Sodium bicarbonate, commonly known as baking soda, buffers lactic acid buildup in muscles during high-intensity exercise, allowing athletes to maintain pace longer before fatigue sets in. Research shows the compound can improve performance in efforts lasting 1-10 minutes, with benefits most pronounced in repeated sprint activities and middle-distance running.
The mechanism is straightforward: intense exercise produces hydrogen ions that lower muscle pH and trigger fatigue. Bicarbonate neutralizes these ions, delaying the point where muscles can no longer contract effectively. Studies demonstrate performance gains of 2-3 percent for trained athletes taking 0.3 grams per kilogram of body weight 60-90 minutes before exercise.
The catch lies in gastrointestinal distress. Sodium bicarbonate is a salt that draws water into the digestive tract, causing bloating, nausea, and diarrhea in many athletes. The effect intensifies during running, when blood diverts from the stomach to working muscles. Individual tolerance varies dramatically based on genetics, training status, and stomach sensitivity.
Proper timing and dosing reduce side effects. Taking bicarbonate with food, spacing doses across 15-20 minutes, and consuming it with 300-500 milliliters of water helps. Starting with smaller doses during training runs reveals individual tolerance before race day. Some athletes benefit from enteric-coated versions designed to dissolve lower in the digestive tract.
The ergogenic effect applies specifically to efforts where lactate accumulation limits performance. Distance runners tackling tempo work or 5K races see the most benefit. Ultramarathoners and purely aerobic efforts show minimal gains. Athletes with acid reflux or irritable bowel syndrome should avoid the supplement entirely.
For those considering sodium bicarbonate, the protocol is clear: test during training, time the dose carefully, and pair it