The Effects of Isotonic Beetroot Supplementation on Sprint Interval Exercise Performance.
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 24
- 试验地点
- 1
- 主要终点
- Power output during maximal sprint cycling
研究概览
简要总结
This study aims to examine the effects of dietary nitrate supplementation via beetroot juice on sprint interval cycling exercise performance. Twenty-four participants (male or female) will undertake a randomized, crossover trial where they consume either (i) an isotonic beetroot juice drink containing nitrate (12.9 mmol) for 5 days or (ii) an isotonic sports drink (no nitrate) for 5 days. On Day 5 of each trial, participants will come to the laboratory and 2 hours after consuming their allocated drink will complete a 6 bouts of sprint interval exercise. Power output during cycling will be measured as the primary outcome measure. Salivary and plasma measures of nitrate and nitrite will be taken over the course of the morning on Day 5. After a 5-day washout period participants will crossover and begin their second trial.
详细描述
This study aims to examine the effects of dietary nitrate supplementation via beetroot juice on sprint interval cycling exercise performance. Twenty-four participants (male or female) will undertake a randomized, crossover trial where they consume either (i) an isotonic beetroot juice drink containing nitrate (12.9 mmol) for 5 days or (ii) an isotonic sports drink (no nitrate) for 5 days. Drinks will be equivalent in isotonicity and colored the same so that participants and investigators will be blinded to each trial. Randomization and drink allocation will be completed by a third person not associated with the study team. On Day 5 of each trial, participants will come to the laboratory and 2 hours after consuming their allocated drink will complete a 6 bouts of sprint interval exercise (10 second all-out maximal sprints interspersed with 50 seconds rest). Power output (peak and mean) during cycling sprints will be measured as the primary outcome measure. Salivary measures of nitrate/nitrite will be taken at three time points over the course of the morning on Day 5 - (i) pre-drink consumption; (ii) 2 hours post-drink consumption; and (iii) post-exercise. Plasma measures of nitrate and nitrite will be taken at two time points over the course of the morning on Day 5 - (i) pre-drink consumption; and (ii) 2 hours post-drink consumption. Near infra-red spectroscopy (NIRS) will be used to measure muscle (vastus lateralis) oxygenation during cycling bouts. A Stroop test to measure inhibition (executive function) will be taken pre- and post-exercise. Sensory perception of the drink will be measured immediately post-consumption on Day 5. After a 5-day washout period participants will crossover and begin their second trial.
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
Both isotonic drinks (high nitrate or no nitrate) are deidentified and labelled (coded) by a third party not involved with the research. Randomization and allocation are completed by a third party not involved in the testing.
入排标准
- 年龄范围
- 21 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age: 21 - 40 years
- •Healthy and injury-free (e.g., no cardiovascular disease, diabetes mellitus, orthopaedic impairment that interferes with moderate-to-vigorous exercise)
- •Blood pressure < 130/90 mmHg
- •Be physically active: Engaging in a minimum of 150 minutes of moderate-intensity exercise or 75 minutes of vigorous-intensity physical activity each week.
- •Recreational cyclist (Minimum 1 hour cycling per week).
- •Body mass index: 18.5-25 kg/m2
- •Non-smoker
排除标准
- •Any allergies to beetroot or isotonic drink.
- •Any diagnosed form of cardiometabolic disease (heart disease, stroke, peripheral vascular disease, diabetes, metabolic syndrome, high blood pressure).
- •Any symptoms contraindicating exercise testing (e.g. chest pains).
- •Any balance or dizziness problems.
- •Any chronic medical conditions (whether medicated or not).
- •Any bone joint problems.
- •Any Physician diagnosed contraindications to exercise.
- •Any other health problems that may be a cause for concern or contraindication to exercise.
- •Any recent Covid vaccination (within last 2 weeks).
研究组 & 干预措施
High nitrate
High nitrate isotonic drink
干预措施: Dietary Supplement: High nitrate isotonic drink (Other)
No nitrate
No nitrate isotonic drink
干预措施: Dietary Supplement: No nitrate isotonic drink (Other)
结局指标
主要结局
Power output during maximal sprint cycling
时间窗: 2 hours after drink ingestion
Peak and mean power output
次要结局
- Plasma nitrate and nitrite(Pre-drink and 2 hours post-drink)
- Sensory evaluation (Acceptance and Preference Test Evaluation by Meilgaard et al 2007)(Immediately post-drink (1 minute post-drink))
- Stroop test(Immediately pre- (2 hours post-drink) and immediately post-exercise (2.5 hours post drink))
- Salivary nitrate(Pre-drink, 2 hours post-drink and immediately post-exercise (2.5 hours post-drink))
- Muscle oxygenation(During exercise (2-2.5 hours post drink))
研究者
Stephen Burns
Associate Professor
Nanyang Technological University