Key Takeaway
Sodium bicarbonate significantly improves cycling time-trial performance, with effects most pronounced in events lasting 1-10 minutes.
Summary
This systematic review and meta-analysis evaluated the acute effects of sodium bicarbonate supplementation on cycling time-trial performance. The analysis focused specifically on randomized controlled trials using cycling time trials as the performance outcome, providing sport-specific evidence for cyclists and coaches.
The pooled analysis found that sodium bicarbonate ingestion significantly improved cycling time-trial performance compared to placebo. The ergogenic effect was most pronounced in shorter, high-intensity time trials where anaerobic metabolism and acid-base balance play crucial roles in performance.
These findings provide strong, cycling-specific evidence supporting sodium bicarbonate as an effective ergogenic aid for competitive cyclists, particularly in events like individual pursuits, team pursuits, and short road time trials where high power output must be sustained for 1-10 minutes.
Methods
- Systematic literature search of major databases
- Included only randomized controlled trials
- Focused on cycling time-trial performance outcomes
- Meta-analysis using random-effects model
- Assessed study quality and risk of bias
- Subgroup analyses by time-trial duration and dosing protocol
Key Results
- Significant overall improvement in time-trial performance with sodium bicarbonate
- Effects were larger for shorter duration trials (1-4 minutes)
- Standard dosing (0.3 g/kg) showed consistent benefits
- Mean improvement in power output and completion time
- Low to moderate heterogeneity across studies
- Consistent benefit direction across included trials
Limitations
- Heterogeneity in time-trial protocols (duration, intensity)
- Variable timing of supplementation relative to exercise
- Most studies used trained cyclists, limiting generalizability
- GI side effects not consistently reported across studies
- Limited data on individual response variability
- Publication bias possible despite assessment efforts