Acute Effects of Beetroot Juice Ingestion on Isometric Knee Extension Strength, Explosive Strength and Local Muscular Endurance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 20
- 试验地点
- 1
- 主要终点
- Knee extension strength
研究概览
简要总结
This is a double-blind placebo-controlled cross-over trial that aims to determine the acute effect of beetroot juice ingestion on isometric knee extension strength, explosive strength and local muscular endurance.
详细描述
The study aims to determine whether concentrated beetroot juice has an acute effect on isometric strength of the knee muscles and the rate of force development in knee extension, as well as endurance of the same muscle. This will be a cross-over study. 20 subjects will be randomly selected to the experimental group or control group; after 1 week, participants will repeat the measurements in the other condition. Subjects will consume 140 ml of beetroot juice extract 2.5 hours before the measurement or placebo (140 ml of blackcurrant juice with added appropriate amount of sugar to equalize the carbohydrate value and lemon juice fort the taste). An isometric dynamometer will be used to measure the isometric strength of the knee extensors. Investigators will quantify peak force, rate of force development, endurance of knee extensors at 50 % of the maximal force, and the force recovery after a fatiguing protocol.
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)
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
- •Age between 18 and 30 years
- •Physically active and healthy athletes (recreational or professional)
排除标准
- •Cardiovascular, pulmonary, metabolic, neurological diseases and musculoskeletal injuries
- •Consumption of drugs such as antacids and proton pump inhibitors in the previous 3 months
- •Pregnant or breastfeeding women
- •Beetroot allergic participants
研究组 & 干预措施
Experimental condition, receiving beetroot juice supplement
Participants will receive beetroot juice intervention in the experimental condition.
干预措施: Beetroot juice concentrate (140 ml) (Dietary Supplement)
Placebo condition
Participants will receive placebo (blackcurrant juice) in the placebo condition
干预措施: Blackcurrant juice (placebo) (Dietary Supplement)
结局指标
主要结局
Knee extension strength
时间窗: 2 hours after the ingestion of beetroot juice or placebo
The peak force during maximal voluntary contraction of knee extensors
次要结局
- Knee extension local muscle endurance(2 hours after the ingestion of beetroot juice or placebo)
- Knee extension explosive strength(2 hours after the ingestion of beetroot juice or placebo)
研究者
Zala Jenko Praznikar
Associate Professor
University of Primorska