Acute caffeine ingestion enhances strength performance and reduces perceived exertion and muscle pain perception during resistance exercise

Abstract

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.     

Caffeine and resistance exercise: the effects of two caffeine doses and the influence of individual perception of caffeine

Abstract

Although caffeine is a widely used ergogenic resource, some information regarding its effects on resistance exercises is still lacking. The objective of the present study was to verify the acute effect of the ingestion of two different doses of caffeine on performance during a session of resistance exercises and to analyze the perception of the subjects in relation to the intake of caffeine. Following a double-blind, randomised, cross-over, controlled, and non-placebo design, 14 trained and healthy men (24.7?±?6.8 years; 79.8?±?9.8?kg; 177.3?±?8.5?cm) performed a training session in chest-press, shoulder-press, and biceps curl exercises (3 sets until exhaustion; 70% 1RM; 3 min rest interval; 2?s for each concentric and eccentric phase) on three non-consecutive days after ingestion of 3?mg.kg^?1 caffeine (CAF3), 6?mg.kg^?1 caffeine (CAF6), or no substance (CON). Subjects were informed that one of the caffeine doses would be placebo. The total number of repetitions performed in CON (93.6?±?22.4) was significantly lower than in CAF3 (108.0?±?19.9, P?=?0.02) and in CAF6 (109.3?±?19.8, P?=?0.03) and there were no differences between caffeine doses. Eight subjects noticed that caffeine was in CAF3 and six in CAF6 and there were no differences in the number of repetitions between sessions in which the subjects perceived and did not perceive caffeine. In conclusion, caffeine doses of 3 or 6?mg.kg^?1 similarly increased performance in resistance upper limb exercises, independent of the subject's perception of substance ingestion.     

振动训练对14-15岁青少年跳远运动员运动成绩的影响研究

本文运用文献资料法、专家访谈法、数理统计法等科研方法,以湛江市体校12名14-15岁的跳远运动员为研究对象,探讨振动训练对青少年跳远运动员成绩的影响。研究认为：振动训练会动员跳远运动员更多甚至全部运动单位参加活动,提高跳远运动员的核心力量,能有效提高受试者的爆发力水平,增大运动员肌肉体积,提高肌肉力量,从而提高运动员的跳远成绩。     

普通高校篮球教学训练中快攻意识的培养与成效研究

根据篮球运动的特点和当代篮球的发展趋势,结合高校教学的进一步改革以及青年学生参与篮球运动中的快攻意识形成及临场运用过程,对青年学生快攻意识的培养及成效进行探讨.认为篮球快攻意识是一个较为复杂的、细腻的,并且需要长期学习和培养的连续性过程,是通过反复练习和比赛实践逐渐积累形成的.在对学生进行篮球技术、战术教学的同时,必须有计划、有目的、有步骤地进行课堂教学比赛进攻快攻意识的科学训练方法,并使之贯穿于整个阶段教学过程、训练过程中,使快攻意识与其它战术意识和技、战术训练密切结合,并有效和谐的发展.     

运动员核心力量训练的本质

对核心力量训练在备战2008-2012年奥运会、亚运会和全运会实践研究后发现：1)运动员核心力量训练主要由核心稳定性训练、关节养护性训练及核心专门性训练组成;2)核心稳定性是指核心肌群在神经肌肉系统、骨骼韧带系统以及呼吸调节系统的协同作用下,稳定身体姿势和重心、产生和传递上下肢力量的能力;3)关节养护性训练是指针对易伤部位和薄弱环节所进行以伤病防护为主的体能训练理念和方法;4)核心稳定性与关节养护性训练是进行核心专门性力量训练的前提和基础;5)核心专门性力量训练是核心力量训练的本质和关键,是指根据专项动作模式的特殊需求以及运动员体能特点来进行的具有专项针对性核心力量训练,也即运动员的动态稳定性和强大的腰髋收缩力量。     

由功能性动作筛查结果看武术套路运动员的体能训练

对广东省武术套路项目一线运动员进行功能性动作筛查（FMS）,经过对筛查结果进行分析发现,广东省武术套路项目运动员整体FMS筛查结果比较理想（平均得分16.07）,但在躯干稳定俯卧撑以及旋转稳定性测试中得分较低,另外在跨栏架和直线弓步测试中分别有43%和36%的队员出线双侧不均衡的情况,表明核心稳定性不足以及非对称性动作时双侧肢体功能表现不均衡的问题较为突出,需要在专项体能训练中进一步改善和加强。     

用科学训练理念指导青少年手球训练

采用文献资料、观察与数理统计分析、专家咨询与个人执教经验等方法,研究用科学训练理念指导青少年课余手球训练,取得良好的比赛成绩。归纳为：培养青少年在手球运动中享受快乐;向青少年传授简捷、实用的手球技术,培养其技术运用的准确与对抗能力;运用归因理论,引导青少年学会正确的归因;合理分组增加青少年成功的体验,坚定信心;运用阳性反馈理论指导青少年手球训练;注重培养青少年的观察能力与直觉思维能力;循序渐进地安排青少年的对抗性技术训练。     

短期力量练习对老年人肌肉力量和身体功能的影响

为了充分证实不同的力量练习计划对老年人体质健康影响的效果,通过对比高速率的变阻训练(HV)、由慢到快速率的等阻训练(CT)以及高速率的变阻练习与身体功能练习相结合(CB)的3种不同的短期力量练习计划对老年人的肌肉功能和身体活动能力的影响进行了实证性研究。研究结果显示:与控制组(CO)相比,HV组、CT组以及CB组的肌肉力量都有显著性的提高,而CO的力量呈轻微的下降趋势;每周两次的HV练习在提高力量和爆发性身体功能时,要优于CT和CB组;与HV和CT组相比,CB组对增加老年人的力量也是有效的,这个结果对于那些不愿意或不能频繁参加力量练习的老年人是一个重要提示。     

短道速滑向速度滑冰项目转型的优劣势分析

从克莱普冰刀的特点、弯道身体倾斜角度、蹬冰角度、疾跑技术和衔接技术等方面对短道速滑和速度滑冰的直道技术、弯道技术和起跑技术进行对比分析,指出短道速滑运动员的弯道技术要优于速度滑冰运动员,从而成为短道速滑向速度滑冰转型的运动员的主要优势,相应的直道技术则沦为劣势,以此可作为判断运动员是否适合转型,以及改进转型后的技术动作的依据。     

体育学院应用型专业人才培养新型发展模式构思——基于对重庆文理学院孙泽平校长应用型人才培养讲解的深刻感悟

根据重庆文理学院孙泽平校长对应用型人才培养目标的讲解,结合目前体育学院专业人才的培养现状,运用逻辑分析等研究方法从应用型人才培养的角度,对新时期体育学院人才培养模式的创新构建与发展进行了构思,并欲以通过"四个转变"、"三个培养"、"两个发展"和"一个提高"来全面展开。