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.
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
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