G Feresin, J Andrew Doyle, Ryan Middleton, Emma Devis, Trisha A VanDusseldorp, Kimberly Fasczewski, Jeff Otis\",\"doi\":\"10.1080/15502783.2024.2416909\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>There is growing interest in the use of nutrition and dietary supplements to optimize training and time-trial (TT) performance in cyclists. Separately, quercetin (QCT) and citrulline (CIT) have been used as ergogenic aids to improve oxygen (VO<sub>2</sub>) kinetics, perceived effort, and cycling TT performance. However, whether the combination of QCT and CIT can provide additive benefits and further enhance cycling performance production is currently unknown.</p><p><strong>Methods: </strong>We examined 28-days of QCT + CIT supplementation on TT performance and several performance measures (i.e. mean power, VO<sub>2</sub>, respiratory exchange ratio (RER), and rate of perceived exertion (RPE)). Forty-eight highly trained cyclists were assigned to one of four supplementation groups: (1) QCT + CIT (QCT: 500 mg, CIT: 3000 g), (2) QCT (500 mg), (3) CIT (3000 mg), or (4) placebo (3500 mg of a zero-calorie flavored crystal light package). Supplements were consumed two times per day for 28 consecutive days. Participants performed a 20-km cycling time-trial race, pre- and post-supplementation to determine the impact of the combined effects of QCT + CIT.</p><p><strong>Results: </strong>There were no potential benefits of QCT +CIT supplementation on TT performance and several performance measures. However, there was an improvement in VO<sub>2</sub> from pre-to-post-supplementation in QCT (<i>p</i> = 0.05) and CIT (<i>p</i> = 0.04) groups, but not in the QCT+CIT and PL groups.</p><p><strong>Conclusions: </strong>QCT + CIT does not seem beneficial for 20-km TT performance; further exploration with a focus on an increase in cycling duration or QCT+CIT combined with additional polyphenols may amplify any perceived bioactive or metabolic effects on cycling performance. The efficacy of QCT + CIT supplementation to improve cycling performance remains ambiguous.</p>\",\"PeriodicalId\":17400,\"journal\":{\"name\":\"Journal of the International Society of Sports Nutrition\",\"volume\":\"21 1\",\"pages\":\"2416909\"},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2024-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11488173/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the International Society of Sports Nutrition\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1080/15502783.2024.2416909\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/10/17 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"NUTRITION & DIETETICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the International Society of Sports Nutrition","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1080/15502783.2024.2416909","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/10/17 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"NUTRITION & DIETETICS","Score":null,"Total":0}
The effect of quercetin and citrulline on cycling time trial performance.
Background: There is growing interest in the use of nutrition and dietary supplements to optimize training and time-trial (TT) performance in cyclists. Separately, quercetin (QCT) and citrulline (CIT) have been used as ergogenic aids to improve oxygen (VO2) kinetics, perceived effort, and cycling TT performance. However, whether the combination of QCT and CIT can provide additive benefits and further enhance cycling performance production is currently unknown.
Methods: We examined 28-days of QCT + CIT supplementation on TT performance and several performance measures (i.e. mean power, VO2, respiratory exchange ratio (RER), and rate of perceived exertion (RPE)). Forty-eight highly trained cyclists were assigned to one of four supplementation groups: (1) QCT + CIT (QCT: 500 mg, CIT: 3000 g), (2) QCT (500 mg), (3) CIT (3000 mg), or (4) placebo (3500 mg of a zero-calorie flavored crystal light package). Supplements were consumed two times per day for 28 consecutive days. Participants performed a 20-km cycling time-trial race, pre- and post-supplementation to determine the impact of the combined effects of QCT + CIT.
Results: There were no potential benefits of QCT +CIT supplementation on TT performance and several performance measures. However, there was an improvement in VO2 from pre-to-post-supplementation in QCT (p = 0.05) and CIT (p = 0.04) groups, but not in the QCT+CIT and PL groups.
Conclusions: QCT + CIT does not seem beneficial for 20-km TT performance; further exploration with a focus on an increase in cycling duration or QCT+CIT combined with additional polyphenols may amplify any perceived bioactive or metabolic effects on cycling performance. The efficacy of QCT + CIT supplementation to improve cycling performance remains ambiguous.
期刊介绍:
Journal of the International Society of Sports Nutrition (JISSN) focuses on the acute and chronic effects of sports nutrition and supplementation strategies on body composition, physical performance and metabolism. JISSN is aimed at researchers and sport enthusiasts focused on delivering knowledge on exercise and nutrition on health, disease, rehabilitation, training, and performance. The journal provides a platform on which readers can determine nutritional strategies that may enhance exercise and/or training adaptations leading to improved health and performance.