Intrasession Caffeine Intake and Cycling Performance After Accumulated Work: A Field-Based Study.

IF 3 3区 医学 Q2 NUTRITION & DIETETICS International journal of sport nutrition and exercise metabolism Pub Date : 2024-09-26 DOI:10.1123/ijsnem.2024-0109
Iván R Sánchez-Redondo, Lidia B Alejo, Carlos Revuelta, Raúl de Pablos, María Ibañez, Alberto Pérez-López, Alejandro Lucia, David Barranco-Gil, Pedro L Valenzuela
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Abstract

Background: Preexercise caffeine intake has proven to exert ergogenic effects on cycling performance. However, whether these benefits are also observed under fatigue conditions remains largely unexplored. We aimed to assess the effect of caffeine ingested during prolonged cycling on subsequent time-trial performance in trained cyclists.

Methods: The study followed a triple-blinded, randomized, placebo-controlled cross-over design. Eleven well-trained junior cyclists (17 ± 1 years) performed a field-based 8-min time trial under "fresh" conditions (i.e., after their usual warm-up) or after two work-matched steady-state cycling sessions (total energy expenditure∼20 kJ/kg and ∼100 min duration). During the latter sessions, participants consumed caffeine (3 mg/kg) or a placebo ∼60 min before the time trial. We assessed power output, heart rate, and rating of perceived exertion during the time trial and mood state (Brunel Mood Scale) before and after each session.

Results: No significant condition effect was found for the mean power output attained during the time trial (365 ± 25, 369 ± 31, and 364 32 W for "fresh," caffeine, and placebo condition, respectively; p = .669). Similar results were found for the mean heart rate (p = .100) and rating of perceived exertion (p = 1.000) during the time trial and for the different mood domains (all p > .1).

Conclusions: Caffeine intake during prolonged exercise seems to exert no ergogenic effects on subsequent time-trial performance in junior cyclists. Future studies should determine whether significant effects can be found with larger caffeine doses or after greater fatigue levels.

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会期咖啡因摄入量与累积工作后的自行车运动表现:基于现场的研究。
背景:运动前摄入咖啡因已被证明对自行车运动表现有促进作用。然而,在疲劳条件下是否也能观察到这些益处,这一点在很大程度上仍未得到探讨。我们的目的是评估在长时间骑车过程中摄入咖啡因对训练有素的自行车运动员随后的计时赛成绩的影响:研究采用三盲、随机、安慰剂对照交叉设计。11 名训练有素的青少年自行车运动员(17 ± 1 岁)在 "新鲜 "条件下(即通常的热身之后)或两次与工作相匹配的稳态自行车训练(总能量消耗∼20 kJ/kg,持续时间∼100 分钟)之后,进行了现场 8 分钟计时赛。在后一个环节中,参与者在计时赛前 60 分钟摄入咖啡因(3 毫克/千克)或安慰剂。我们评估了计时赛期间的功率输出、心率和感知用力等级,以及每次训练前后的情绪状态(布鲁内尔情绪量表):结果:计时赛期间的平均输出功率没有发现明显的条件效应("新鲜"、咖啡因和安慰剂条件分别为 365 ± 25 W、369 ± 31 W 和 364 32 W;P = .669)。计时赛期间的平均心率(p = .100)和感知用力值(p = 1.000)以及不同的情绪领域(所有 p > .1)也发现了类似的结果:结论:在长时间运动中摄入咖啡因似乎不会对青少年自行车运动员随后的计时赛成绩产生影响。未来的研究应确定咖啡因剂量越大或疲劳程度越高是否会产生明显影响。
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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.
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