Caffeine, but not paracetamol (acetaminophen), enhances muscular endurance, strength, and power.

IF 4.5 2区 医学 Q1 NUTRITION & DIETETICS
Bela Scapec, Jozo Grgic, Dorian Varovic, Pavle Mikulic
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引用次数: 0

Abstract

Background: Caffeine is one of the most popular ergogenic aids consumed by athletes. Caffeine's ergogenic effect has been generally explained by its ability to bind to adenosine receptors, thus modulating pain and reducing perceived exertion. Another pharmacological agent that may improve performance due to its analgesic proprieties is paracetamol. This study aimed to explore the effects of caffeine, paracetamol, and caffeine + paracetamol consumption on muscular endurance, strength, power, anaerobic endurance, and jumping performance.

Methods: In this randomized, crossover, double-blind study, 29 resistance-trained participants (11 men and 18 women) ingested either a placebo, caffeine (3 mg/kg), paracetamol (1500 mg) or caffeine + paracetamol 45 min before the testing sessions. The testing sessions included performing the bench press exercise with 75% of one-repetition maximum to momentary muscular failure, isokinetic knee extension and flexion at angular velocities of 60°/sec and 180°/sec, Wingate, and countermovement jump (CMJ) tests.

Results: Compared to placebo, isolated caffeine ingestion increased the number of repetitions performed in the bench press (p = 0.005; d = 0.42). Compared to placebo, isolated caffeine ingestion and/or caffeine + paracetamol consumption was ergogenic for strength (torque), muscular endurance (total work), or power in the isokinetic assessment, particularly at slower angular velocities (p = 0.027 to 0.002; d = 0.16 to 0.26). No significant differences between the conditions were observed for outcomes related to the Wingate and CMJ tests.

Conclusion: This study provided novel evidence into the effectiveness of caffeine, paracetamol, and their combination on exercise performance. We found improvements in muscular endurance, strength, or power only when caffeine was consumed in isolation, or in combination with paracetamol. Isolated paracetamol consumption did not improve performance for any of the analyzed outcomes, thus calling into question its ergogenic potential.

咖啡因能增强肌肉耐力、力量和能量,对乙酰氨基酚(对乙酰氨基酚)则不然。
背景:咖啡因是运动员最常用的生力辅助剂之一。咖啡因的生力作用一般被解释为它能与腺苷受体结合,从而调节疼痛和减少感觉到的消耗。扑热息痛是另一种可通过镇痛作用提高运动成绩的药剂。本研究旨在探讨服用咖啡因、扑热息痛和咖啡因+扑热息痛对肌肉耐力、力量、功率、无氧耐力和跳跃成绩的影响:在这项随机、交叉、双盲研究中,29 名阻力训练参与者(11 名男性和 18 名女性)在测试前 45 分钟分别摄入安慰剂、咖啡因(3 毫克/千克)、扑热息痛(1500 毫克)或咖啡因 + 扑热息痛。测试内容包括以单次最大值的 75% 进行卧推运动至肌肉瞬间衰竭、以 60°/sec 和 180°/sec 的角速度进行等速膝关节伸屈运动、 Wingate 和反向运动跳跃(CMJ)测试:与安慰剂相比,摄入孤立咖啡因增加了卧推的重复次数(p = 0.005; d = 0.42)。与安慰剂相比,摄入单独的咖啡因和/或咖啡因+扑热息痛对等速运动评估中的力量(扭矩)、肌肉耐力(总功)或功率有促进作用,尤其是在较慢的角速度下(p = 0.027 至 0.002;d = 0.16 至 0.26)。在 Wingate 和 CMJ 测试结果方面,没有观察到不同条件下的明显差异:这项研究为咖啡因、扑热息痛及其组合对运动表现的影响提供了新的证据。我们发现,只有在单独摄入咖啡因或与扑热息痛同时摄入咖啡因时,肌肉耐力、力量或功率才会有所提高。单独服用扑热息痛并不能改善任何一项分析结果的表现,因此我们对扑热息痛的健身潜力提出了质疑。
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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