Juan Jesús Montalvo-Alonso, Marta Del Val-Manzano, Ester Cerezo-Telléz, Carmen Ferragut, David Valadés, Javier Rodríguez-Falces, Alberto Pérez-López
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Muscular strength/power was tested at 25%, 50%, 75%, and 90% one-repetition maximum (1RM) for bench press and back squat, while muscular endurance was assessed at 65% 1RM through a set-to-failure. Surface electromyography (EMG) measured muscle electrical activity.</p><p><strong>Results: </strong>In muscular strength/power tests, caffeine increased mean velocity (V<sub>mean</sub>) and power output (W<sub>mean</sub>) in the back squat at 75% (P = 0.012-0.001, g = 3.84-2.71) and 90%1RM (P = 0.043-0.009, g = 2.77-2.46) in both morning and evening trials. At 25%1RM, caffeine counteracts morning performance decline in bench press (10-11%, P = 0.001, g = 2.62-1.68) and back squat (8-11%, P = 0.010-0.003, g = 2.22-1.64). In muscular endurance tests, caffeine increased V<sub>mean</sub> and W<sub>mean</sub> in bench press in the morning (11-12%, P = 0.003-0.005, g = 2.55-1.89) and back squat in both morning and evening trials (6-9%, P = 0.001-0.027, g = 2.79-1.73). EMG activity remained unchanged in all conditions.</p><p><strong>Conclusions: </strong>Acute caffeine intake enhances muscular strength/power at moderate-to-high loads (75%- 90%1RM) and endurance performance (65%1RM) in the back squat while counteracting morning declines at light-load (25%1RM) for both exercises without altering muscle electrical activity.</p>","PeriodicalId":12005,"journal":{"name":"European Journal of Applied Physiology","volume":" ","pages":""},"PeriodicalIF":2.7000,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Acute caffeine intake improves muscular strength, power, and endurance performance, reversing the time-of-day effect regardless of muscle activation level in resistance-trained males: a randomized controlled trial.\",\"authors\":\"Juan Jesús Montalvo-Alonso, Marta Del Val-Manzano, Ester Cerezo-Telléz, Carmen Ferragut, David Valadés, Javier Rodríguez-Falces, Alberto Pérez-López\",\"doi\":\"10.1007/s00421-025-05820-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Introduction: </strong>This study examined the effects of acute caffeine intake on muscular electrical activity during strength, power, and endurance performance tests at different times of day in bench press and back squat exercises.</p><p><strong>Methods: </strong>Thirteen resistance-trained men participated in a triple-blind, cross-over, randomized controlled trial with four conditions: (a) morning with caffeine, (b) morning with placebo, (c) evening with caffeine, and (d) evening with placebo. 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引用次数: 0
摘要
简介：本研究检测了急性咖啡因摄入对肌肉电活动的影响，在力量、力量和耐力测试中，在一天的不同时间进行卧推和后蹲练习。方法：13名接受抗阻训练的男性参加了一项三盲、交叉、随机对照试验，试验有四种情况：(a)早上服用咖啡因，(b)早上服用安慰剂，(c)晚上服用咖啡因，(d)晚上服用安慰剂。试验在上午9点和下午6点进行，参与者提前60分钟摄入咖啡因或安慰剂（3mg /kg）。肌肉力量/力量测试在25%、50%、75%和90%的单次最大重复（1RM）下进行卧推和后蹲，而肌肉耐力测试在65% 1RM下进行。表面肌电图（EMG）测量肌肉电活动。结果：在肌肉力量/力量测试中，咖啡因增加了75% （P = 0.012-0.001, g = 3.84-2.71）和90% （P = 0.043-0.009, g = 2.77-2.46）的后蹲平均速度（Vmean）和力量输出（Wmean）。在25%1RM时，咖啡因抵消了早晨卧推（10-11%,P = 0.001, g = 2.62-1.68）和后蹲（8-11%,P = 0.010-0.003, g = 2.22-1.64）的表现下降。在肌肉耐力试验中，咖啡因增加了早晨卧推的Vmean和Wmean （11-12%, P = 0.003-0.005, g = 2.55-1.89）和早晨和晚上的后蹲试验（6-9%,P = 0.001-0.027, g = 2.79-1.73）。在所有条件下肌电活动保持不变。结论：在不改变肌肉电活动的情况下，急性咖啡因摄入可以增强中高负荷（75%- 90%1RM）下的肌肉力量/力量和后蹲时的耐力表现（65%1RM），同时抵消轻负荷（25%1RM）下的晨起下降。
Acute caffeine intake improves muscular strength, power, and endurance performance, reversing the time-of-day effect regardless of muscle activation level in resistance-trained males: a randomized controlled trial.
Introduction: This study examined the effects of acute caffeine intake on muscular electrical activity during strength, power, and endurance performance tests at different times of day in bench press and back squat exercises.
Methods: Thirteen resistance-trained men participated in a triple-blind, cross-over, randomized controlled trial with four conditions: (a) morning with caffeine, (b) morning with placebo, (c) evening with caffeine, and (d) evening with placebo. Trials were conducted at 9:00 AM and 6:00 PM, with participants consuming caffeine or placebo (3 mg/kg) 60 min prior. Muscular strength/power was tested at 25%, 50%, 75%, and 90% one-repetition maximum (1RM) for bench press and back squat, while muscular endurance was assessed at 65% 1RM through a set-to-failure. Surface electromyography (EMG) measured muscle electrical activity.
Results: In muscular strength/power tests, caffeine increased mean velocity (Vmean) and power output (Wmean) in the back squat at 75% (P = 0.012-0.001, g = 3.84-2.71) and 90%1RM (P = 0.043-0.009, g = 2.77-2.46) in both morning and evening trials. At 25%1RM, caffeine counteracts morning performance decline in bench press (10-11%, P = 0.001, g = 2.62-1.68) and back squat (8-11%, P = 0.010-0.003, g = 2.22-1.64). In muscular endurance tests, caffeine increased Vmean and Wmean in bench press in the morning (11-12%, P = 0.003-0.005, g = 2.55-1.89) and back squat in both morning and evening trials (6-9%, P = 0.001-0.027, g = 2.79-1.73). EMG activity remained unchanged in all conditions.
Conclusions: Acute caffeine intake enhances muscular strength/power at moderate-to-high loads (75%- 90%1RM) and endurance performance (65%1RM) in the back squat while counteracting morning declines at light-load (25%1RM) for both exercises without altering muscle electrical activity.
期刊介绍：
The European Journal of Applied Physiology (EJAP) aims to promote mechanistic advances in human integrative and translational physiology. Physiology is viewed broadly, having overlapping context with related disciplines such as biomechanics, biochemistry, endocrinology, ergonomics, immunology, motor control, and nutrition. EJAP welcomes studies dealing with physical exercise, training and performance. Studies addressing physiological mechanisms are preferred over descriptive studies. Papers dealing with animal models or pathophysiological conditions are not excluded from consideration, but must be clearly relevant to human physiology.
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