Purpose <p>This study aimed to investigate the effects of sodium bicarbonate (NaHCO₃) on upper-body intermittent strength endurance performance in male Brazilian Jiu-Jitsu (BJJ) athletes.</p> Methods <p>Using a double-blind, placebo-controlled crossover design, twelve BJJ athletes performed an upper-body intermittent strength endurance protocol (four sets of judogi dynamic strength endurance test, interspersed by 3-min recovery intervals) 90&#xa0;min after ingesting either NaHCO₃ (0.3&#xa0;g·kg⁻¹ of body mass) or placebo (calcium carbonate). The primary outcome was the number of repetitions performed during the intermittent strength endurance protocol, whereas maximal isometric handgrip strength, heart rate (HR), and ratings of perceived exertion (RPE) were assessed as secondary outcomes.</p> Results <p>NaHCO₃ did not improve the number of repetitions per bout during the test or the maximal isometric handgrip strength compared to placebo (<i>p</i> &gt; 0.05). The ratings of perceived exertion (RPE) and heart rate (HR) increased linearly throughout the test (<i>p</i> &lt; 0.05), but there were no significant differences between the NaHCO₃ and placebo conditions (<i>p</i> &gt; 0.05).</p> Conclusion <p>Acute ingestion of NaHCO₃ did not improve performance in short-duration upper-body intermittent tasks in BJJ athletes.</p>