Scientific Reports · 8 authors, 6 centres
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Nineteen participants received sodium bicarbonate (0.4 g·kg⁻¹) plus 15 g carbohydrate in a randomized double-blind placebo-controlled trial and performed repeated 15-second Wingate anaerobic tests. Peak blood bicarbonate increased by 7.8±1.9 mmol·L⁻¹ at 75 minutes post-ingestion, but gastrointestinal side effects inversely interacted with performance indices, and no significant difference in performance was found between the sodium bicarbonate and placebo conditions.
Nineteen recreationally active participants completed a randomized double-blind placebo-controlled crossover trial comparing sodium bicarbonate (0.4 g·kg⁻¹) co-ingested with 15 g carbohydrate, a matched placebo plus carbohydrate, and a no-supplement control. Following ingestion, participants performed six repeated 15-second Wingate anaerobic tests with 30-second rest intervals. Mean peak blood bicarbonate reached its highest level 75 minutes post-ingestion, with a mean increase of 7.8±1.9 mmol·L⁻¹ from baseline. Although there was a significant main effect between conditions for peak power, this lost significance when treatment order or gender was included in the models. Gastrointestinal side effects were substantially higher with sodium bicarbonate plus carbohydrate and placebo plus carbohydrate compared to control, and there was an inverse interaction between gastrointestinal side effects and performance indices with sodium bicarbonate. No significant associations were observed between the level of blood bicarbonate elevation and Wingate test performance.
