The Effects of Sodium Bicarbonate Supplementation on Intense Exercise Performance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 12
- 试验地点
- 2
- 主要终点
- Peak power output
研究概览
简要总结
This was a randomized, double-blind, placebo controlled, crossover trial. The study aimed to assess the effect of sodium bicarbonate on the ability to perform a repeated sprint task by female football players. The researches hypothesis was that sodium bicarbonate increases the ability to remove lactic acid from muscle cells reducing its intracellular accumulation and increasing energetic efficiency resulting in the increase of peak power output, mean power output, or total work or in the decrease of the sprint decrement in each set of the repeated sprints task.
详细描述
Experimental design: The study consisted of a randomized, double-blind, controlled, crossover trial where 11 female football players performed, in a randomized order, two repeated sprints tasks in a cycle ergometer, after having ingested either sodium bicarbonate (SB) or placebo (PL). Body composition of the athletes was characterized by bioelectrical impedance analysis with a single frequency (50 kHz) device (BIA 101 Anniversary, Akern, Florence, Italy) before the exercise sessions. Data collection was separated by a period of at least one week within a period of time not exceeding one month and performed at the same time of the day for each participant. Data regarding performance, blood lactate accumulation, pulmonary gas exchange, heart rate (HR), muscle oxygenation and neuromuscular fatigue were collected during these two sessions.
Supplementation protocol: The participants ingested capsules containing 0.3 g/kg of body weight of SB or cellulose as PL divided into two doses. The first intake (0.2 g/kg) occurred 2 h before the beginning of the protocol, and the second (0.1 g/kg) occurred 1 h later. Possible gastrointestinal symptoms associated with supplement ingestion were controlled with a questionnaire based on the questionnaire applied by Miller et al. (2016).
Repeated sprints protocol: The RSA protocol was performed in a cycle ergometer (Monark Ergomedic 894 E, Monark Exercise AB, Vansbro, Sweden) and was composed of 3 sets of 6 sprints with 6 s duration with a workload of 4% of the body mass. Repetitions were separated by 24 s of active recovery, and participants were conceded 5 min of passive recovery to rest between sets. The protocol was preceded by a 5-min warm-up in which athletes pedalled at a speed of 60 to 70 rpm.
Performance Measurements: Performance was evaluated by monitoring peak power output, mean power output, total work and the sprint decrement in each set of the two repeated sprints task.
Blood lactate accumulation: Lactate concentration was assessed (Lactate Pro 2, KDK Corporation, Kyoto, Japan) in capillary blood from the ear lobe before the beginning of each protocol, 1 min after the end of each set, and at min 1 and every 2 min after the tasks were completed, until the value started to decrease. At the end of the tasks, the maximal values achieved were considered for analysis.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Football players
- •Regularly training with a weekly microcycle consisting of 3 to 5 training sessions and 1 game at the weekend
- •Able to provide informed consent
排除标准
- •Injury occurrence in the month previous to data collection
- •Ergogenic supplements consumption in the month previous to data collection
- •Having known intolerance to sodium bicarbonate
结局指标
主要结局
Peak power output
时间窗: 3 minutes through each set of the repeated sprints tasks
Watt
Sprint Decrement
时间窗: 3 minutes through each set of the repeated sprints tasks
percentage of power decrease
Mean power output
时间窗: 3 minutes through each set of the repeated sprints tasks
Watt
Total Work
时间窗: 3 minutes through each set of the repeated sprints tasks
Joule
次要结局
- Changes in muscle deoxygenated haemoglobin(3 minutes through each set of the repeated sprints tasks)
- Oxygen uptake(3 minutes through each set of the repeated sprints tasks)
- Heart rate(3 minutes through each set of the repeated sprints tasks)
- Lactate accumulation(Before the repeated sprints tasks, between sets of the repeated sprints tasks, immediatly after the repeated sprints tasks, 2 minutes after the repeated sprints tasks)
- carbon dioxide production(3 minutes through each set of the repeated sprints tasks)
- Ventilation(3 minutes through each set of the repeated sprints tasks)
- Countermovement jump height(Before and after each repeated sprints tasks)
- Changes in muscle oxygenated haemoglobin(3 minutes through each set of the repeated sprints tasks)
研究者
Cristina Monteiro
Assistant Professor
Faculdade de Motricidade Humana