PDF(Pubmed)
Abstract：
BACKGROUND: 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.
METHODS: 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.
RESULTS: Compared to placebo, caffeine increased mean, peak and time to reach peak velocity and power output (p < 0.01, ηp2 = 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%, p < 0.05, g = 1.0-2.4). For muscular endurance, caffeine increased the number of repetitions, mean velocity and power output (p < 0.001, ηp2 = 0.177-0.255) in both sexes and exercises (3.0-8.9%, p < 0.05, g = 0.15-0.33).
CONCLUSIONS: 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.
METHODS: 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.
RESULTS: Compared to placebo, caffeine increased mean, peak and time to reach peak velocity and power output (p < 0.01, ηp2 = 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%, p < 0.05, g = 1.0-2.4). For muscular endurance, caffeine increased the number of repetitions, mean velocity and power output (p < 0.001, ηp2 = 0.177-0.255) in both sexes and exercises (3.0-8.9%, p < 0.05, g = 0.15-0.33).
CONCLUSIONS: 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.
摘要：
背景：这项研究评估了急性咖啡因摄入对肌肉力量的影响，电源,根据上半身和下半身运动的负荷，经过阻力训练的男性和女性个体之间的耐力表现。
方法：这里，76名抵抗训练的个体(38名女性，38名男性）参加了一项比较咖啡因和安慰剂的研究。每个人接受3毫克/千克的咖啡因或安慰剂60分钟，然后通过卧推和背部深蹲运动在不同强度下测量肌肉力量和力量（25％，50%,75%,90%1RM）。还通过执行代表直到达到任务失败来评估65％1RM的肌肉耐力。
结果：与安慰剂相比，咖啡因平均增加，在男性和女性的肌肉力量/力量测试中，峰值和达到峰值速度和功率输出的时间（p<0.01，ηp2=0.242-0.293）。这种效果在50%的背部深蹲运动中尤其明显，75%和90%1RM(2.5-8.5%，p<0.05，g=1.0-2.4)。对于肌肉耐力，咖啡因增加了重复次数，性别和运动的平均速度和功率输出（p<0.001，ηp2=0.177-0.255）（3.0-8.9％，p<0.05,g=0.15-0.33)。
结论：急性咖啡因摄入对肌肉力量产生了类似的麦角效应，电源,男性和女性抵抗训练的参与者在上半身和下半身练习中的耐力表现。
方法：这里，76名抵抗训练的个体(38名女性，38名男性）参加了一项比较咖啡因和安慰剂的研究。每个人接受3毫克/千克的咖啡因或安慰剂60分钟，然后通过卧推和背部深蹲运动在不同强度下测量肌肉力量和力量（25％，50%,75%,90%1RM）。还通过执行代表直到达到任务失败来评估65％1RM的肌肉耐力。
结果：与安慰剂相比，咖啡因平均增加，在男性和女性的肌肉力量/力量测试中，峰值和达到峰值速度和功率输出的时间（p<0.01，ηp2=0.242-0.293）。这种效果在50%的背部深蹲运动中尤其明显，75%和90%1RM(2.5-8.5%，p<0.05，g=1.0-2.4)。对于肌肉耐力，咖啡因增加了重复次数，性别和运动的平均速度和功率输出（p<0.001，ηp2=0.177-0.255）（3.0-8.9％，p<0.05,g=0.15-0.33)。
结论：急性咖啡因摄入对肌肉力量产生了类似的麦角效应，电源,男性和女性抵抗训练的参与者在上半身和下半身练习中的耐力表现。
