Effect of Acute Caffeine Intake on Muscle Electrical Activity and Muscular Strength, Power, and Endurance Performance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 12
- 试验地点
- 2
- 主要终点
- Mean velocity at different %1RM
研究概览
简要总结
Introduction: Several studies have evaluated and confirmed the ergogenic effects of acute caffeine intake on sports performance. However, some studies suggest that this effect predominantly occurs in large muscle groups, potentially due to increased skeletal muscle electrical activity.
Objectives: This study aims to evaluate the acute effects of caffeine intake on strength, power, muscle endurance, and muscle electrical activity in young adults. It will also analyze the influence of circadian rhythms (morning vs. afternoon) on exercise performance (bench press vs. squat).
Methods: Twelve healthy, physically active participants will be recruited for the study. Using a triple-blind, crossover, randomized, and controlled design, participants will ingest either caffeine (3 mg/kg body mass) or a placebo (maltodextrin, 3 mg/kg) 60 minutes before the trial. Muscular strength, power, and endurance performance will then be assessed through 1RM tests, and at 25%, 50%, 75%, and 90% of 1RM, along with muscle endurance tests at 65% of 1RM, for both squat and bench press exercises. EMG will be used to measure skeletal muscle electrical activity during the tests. The experimental sessions will be conducted in the morning (8:00 am to 10:00 am) and the afternoon (4:30 pm to 6:30 pm).
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Other
- 盲法
- Double (Participant, Investigator)
盲法说明
Statistician
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age between 18 and 35 years.
- •Body Mass Index (BMI) < 25 kg/m².
- •Resistance-trained individuals (more than 2 years of structured training).
- •Healthy men and women without neurological, cardiometabolic, immunological, or physical conditions that prevent them from exercising.
- •Participants must be able to perform the tests described in the following section.
排除标准
- •History of neuromuscular diseases, heart disease, or conditions that may affect liver or muscle metabolism.
- •Use of drugs, stimulants, or sports supplements that could interfere with the dietary supplement used in the study.
- •Sedentary habits (less than 150 minutes/week of moderate exercise).
- •Having undergone prolonged periods of physical inactivity in the 6 months prior to the study.
- •Engaging in strenuous exercise within 48 hours prior to the tests.
- •Failure to replicate the same food intake on both experimental days.
- •Consumption of caffeine or any other stimulant after 6 pm on the day before the tests, to avoid headaches, discomfort, or lethargy in regular caffeine consumers.
结局指标
主要结局
Mean velocity at different %1RM
时间窗: Through study completion, an average of 4 weeks
Measuring bar mean velocity desplacement during bench press and back squat exercises.
Peak velocity at different %1RM
时间窗: Through study completion, an average of 4 weeks
Measuring bar peak velocity and time to reach peak velocity of bar desplacement during bench press and back squat exercises.
Mean power output at different %1RM
时间窗: Through study completion, an average of 4 weeks
Measuring during bench press and back squat exercises.
Peak power output and time to reach peak power output at different %1RM
时间窗: Through study completion, an average of 4 weeks
Measuring during bench press and back squat exercises.
Number of repetitions performed in 1 set at 65%1RM until task failure
时间窗: Through study completion, an average of 4 weeks
Bar velocity deplacement performed in 1 set at 65%1RM until task failure
时间窗: Through study completion, an average of 4 weeks
In bench press and back squat exercises
Power output generated in 1 set at 65%1RM until task failure
时间窗: Through study completion, an average of 4 weeks
In bench press and back squat exercise
Muscle electrical activity (EMG).
时间窗: Through study completion, an average of 4 weeks
Root-mean-square (RMS) and maximal voluntary contraction (MVC) from pectoralis major and triceps (bench press) and from rectus femoris and vastus lateralis (Back squat).
次要结局
- Mood state (tension, depression, anger, vigor, fatigue and confusion)(Through study completion, an average of 4 weeks)
- Adverse effects(Through study completion, an average of 4 weeks)
研究者
Alberto Pérez-López
Principal Investigator
University of Alcala