Habitual Caffeine Intake Affects the Ergogenicity of Dosing Regimens on Muscular Endurance But Not on Sprint and Cognitive Performance in Men and Women
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 69
- 试验地点
- 1
- 主要终点
- Upper- and Lower-boy muscular endurance
研究概览
简要总结
The impact of caffeine habituation on acute responses to different doses of caffeinated coffee has received minimal attention. This study aimed to investigate the effects of different doses of coffee on physical and cognitive performance in men and women with different levels of daily caffeine consumption. Sixty-nine (35 women) athletes participated in this study, attending 4 experimental visits in a double-blind, randomized, crossover fashion: decaffeinated coffee (PLA), 1.5 mg·kg-1 (LCOF), 3 mg·kg-1 (MCOF) and 6 mg·kg-1 of caffeine (HCOF) from coffee ingestion. Sixty min after coffee consumption, participants performed squat and bench press exercises (1 repetition maximum, 1RM), 60% of 1RM muscular endurance (ME), maximal sprinting, and cognitive performance (CP) was assessed. Participants were allocated into low (LGROUP), moderate (MGROUP), and high (HGROUP) caffeine consumption groups.
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
Supplements were allocated in a randomised order and double-blinding design was implemented by an independent technician who did not take part in the study. The randomisation and blinding were held until the end of the study.
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Healthy individuals
- •Physically active individuals
- •Non-smokers
- •Age between 18 and 30 years
- •Free from respiratory insufficiency
- •Free from cardiovascular disease
- •Free from neuromuscular disorders
- •Free from musculoskeletal injury within the previous 6 months
排除标准
- •Diagnosed cardiovascular disease
- •Neuromuscular disease
- •Current limb injury
- •History of limb injury requiring treatment within the previous 6 months
- •Chronic respiratory disease or treatment for chronic respiratory conditions
研究组 & 干预措施
Low dose caffeine supplementation
consuming 0.12 g·kg-1 of decaffeinated coffee + 0.04 g·kg-1 of caffeinated coffee to achieve 1.5 mg·kg-1 of caffeine intake 60-min before the experimental trial.
干预措施: Low Dose Caffeine (LCOF) (Dietary Supplement)
Moderate dose caffeine supplementation
Consuming 0.08 g·kg-1 of decaffeinated coffee + 0.08 g·kg-1 of caffeinated coffee to achieve 3 mg·kg-1 of caffeine intake 60-min before the experimental trial.
干预措施: Moderate Dose Caffeine (MCOF) (Dietary Supplement)
High dose caffeine supplementation
Consuming 0.16 g·kg-1 of caffeinated coffee to achieve 6 mg·kg-1 of caffeine intake 60-min before the experimental trial.
干预措施: High Dose Caffeine (HCOF) (Dietary Supplement)
Placebo
Consuming 0.16 g·kg-1 of decaffeinated coffee 60-min before the experimental trial.
干预措施: Placebo (PLA) (Dietary Supplement)
结局指标
主要结局
Upper- and Lower-boy muscular endurance
时间窗: 60 minutes after caffeine or placebo ingestion (during each experimental trial)
Muscular endurance assessed during bench press and squat exercises using 60% of one-repetition maximum (1RM). Performance expressed as total weight lifted (kg).
Upper- and lower-body strenght
时间窗: 60 minutes after caffeine or placebo ingestion (during each experimental trial)
Maximal dynamic strength assessed using one-repetition maximum (1RM) tests in the squat and bench press exercises (kg).
次要结局
- Sprint Performance(60 minutes after caffeine or placebo ingestion (during each experimental trial))
- Cognitive performance(Baseline (before caffeine ingestion) and 60 minutes after caffeine or placebo ingestion.)
研究者
Dr Ozcan Esen
Assistant Professor
Northumbria University