Comparison Effects of Acute and Short-Term Consumption of Different Doses of Caffeine on Strength and Power Indices in Habitual Caffeine-Consuming Women
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 36
- 试验地点
- 1
- 主要终点
- Change in Peak Power (PP) During Maximal Strength Test
研究概览
简要总结
This study compares the effects of acute (single-session) and short-term (7-day) consumption of different doses of caffeine (3 and 6 mg/kg) on maximal strength, strength endurance, vertical jump, and medicine ball throw performance in habitual caffeine-consuming women (daily intake of 5 mg/kg). Thirty-six resistance-trained women were randomly assigned to three groups: 3 mg/kg caffeine, 6 mg/kg caffeine, or placebo in a double-blind crossover design. Participants completed both acute (60 min pre-exercise) and short-term (7 consecutive days) protocols. The main findings showed that acute ingestion of 6 mg/kg caffeine impaired peak power in the maximal strength test, while short-term consumption of the same dose improved peak power in the strength-endurance test. The 3 mg/kg dose was ineffective in all conditions. Caffeine did not affect jump or throw performance. The study highlights the need for individualized caffeine guidelines based on timing, dosage, and habituation status.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Basic Science
- 盲法
- Double (Participant, Investigator)
盲法说明
Double Blind
入排标准
- 年龄范围
- 20 Years 至 30 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Absence of neuromuscular and musculoskeletal disorders
- •At least 2 years of regular resistance training experience (minimum 3 sessions per week)
- •At least 6 months of resistance training prior to enrollment
- •Absence of renal and hepatic disorders
- •Daily caffeine consumption of 5 mg/kg body weight (based on questionnaire)
- •No use of specific medications or supplements that could affect study outcomes (e.g., beta-alanine, creatine, pre-workout supplements) -
排除标准
- •Occurrence of any injury during the study
- •Failure to adhere to the supplement consumption protocol
- •Withdrawal from the study-
研究组 & 干预措施
Caffeine 3 mg/kg
Participants received 3 mg/kg body weight of caffeine powder in gelatin capsules daily for 7 days. Acute consumption: 60 minutes before testing. Short-term consumption: 7 consecutive days
干预措施: Caffeine 3 mg/kg (Dietary Supplement)
Placebo
Participants received identical capsules containing flour, consumed daily for 7 days
干预措施: Placebo (Dietary Supplement)
Caffeine 6 mg/kg
Participants received 6 mg/kg body weight of caffeine powder in gelatin capsules daily for 7 days. Acute consumption: 60 minutes before testing. Short-term consumption: 7 consecutive days
干预措施: Caffeine 6 mg/kg (Dietary Supplement)
结局指标
主要结局
Change in Peak Power (PP) During Maximal Strength Test
时间窗: Baseline, 60 minutes post-ingestion (acute), and after 7 days of supplementation (short-term)
Peak concentric power (Watts) during 1-RM bench press test, measured using a validated Kinect camera
次要结局
- Change in Peak Power During Strength-Endurance Test(Baseline, 60 minutes post-ingestion (acute), and after 7 days of supplementation (short-term))
- Change in Medicine Ball Throw Distance(Baseline, 60 minutes post-ingestion (acute), and after 7 days of supplementation (short-term))
- Change in Vertical Jump Height(Baseline, 60 minutes post-ingestion (acute), and after 7 days of supplementation (short-term))
- Change in Number of Repetitions (Strength-Endurance)(Baseline, 60 minutes post-ingestion (acute), and after 7 days of supplementation (short-term))
研究者
Mohsen mohammadnia ahmadi
Assistant Professor of Exercise Physiology
Birjand University of Medical Sciences