Single sodium bicarbonate dose to improve 200 m Bi‑Fins performance in national finswimmers

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This randomized, double‑blind, placebo‑controlled crossover trial enrolls 20 members of the Czech junior or senior national finswimming teams to compare a single dose of sodium bicarbonate (300 mg·kg⁻¹) versus placebo and a no‑intervention control. Each participant completes three test sessions (control, bicarbonate, placebo) separated by 48 hours without training, with sessions conducted under standardized conditions in a 25‑meter indoor pool. Primary measures include 200‑meter time, stroke biomechanics (stroke rate and stroke length), and selected physiological and perceptual responses including repeated blood sampling for acid‑base balance. Capsules are indistinguishable and allocation is concealed so participants and investigators are blinded to supplement condition.

Why it matters

Who can join: the full rules

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)

Where it's running

• Palacký University, Faculty of Physical Culture
  Olomouc, Olomouc Region, Czechia Recruiting

Study contacts

• Principal investigator: Tomáš Michalica, Mgr. — Palacký University, Faculty of Physical Culture
• Study coordinator: Tomáš Michalica, Mgr.
• Email: tomas.michalica01@upol.cz
• Phone: +420605320688

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.