03/11/2026
CAN SODIUM BICARBONATE MAKE YOU A FASTER 10K RUNNER?
Sodium bicarbonate is traditionally associated with middle-distance running and high-intensity exercise.
However, new research has investigated whether it can also improve 10km performance.
And the results are interesting.
The study
21 recreational female runners completed two 10km outdoor track time trials
On one occasion, they consumed sodium bicarbonate. On the other, a placebo.
The protocol involved:
* 0.3g per kg of body mass.
* Consumed 90 minutes before running.
* Alongside a carbohydrate-rich meal (1.5g/kg).
Findings
Average 10km times:
🔹 Placebo: 51:18
🔹 Sodium bicarbonate: 50:46
That’s an average improvement of 32 seconds (1.05%).
Interestingly, there was no significant difference in overall gastrointestinal symptom scores between conditions.
The menstrual cycle
The researchers matched both trials to the same phase of each participant’s menstrual cycle.
This helps reduce the likelihood that cycle-related differences influenced the comparison.
It’s encouraging to see female-specific physiological considerations being incorporated into sports performance research.
Why could this work
Sodium bicarbonate acts as an extracellular buffering agent.
During high-intensity exercise, hydrogen ions accumulate and contribute to fatigue.
Increasing blood bicarbonate availability can improve the body’s ability to buffer hydrogen ions, potentially helping athletes sustain high-intensity exercise.
How does this apply to runners?
The findings are promising, particularly given the intensity required to race 10km.
However, this was a relatively small study involving recreational female runners. We cannot assume the same improvements will occur in men, elite athletes or every individual.
Sodium bicarbonate can also cause gastrointestinal problems, so it’s certainly not something to experiment with for the first time on race day.
Takeaways
Sodium bicarbonate is an interesting evidence-based performance supplement with potential applications beyond middle-distance running.
Research: Aktitiz et al. (2026), International Journal of Sport Nutrition and Exercise Metabolism.