Biomolecular and Sports Sciences, Coventry University, Coventry, UK.
Eur J Sport Sci. 2013;13(4):392-9. doi: 10.1080/17461391.2011.635811. Epub 2011 Dec 5.
The efficacy of caffeine ingestion in enhancing aerobic performance is well established. However, despite suggestions that caffeine may enhance resistance exercise performance, research is equivocal on the effect of acute caffeine ingestion on resistance exercise performance. It has also been suggested that dampened perception of perceived exertion and pain perception might be an explanation for any possible enhancement of resistance exercise performance due to caffeine ingestion. Therefore, the aim of this study was to examine the acute effect of caffeine ingestion on repetitions to failure, rating of perceived exertion (RPE) and muscle pain perception during resistance exercise to failure. Eleven resistance trained individuals (9 males, 2 females, mean age±SD=26.4±6.4 years), took part in this double-blind, randomised cross-over experimental study whereby they ingested a caffeinated (5 mg kg(-1)) or placebo solution 60 minutes before completing a bout of resistance exercise. Experimental conditions were separated by at least 48 hours. Resistance exercise sessions consisted of bench press, deadlift, prone row and back squat exercise to failure at an intensity of 60% 1 repetition maximum. Results indicated that participants completed significantly greater repetitions to failure, irrespective of exercise, in the presence of caffeine (p=0.0001). Mean±S.D of repetitions to failure was 19.6±3.7 and 18.5±4.1 in caffeine and placebo conditions, respectively. There were no differences in peak heart rate or peak blood lactate values across conditions (both p >0.05). RPE was significantly lower in the caffeine compared to the placebo condition (p=0.03) and was significantly higher during lower body exercises compared to upper body exercises irrespective of substance ingested (p=0.0001). For muscle pain perception, a significant condition by exercise interaction (p=0.027) revealed that muscle pain perception was lower in the caffeine condition, irrespective of exercise. With caffeine, pain perception was significantly higher in the deadlift and back squat compared to the bench press. However, with placebo, pain perception was significantly higher for the deadlift and back squat compared to the prone row only. Therefore, acute caffeine ingestion not only enhances resistance exercise performance to failure but also reduces perception of exertion and muscle pain.
咖啡因摄入提高有氧运动能力的功效已得到充分证实。然而，尽管有研究表明咖啡因可以提高抗阻运动表现，但关于急性咖啡因摄入对抗阻运动表现的影响，研究结果尚存在争议。也有人提出，由于咖啡因的摄入，感知费力和疼痛感知的减弱可能是解释抗阻运动表现增强的原因之一。因此，本研究旨在探讨咖啡因摄入对力竭性抗阻运动中重复次数、主观用力程度（RPE）和肌肉疼痛感知的急性影响。11 名抗阻训练的个体（9 名男性，2 名女性，平均年龄±标准差=26.4±6.4 岁）参与了这项双盲、随机交叉实验研究，他们在完成抗阻运动前 60 分钟分别摄入含咖啡因（5mg/kg）或安慰剂溶液。实验条件至少间隔 48 小时。抗阻运动包括卧推、硬拉、俯身划船和深蹲，运动强度为 60%的 1 次重复最大强度。结果表明，无论运动项目如何，参与者在摄入咖啡因时都能完成更多的力竭重复次数（p=0.0001）。在咖啡因和安慰剂条件下，力竭重复次数的平均值分别为 19.6±3.7 和 18.5±4.1。各条件下的最大心率和最大血乳酸值均无差异（均 p>0.05）。与安慰剂相比，咖啡因组的 RPE 显著降低（p=0.03），且无论摄入何种物质，下半身运动时的 RPE 均显著高于上半身运动（p=0.0001）。对于肌肉疼痛感知，条件与运动的交互作用有显著差异（p=0.027），这表明无论运动项目如何，在咖啡因条件下肌肉疼痛感知均较低。与安慰剂相比，在硬拉和深蹲中，咖啡因组的疼痛感知明显更高。然而，在硬拉和深蹲中，与俯身划船相比，只有在服用安慰剂时，疼痛感知才明显更高。因此，急性咖啡因摄入不仅能增强力竭性抗阻运动能力，还能降低用力感知和肌肉疼痛感知。
