"Effects of a Beetroot-Based Functional Beverage on Repeated Sprint Performance: A Randomized, Double-Blind, Placebo-Controlled Crossover Trial"
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 10
- 主要终点
- Mean power output (W) during six maximal 35-m sprints
研究概览
简要总结
This randomized, double-blind, placebo-controlled crossover trial aims to evaluate the acute effects of a nitrate-rich beetroot-based beverage on repeated sprint performance in trained athletes.
Ten athletes will complete two experimental conditions in randomized order: beetroot beverage (BET) and placebo (PLA), separated by a 7-day washout period. The beetroot beverage consists of 200 mL of a mixture containing beetroot, cocoa, and green tea, providing approximately 6.4 mmol of nitrate.
In each condition, participants will perform a Running Anaerobic Sprint Test (RAST), consisting of six maximal 35-meter sprints with 10 seconds of passive recovery between sprints. The primary outcome is mean power output across the six sprints.
Secondary outcomes include fatigue index, sprint-by-sprint power output, heart rate, rating of perceived exertion (Borg 6-20 scale), maximal oxygen uptake (VO₂max), and sleep quality assessed using the Insomnia Severity Index (ISI).
详细描述
This randomized, double-blind, placebo-controlled crossover trial is designed to investigate the acute effects of a nitrate-rich beetroot-based beverage on repeated sprint performance in trained athletes.
Ten athletes will participate in two experimental sessions in randomized order: beetroot beverage (BET) and placebo (PLA). Randomization will determine the sequence of beverage administration. Participants and investigators will be blinded to treatment allocation.
After beverage ingestion, participants will perform a standardized warm-up followed by the Running Anaerobic Sprint Test (RAST), consisting of six maximal 35-meter sprints with 10 seconds of passive recovery between sprints. Sprint time will be recorded using electronic timing, and power output will be calculated using body mass and sprint time.
The primary outcome measure is mean power output across all six sprints. Secondary outcomes include:
Fatigue index (percentage decrement across sprints)
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
- Triple (Participant, Investigator, Outcomes Assessor)
盲法说明
The study was conducted under a double-blind design. Both participants and investigators were unaware of the beverage allocation (beetroot-based beverage or placebo). The beverages were matched in volume (200 mL), color, taste, and texture. Allocation was performed by an independent researcher not involved in data collection or analysis. Outcome assessors and data analysts were blinded to treatment order until completion of statistical analyses.
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Healthy trained athletes
- •Age between 18-35 years
- •Regular training ≥3 times/week
- •No cardiovascular or metabolic disease
排除标准
- •Healthy trained athletes
- •Age between 18-35 years
- •Regular training ≥3 times/week
- •No cardiovascular or metabolic disease
研究组 & 干预措施
Beetroot Beverage (BET)
Participants consumed 200 mL of a beetroot-based antioxidant beverage containing beetroot, cocoa, and green tea extract, providing approximately 6.4 mmol of dietary nitrate. The beverage was ingested 2-3 hours before performing the exercise test.
干预措施: Beetroot-based antioxidant beverage (Dietary Supplement)
Placebo Beverage (PLA)
Participants consumed 200 mL of a placebo beverage matched for color, taste, and texture but without nitrate or active antioxidant compounds. The beverage was ingested 2-3 hours before performing the exercise test.
干预措施: Beetroot-based antioxidant beverage (Dietary Supplement)
结局指标
主要结局
Mean power output (W) during six maximal 35-m sprints
时间窗: Baseline and immediately post-intervention.
Mean power output will be calculated from six maximal 35-m sprint efforts separated by standardized recovery intervals. Sprint time will be recorded and converted to power output (W). The mean value across all six sprints will be used as the outcome measure.
次要结局
未报告次要终点
研究者
Emmanuel Omar Ponce Dávila
Principal Investigator
Universidad Autonoma de Chihuahua