Are caffeine effects equivalent between different modes of administration: the acute effects of 3 mg.kg-1 caffeine on the muscular strength and power of male university Rugby Union players.

IF 4.5 2区 医学 Q1 NUTRITION & DIETETICS
Jason Tallis, Michael J Duncan, Neil D Clarke, Rhys O Morris, Ryan A Tamilio
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引用次数: 0

Abstract

Background: There is growing interest in the potential of alternative modes of caffeine administration for enhancing sports performance. Given that alternative modes may evoke improved physical performance via distinct mechanisms, effects may not be comparable and studies directly comparing the erogenicity of alternative modes of caffeine administration are lacking. To address this knowledge gap, the present study evaluated the effect of 3 mg·kg-1 caffeine delivered in anhydrous form via capsule ingestion, chewing gum or mouth rinsing on measures of muscular strength, power, and strength endurance in male Rugby Union players.

Methods: Twenty-seven participants completed the study (Mean ± SD: Age 20 ± 2 yrs; daily caffeine consumption 188 ± 88 mg). Following assessments and reassessment of chest press (CP), shoulder press (SP), Deadlift (DL), and Squat (SQ) 1-repetition maximum (1RM) and familiarization to the experimental procedures, participants completed six experimental trials where they were administered 3 mg.kg-1 caffeine (Caff) or placebo (Plac) capsule(CAP), chewing gum(GUM) or mouth rinse(RINSE) in a randomized, double-blind and counterbalanced fashion prior to force platform assessment of countermovement jump, drop jump and isometric mid-thigh pull performance. Strength endurance was measured across two sets of CP, SP, DL, and SQ at 70% 1RM until failure. Pre-exercise perceptions of motivation and arousal were also determined.

Results: Caffeine increased perceived readiness to invest mental effort (p = .038; ηp2=.156), countermovement jump height (p = .035; ηp2=.160) and SQ repetitions until failure in the first set (p < .001; d = .481), but there was no effect of delivery mode (p > .687; ηp2<.015). Readiness to invest physical effort, felt arousal, drop jump height, countermovement jump, drop jump and isometric mid-thigh pull ground reaction force-time characteristics and repetitions until failure in CP, SP and DL were not affected by caffeine administration or mode of caffeine delivery (p > .0.052; ηp2< .136).

Conclusion: 3 mg.kg-1 caffeine administered via capsule, gum or mouth rinse had limited effects on muscular strength, power, and strength endurance. Small effects of caffeine on CMJ height could not be explained by changes in specific ground reaction force-time characteristics and were not transferable to DJ performance, and effects specific to the SQ RTP exercise underpin the complexity in understanding effects of caffeine on muscular function. Novel modes of caffeine administration proposed to evoke benefits via distinct mechanisms did not offer unique effects, and the small number of effects demonstrated may have little translation to a single performance trial when data examining direct comparison of each caffeine vehicle compared against a mode matched placebo is considered.

不同给药方式对咖啡因的影响是否相同:3 毫克/千克咖啡因对大学橄榄球联盟男运动员肌肉力量和力量的急性影响。
背景:人们越来越关注咖啡因替代给药模式在提高运动表现方面的潜力。鉴于其他给药方式可能通过不同的机制唤起运动表现的提高,因此其效果可能不具有可比性,目前还缺乏直接比较其他咖啡因给药方式的致情性的研究。为了填补这一知识空白,本研究评估了通过服用胶囊、口香糖或漱口以无水形式给药的 3 mg-kg-1 咖啡因对男性橄榄球运动员肌肉力量、功率和力量耐力的影响:27 名参与者完成了研究(平均值± 标准差:年龄 20±2 岁;每日咖啡因摄入量 188±88 毫克)。在对胸前推举(CP)、肩部推举(SP)、举重(DL)和深蹲(SQ)的 1 次重复最大重量(1RM)进行评估和复测,并熟悉实验程序后,参与者完成了六次实验,在这些实验中,他们被施以 3 毫克。kg-1咖啡因(Caff)或安慰剂(Plac)胶囊(CAP)、口香糖(GUM)或漱口水(RINSE),采用随机、双盲和平衡的方式,然后在力量平台上评估反向运动跳跃、下落跳跃和等长大腿中部牵拉成绩。以 70% 的 1RM 进行两组 CP、SP、DL 和 SQ,直至失败,测量力量耐力。此外,还测定了运动前对动机和唤醒的感知:结论:通过胶囊、口香糖或漱口水给药的 3 毫克/千克咖啡因对肌肉力量、功率和力量耐力的影响有限。咖啡因对CMJ高度的微小影响无法用特定地面反应力-时间特征的变化来解释,也无法转移到DJ成绩上,而SQ RTP运动的特定影响则凸显了了解咖啡因对肌肉功能影响的复杂性。通过不同机制唤起益处的新咖啡因给药模式并没有提供独特的效果,如果考虑到将每种咖啡因载体与模式匹配的安慰剂进行直接比较的数据,所展示的少量效果可能无法转化为单一的成绩试验。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the International Society of Sports Nutrition
Journal of the International Society of Sports Nutrition NUTRITION & DIETETICS-SPORT SCIENCES
CiteScore
8.80
自引率
3.90%
发文量
34
审稿时长
6-12 weeks
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.
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