Universidad de Alcalá, Facultad de Medicina y Ciencias de la Salud, Departamento de Ciencias Biomédicas, Área de Educación Física y Deportiva, 28801 Madrid, Spain.
Cambridge Centre for Sport and Exercise Sciences, School of Psychology and Sport Science, Anglia Ruskin University, Cambridge CB1 1PT, UK.
Nutrients. 2024 Jun 4;16(11):1760. doi: 10.3390/nu16111760.
This study assessed the impact of acute caffeine intake on muscular strength, power, and endurance performance between resistance-trained male and female individuals according to load in upper- and lower-body exercises.
Here, 76 resistance-trained individuals (38 females, 38 males) participated in a study comparing caffeine and a placebo. Each received either 3 mg/kg of caffeine or a placebo 60 min before tests measuring muscular strength and power through bench press and back squat exercises at different intensities (25%, 50%, 75%, 90% 1RM). Muscular endurance at 65% 1RM was also assessed by performing reps until reaching task failure.
Compared to placebo, caffeine increased mean, peak and time to reach peak velocity and power output ( < 0.01, η = 0.242-0.293) in the muscular strength/power test in males and females. This effect was particularly observed in the back squat exercise at 50%, 75% and 90% 1RM (2.5-8.5%, < 0.05, g = 1.0-2.4). For muscular endurance, caffeine increased the number of repetitions, mean velocity and power output ( < 0.001, η = 0.177-0.255) in both sexes and exercises (3.0-8.9%, < 0.05, g = 0.15-0.33).
Acute caffeine intake resulted in a similar ergogenic effect on muscular strength, power, and endurance performance in upper- and lower-body exercises for male and female resistance-trained participants.
本研究根据上、下身运动的负荷，评估了急性咖啡因摄入对男性和女性经过抗阻训练的个体肌肉力量、功率和耐力表现的影响。
在这里，76 名经过抗阻训练的个体（38 名女性，38 名男性）参与了一项比较咖啡因和安慰剂的研究。每个人在测试前 60 分钟接受 3mg/kg 的咖啡因或安慰剂，通过卧推和深蹲练习测量不同强度（25%、50%、75%、90%1RM）的肌肉力量和功率。通过进行重复次数直到达到任务失败，也评估了 65%1RM 的肌肉耐力。
与安慰剂相比，咖啡因增加了男性和女性肌肉力量/功率测试中平均、峰值和达到峰值速度和功率输出的时间（<0.01，η=0.242-0.293）。这种效应在深蹲练习中尤其在 50%、75%和 90%1RM 时观察到（2.5-8.5%，<0.05，g=1.0-2.4）。对于肌肉耐力，咖啡因增加了重复次数、平均速度和功率输出（<0.001，η=0.177-0.255），在两性和运动中均观察到（3.0-8.9%，<0.05，g=0.15-0.33）。
急性咖啡因摄入对上、下身抗阻训练参与者的运动中肌肉力量、功率和耐力表现产生了相似的促进作用。
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