Evaluation of the Effects of Single Sodium Bicarbonate Supplementation on Finswimming Performance of National Level Finswimmers: A Randomized, Double-Blind, Placebo-Controlled Crossover Study
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 20
- 试验地点
- 1
- 主要终点
- Stroke rate (SR; cycles/min)
研究概览
简要总结
This randomized, double-blind, placebo-controlled crossover trial will investigate the acute effects of sodium bicarbonate supplementation on performance, stroke biomechanics, and selected physiological and perceptual responses during a simulated 200-meter Bi-Fins race in elite finswimmers.
详细描述
This randomized, double-blind, placebo-controlled, crossover study will examine the effects of sodium bicarbonate (NaHCO₃) supplementation on simulated finswimming performance and associated biomechanical, physiological, and perceptual responses in national-level finswimmers. Twenty participants, all active members of the Czech junior or senior national team, will complete three test sessions separated by a 48-hour recovery period without training sessions.
The first session will serve as a control with no intervention, while the second and third will involve ingestion of either sodium bicarbonate (NaHCO₃; 300 mg·kg-¹) or placebo (food-grade starch), administered in a randomized, counterbalanced order. The capsules will be indistinguishable in appearance, weight, and texture. Allocation concealment will be ensured: only a designated medical professional overseeing the health and safety of the participants will have access to the randomization codes. Neither the participants nor the investigators will be aware of the supplement condition during testing.
All sessions will be conducted under standardized conditions in a 25-meter indoor swimming pool (Aplikační centrum BALUO, Palacký University Olomouc) and will include a standardized warm-up followed by a 200-meter Bi-Fins time trial.
Blood samples for acid-base balance assessment will be collected at four time points: baseline (10 minutes before warm-up), 10 minutes after warm-up, 5 minutes before race start, and 3 minutes post-exercise. From these samples, variability in acid-base balance will be assessed, specifically using actual base excess (ABE; mmol/L), blood hydrogen ion concentration (pH; unitless), and bicarbonate concentration (HCO₃-; mmol/L). Blood lactate concentration (mmol/L) will be measured at two time points only: baseline (10 minutes before warm-up) and 3 minutes post-exercise.
Subjective perceptual responses will include:
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
- Triple (Participant, Care Provider, Investigator)
入排标准
- 年龄范围
- 15 Years 至 30 Years（Child, Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Member of a wider national selection in finswimming (junior or senior level)
- •Regular participation in competitive finswimming training (≥4 sessions per week)
- •Age between 15 and 30 years
- •Absence of chronic illness or injury
- •No use of medications or dietary supplements during the study period
- •Signed informed consent (for minors, also signed by a legal guardian)
排除标准
- •History of gastrointestinal disorders affecting supplement tolerance
- •Presence of cardiovascular, metabolic, or musculoskeletal disorders
- •Current illness or acute infection
- •Regular use of substances that may interfere with acid-base balance
- •Refusal to comply with pre-test restrictions (e.g., 48 hours without training)
结局指标
主要结局
Stroke rate (SR; cycles/min)
时间窗: Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.
Calculated from video analysis to determine the number of stroke cycles per minute.
Total race time (seconds)
时间窗: Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.
Total time to complete the 200-meter Bi-Fins time trial, measured using an electronic timing system. Lower values indicate better performance.
Stroke length (SL; meters/cycle)
时间窗: Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.
Calculated from video analysis to determine the average distance traveled per stroke cycle.
次要结局
- Underwater distance (meters)(Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.)
- Blood lactate concentration (mmol/L)(Baseline (10 minutes before warm-up) and 3 minutes post-exercise on each testing day)
- Actual base excess (ABE; mmol/L)(Baseline (10 minutes before warm-up), 10 minutes after warm-up, 5 minutes before race start, and 3 minutes post-exercise on each testing day)
- Blood bicarbonate concentration (HCO₃-; mmol/L)(Baseline (10 minutes before warm-up), 10 minutes after warm-up, 5 minutes before race start, and 3 minutes post-exercise on each testing day)
- Rate of Perceived Exertion (RPE; score on Borg Category Ratio 1-10 scale)(Immediately post-exercise on each testing day)
- Gastrointestinal discomfort (score on Borg Category Ratio 1-10 scale)(Approximately 5 minutes before race start on each testing day)
- Delayed-onset muscle soreness (DOMS; score on 10-centimeter visual analog scale)(Immediately post-exercise on each testing day)
- Underwater time (seconds)(Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.)
- Underwater velocity (meters/second)(Measured from video analysis of the 200-m Bi-Fins trial; final values reported at race completion on Day 1, Day 3, and Day 5.)
- Blood hydrogen ion concentration (pH; unitless)(Baseline (10 minutes before warm-up), 10 minutes after warm-up, 5 minutes before race start, and 3 minutes post-exercise on each testing day)
研究者
Tomáš Michalica
Principal Investigator, Doctoral Researcher and Assistant Lecturer, Faculty of Physical Culture, Palacký University Olomouc
Palacky University