Placebo: Gelatin capsules each containing 1g food-grade starch
Study summary
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.
Eligibility
Sex
ALL
Min age
15 Years
Max age
30 Years
Healthy volunteers
Accepted
Inclusion Criteria:
1. Member of a wider national selection in finswimming (junior or senior level)
2. Regular participation in competitive finswimming training (≥4 sessions per week)
3. Age between 15 and 30 years
4. Absence of chronic illness or injury
5. No use of medications or dietary supplements during the study period
6. Signed informed consent (for minors, also signed by a legal guardian)
Exclusion Criteria:
1. History of gastrointestinal disorders affecting supplement tolerance
2. Presence of cardiovascular, metabolic, or musculoskeletal disorders
3. Current illness or acute infection
4. Regular use of substances that may interfere with acid-base balance
5. Refusal to comply with pre-test restrictions (e.g., 48 hours without training)
Primary outcome measure(s)
Stroke rate (SR; cycles/min) — 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) — 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) — 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.
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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