Caffeinated Ice Slushy Enhances 1,200 kJ Cycle Time-Trial Performance in the Heat.

IF 3 3区 医学 Q2 NUTRITION & DIETETICS
Grant J Landers, Shannon Ward, Matthew Zimmermann
{"title":"Caffeinated Ice Slushy Enhances 1,200 kJ Cycle Time-Trial Performance in the Heat.","authors":"Grant J Landers, Shannon Ward, Matthew Zimmermann","doi":"10.1123/ijsnem.2024-0164","DOIUrl":null,"url":null,"abstract":"<p><p>This study aimed to assess the effects of caffeine ingestion incorporated into an ice slushy on cycling time-trial (CTT) performance in hot, humid conditions. Nine moderately trained recreational male cyclists or triathletes ingested 6.8 g/kg crushed ice with either 6% carbohydrate concentration only (CON) or 6% carbohydrate concentration and 3 mg/kg caffeine (CAF) consumed over a 30 min period prior to exercise in a single-blind, counterbalanced design. Postingestion, participants completed a CTT equating 1,200 kJ of work (∼40 km) in a climate-controlled chamber (33 °C and 60% relative humidity). Experimental sessions were separated by 7 days. During each CTT, rectal temperature, cycling time, heart rate, blood lactate, and ratings of perceived exertion and thermal sensation were measured at set intervals of work. The 1,200 kJ CTT was completed faster in CAF (4,716 ± 785 s) compared with CON (4,911 ±755 s) (p < .05); and split times were completed faster in CAF compared with CON from the 800 to 1,200 kJ timepoints of the CTT. Precooling lowered rectal temperature similarly in both CAF (-0.6 ± 0.2 °C) and CON (-0.6 ± 0.1 °C) (p > .05). No differences were observed between CAF and CON for heart rate, rating of perceived exertion, rating of perceived thermal sensation, or blood lactate across the measured time points (p > .05). Precooling with the combination of a carbohydrate-based ice slushy and caffeine resulted in improved CTT performance in hot conditions compared with a carbohydrate-based ice slushy alone. Therefore, the addition of caffeine to ice slushies might be considered by endurance athletes competing in the heat for enhanced performance gains.</p>","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"1-7"},"PeriodicalIF":3.0000,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International journal of sport nutrition and exercise metabolism","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1123/ijsnem.2024-0164","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"NUTRITION & DIETETICS","Score":null,"Total":0}
引用次数: 0

Abstract

This study aimed to assess the effects of caffeine ingestion incorporated into an ice slushy on cycling time-trial (CTT) performance in hot, humid conditions. Nine moderately trained recreational male cyclists or triathletes ingested 6.8 g/kg crushed ice with either 6% carbohydrate concentration only (CON) or 6% carbohydrate concentration and 3 mg/kg caffeine (CAF) consumed over a 30 min period prior to exercise in a single-blind, counterbalanced design. Postingestion, participants completed a CTT equating 1,200 kJ of work (∼40 km) in a climate-controlled chamber (33 °C and 60% relative humidity). Experimental sessions were separated by 7 days. During each CTT, rectal temperature, cycling time, heart rate, blood lactate, and ratings of perceived exertion and thermal sensation were measured at set intervals of work. The 1,200 kJ CTT was completed faster in CAF (4,716 ± 785 s) compared with CON (4,911 ±755 s) (p < .05); and split times were completed faster in CAF compared with CON from the 800 to 1,200 kJ timepoints of the CTT. Precooling lowered rectal temperature similarly in both CAF (-0.6 ± 0.2 °C) and CON (-0.6 ± 0.1 °C) (p > .05). No differences were observed between CAF and CON for heart rate, rating of perceived exertion, rating of perceived thermal sensation, or blood lactate across the measured time points (p > .05). Precooling with the combination of a carbohydrate-based ice slushy and caffeine resulted in improved CTT performance in hot conditions compared with a carbohydrate-based ice slushy alone. Therefore, the addition of caffeine to ice slushies might be considered by endurance athletes competing in the heat for enhanced performance gains.

含咖啡因的冰沙在高温下提高1200千焦循环计时赛的表现。
这项研究旨在评估在炎热潮湿的条件下,咖啡因摄入冰泥对自行车计时赛(CTT)表现的影响。在单盲、平衡设计中,9名受过中等训练的休闲男性自行车运动员或铁人三项运动员在运动前30分钟内摄入6.8 g/kg碎冰,其中含有6%碳水化合物浓度(CON)或6%碳水化合物浓度和3 mg/kg咖啡因(CAF)。注射后,参与者在气候控制的房间(33°C和60%相对湿度)中完成了相当于1,200 kJ工作(约40公里)的CTT。每组实验间隔7 d。在每次CTT中,在设定的工作间隔内测量直肠温度、循环时间、心率、血乳酸以及感知运动和热感觉的评分。CAF组1,200 kJ CTT完成时间(4,716±785 s)比CON组(4,911±755 s)快(p < 0.05);在CTT的800 - 1200 kJ时间点上,CAF比CON完成得更快。预冷降低CAF(-0.6±0.2°C)和CON(-0.6±0.1°C)的直肠温度相似(p < 0.05)。在测量时间点上,CAF组和CON组在心率、感知运动评分、感知热感觉评分或血乳酸水平上没有差异(p < 0.05)。与单独的碳水化合物冰沙相比,碳水化合物冰沙和咖啡因的组合预冷可以改善CTT在高温条件下的表现。因此,在冰沙中添加咖啡因可能会被耐力运动员考虑在高温下比赛以提高成绩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
5.00
自引率
8.00%
发文量
50
审稿时长
6-12 weeks
期刊介绍: The International Journal of Sport Nutrition and Exercise Metabolism (IJSNEM) publishes original scientific investigations and scholarly reviews offering new insights into sport nutrition and exercise metabolism, as well as articles focusing on the application of the principles of biochemistry, physiology, and nutrition to sport and exercise. The journal also offers editorials, digests of related articles from other fields, research notes, and reviews of books, videos, and other media releases. To subscribe to either the print or e-version of IJSNEM, press the Subscribe or Renew button at the top of your screen.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信