BiCarb for Cycling: How Sodium Bicarbonate Improves Sprint Power

You train for months. You dial in your nutrition, your cadence, your positioning. And then, in the final 90 seconds of a criterium or the closing sprint of a road stage, your legs flood with acid, your power drops, and the rider on your wheel goes past you.

That burning sensation is the result of hydrogen ion accumulation in your working muscles—a byproduct of the anaerobic glycolysis your body relies on during maximal efforts. It is one of the key mechanisms that limits sprint performance in cycling. And it is precisely the problem that sodium bicarbonate supplementation is designed to address.

Sodium bicarbonate (NaHCO₃) is one of the most extensively researched ergogenic aids in sports science. The International Society of Sports Nutrition (ISSN) has confirmed that supplementation with sodium bicarbonate improves performance in high-intensity cycling, running, swimming, and rowing, with the most robust evidence for efforts lasting between 30 seconds and 12 minutes (Grgic et al., 2021). For cyclists, this encompasses some of the most decisive moments in competition: the final sprint, the bridge to a breakaway, the time trial, and the surge over a short climb.

This guide explains the physiology behind bicarb cycling supplementation, reviews the evidence for its effects on sprint power, and provides a practical protocol so you can integrate it into your race-day preparation with confidence—and without the gastrointestinal distress that has historically held athletes back.

How Does Sodium Bicarbonate Work in Cycling?

To understand why sodium bicarbonate cycling supplementation is effective, it helps to understand what limits your sprint in the first place.

During high-intensity efforts above your lactate threshold, your muscles produce energy through anaerobic glycolysis at an accelerated rate. This process generates lactate and, critically, hydrogen ions (H⁺). As H⁺ accumulates in the muscle cell, intracellular pH drops—a state known as metabolic acidosis. This declining pH impairs muscle contraction by interfering with calcium release, reducing the activity of key glycolytic enzymes, and diminishing muscle excitability (Allen et al., 2008; Fitts, 2016).

Your body has a natural defence against this: the bicarbonate buffering system. Bicarbonate ions (HCO₃⁻) circulating in your blood neutralise excess H⁺ ions by combining with them to form carbonic acid, which is then expelled as carbon dioxide through your lungs. However, during maximal or near-maximal efforts, your body’s endogenous bicarbonate stores are insufficient to keep pace with H⁺ production.

Supplementing with sodium bicarbonate before exercise increases the concentration of HCO₃⁻ in your blood, creating a greater pH gradient between the intracellular environment (where H⁺ is accumulating) and the extracellular fluid. This gradient accelerates the efflux of H⁺ out of the muscle cell, maintaining intracellular pH closer to optimal levels and delaying the onset of fatigue.

In practical terms: you can sustain a higher power output for longer before your muscles give out.

What Does the Research Say About Bicarb and Cycling Sprint Performance?

The evidence for sodium bicarbonate’s ergogenic effects in cycling is substantial, though it is important to understand where the benefits are most pronounced.

Sprint Performance After Endurance Riding

One of the most cycling-specific studies was conducted by Dalle et al. (2021) at KU Leuven. Eleven trained male cyclists (VO₂max ≥ 55 mL/kg/min) completed a protocol simulating a road race: 2.5 hours of steady-state cycling followed by a 90-second all-out sprint. Those who ingested 0.3 g/kg body mass of sodium bicarbonate prior to the ride produced approximately 3% more power during the closing sprint compared to placebo.

A 3% improvement may sound modest on paper, but in competitive cycling it is transformative. In a field sprint, 3% is the difference between sitting in the bunch and being on the podium. It is the margin between holding a wheel through the final corner and being gapped.

Repeated Time Trial Efforts

Gough et al. (2024) examined the effects of a novel sodium bicarbonate delivery system on repeated 4 km cycling time trials in well-trained male cyclists. The study found that sodium bicarbonate significantly improved performance across repeated efforts, with faster times in the second time trial compared to both placebo and control conditions. Crucially, the acid–base recovery between bouts was significantly accelerated, meaning athletes could reproduce high-intensity efforts more effectively.

Hilton et al. (2020) also demonstrated that enteric-coated sodium bicarbonate improved 4 km cycling time trial performance by approximately 8.5 seconds compared to placebo, while simultaneously reducing the incidence of gastrointestinal symptoms.

The Umbrella View

An umbrella review of meta-analyses by Grgic et al. (2021), published in the British Journal of Sports Medicine, concluded that sodium bicarbonate supplementation acutely enhances peak anaerobic power, anaerobic capacity, and performance in endurance events lasting approximately 45 seconds to 8 minutes. The pooled effect sizes ranged from 0.36 to 0.40 for the most relevant cycling outcomes—a meaningful ergogenic effect supported by moderate-to-high quality evidence.

These are not marginal or theoretical gains. They are replicated, peer-reviewed, and directly applicable to the demands of competitive cycling.

How Much Sodium Bicarbonate Should I Take Before Cycling?

The optimal dose is 0.2 to 0.3 g per kilogram of body weight, taken as a single acute dose. The ISSN position stand confirms this range as the most effective for improving exercise performance (Grgic et al., 2021).

For a 70 kg cyclist, this equates to 14–21 grams of sodium bicarbonate. For a 55 kg cyclist, the range is 11–16.5 grams.

The higher end of this range (0.3 g/kg) has been used in the majority of studies demonstrating significant performance improvements, including the Dalle et al. sprint study and the Hilton et al. time trial research. However, the higher dose also carries a greater risk of gastrointestinal side effects when taken in raw or standard capsule form—which is exactly why the delivery mechanism matters.

Use the BiCarb Plus Dosage Calculator to find your personalised dose based on your body weight

When Should I Take Sodium Bicarbonate Before a Race?

Timing is as important as dosage. The goal is to time your intake so that you begin exercise at or near your individual peak blood bicarbonate concentration.

Research indicates that peak blood bicarbonate typically occurs 60 to 180 minutes after ingestion, depending on the individual and the form of supplementation. Standard oral sodium bicarbonate (in solution or gelatin capsules) tends to peak between 60 and 90 minutes. Enteric-coated and encapsulated delivery systems may take longer—often 120 to 180 minutes—but offer the advantage of significantly reduced GI symptoms during the critical pre-race window.

The practical recommendation: take your dose 2 to 3 hours before your event, with 500 mL of water and ideally alongside a carbohydrate-rich meal or snack. The carbohydrate co-ingestion has been shown to further reduce the likelihood and severity of GI distress (Carr et al., 2011).

If you are new to bicarb loading, always trial your protocol in training first. Individual responses vary, and finding your optimal timing window is part of building an effective race-day ritual.

Why Do Athletes Avoid Sodium Bicarbonate—And How Has That Changed?

The single biggest barrier to sodium bicarbonate adoption among cyclists is fear of gastrointestinal distress. And historically, that fear has been well-founded.

Raw sodium bicarbonate—yes, essentially baking soda dissolved in water—reacts immediately with stomach acid, producing carbon dioxide gas and causing bloating, nausea, cramping, and in severe cases, osmotic diarrhoea. Studies have consistently reported that a significant proportion of athletes experience moderate-to-severe GI symptoms when taking standard sodium bicarbonate at ergogenic doses. Research by Hilton et al. (2019) found that up to 60–70% of participants experienced some degree of GI discomfort with standard gelatin capsules.

This is where advances in delivery technology have changed the equation. Enteric-coated and encapsulated sodium bicarbonate formulations are designed to resist dissolution in the acidic environment of the stomach. Instead, the bicarbonate passes through to the small intestine, where it is absorbed into the bloodstream without triggering the gastric distress that has historically plagued athletes.

Hilton et al. (2020) demonstrated that enteric-coated capsules significantly reduced GI symptom severity compared to gelatin capsules (2.8 vs. 7.0 on a 10-point arbitrary unit scale), while still achieving the blood alkalosis needed for performance benefits. Gough and Sparks (2024) reported that a hydrogel-based mini-tablet system reduced aggregated GI discomfort scores dramatically compared to traditional capsules (9 vs. 85 arbitrary units).

The science is clear: you no longer have to choose between performance and your stomach.

Read our full guide → “BiCarb Plus Welcome Guide”

Which Cycling Disciplines Benefit Most from Bicarb Loading?

Not all cycling events place the same demands on your anaerobic energy system. The benefits of sodium bicarbonate cycling supplementation are most pronounced in disciplines where high-intensity, glycolytically demanding efforts determine the outcome.

Criterium Racing

Criteriums are defined by repeated surges, accelerations out of corners, and a decisive final sprint. Every one of these efforts drives H⁺ accumulation, and the ability to recover between surges is directly supported by elevated blood bicarbonate. Bicarb loading is arguably most beneficial in this format.

Time Trials (Short to Medium Distance)

Events lasting 4 to 20 minutes—the kind of time trial you encounter in a prologue or a club championship—sit squarely in the duration range where sodium bicarbonate has the strongest evidence base. These efforts are sustained at or above threshold, precisely where buffering capacity becomes a performance limiter.

Road Racing Sprints and Surges

Even in a long road race, the decisive moments—the sprint finish, the attack on a climb, the chase to bridge a gap—are anaerobic. The Dalle et al. (2021) study specifically demonstrated that bicarb supplementation improves sprint power at the end of a prolonged endurance effort, which directly mirrors the demands of road racing.

Track Cycling

Individual and team pursuits, scratch races, and points races all involve maximal or near-maximal efforts in the 1- to 4-minute range. This is the physiological sweet spot for sodium bicarbonate supplementation.

Can I Combine Sodium Bicarbonate with Other Supplements?

Yes, and in some cases, the combination may produce additive benefits.

The ISSN position stand notes that combining sodium bicarbonate with creatine or beta-alanine may produce additive effects on performance, as these supplements target different aspects of the fatigue process. Creatine supports the phosphagen system (efforts under 10 seconds), beta-alanine enhances intracellular buffering via carnosine synthesis, and sodium bicarbonate enhances extracellular buffering. Together, they provide a comprehensive buffering strategy.

The evidence for combining sodium bicarbonate with caffeine is mixed. Some studies suggest an additive benefit, while others show no additional improvement beyond what either supplement provides alone. If you use caffeine as part of your race-day protocol, there is no evidence that it interferes with bicarb’s effects, so the two can be used concurrently.

How Do I Build a BiCarb Loading Protocol for Race Day?

Here is a practical, evidence-based protocol for integrating sodium bicarbonate into your cycling race preparation:

Step 1: Determine Your Dose. Use the 0.2–0.3 g/kg body weight range. Start at 0.2 g/kg if you are new to bicarb loading. The BiCarb Plus Dosage Calculator at bicarbplus.com.au can generate your personalised recommendation based on your body weight and event type.

Step 2: Time Your Intake. Take your dose 2–3 hours before your event start time. Consume with at least 500 mL of water and a carbohydrate-containing snack or meal.

Step 3: Trial in Training. Never debut your protocol on race day. Use a high-intensity training session—a set of threshold intervals or a practice time trial—to test your tolerance and timing.

Step 4: Use an Advanced Delivery System. The research is unambiguous: encapsulated and enteric-coated formulations dramatically reduce GI side effects while maintaining full ergogenic efficacy. This is not optional—it is the difference between a protocol you can trust and one that is a gamble.

Step 5: Make It a Ritual. The most effective supplementation is the kind you do consistently. Build your bicarb loading into your pre-race routine alongside your warm-up, your nutrition, and your equipment check.

The Bottom Line: Sodium Bicarbonate Is a Proven Edge for Cyclists

The evidence for bicarb cycling supplementation is not speculative. It is grounded in decades of peer-reviewed research, validated by the ISSN and the IOC, and demonstrated in cycling-specific studies with trained athletes.

Sodium bicarbonate improves sprint power at the end of endurance rides. It accelerates recovery between repeated high-intensity efforts. It enhances time trial performance. And with modern encapsulated delivery systems, it does all of this without the gastrointestinal distress that once made it impractical for race-day use.

For cyclists who are serious about performance—whether you are racing criteriums, chasing Strava KOMs, or preparing for a national championship—sodium bicarbonate supplementation is one of the few legal, evidence-based tools that can deliver a genuine, measurable advantage when it matters most.

 

Use the BiCarb Plus Dosage Calculator to get your personalised loading protocol based on your body weight and event type. Then explore the BiCarb Plus system—Australian-made, HASTA-pathway certified, and designed for athletes who refuse to compromise between performance and comfort.

→ Visit bicarbplus.com.au

 

References

Allen, D.G., Lamb, G.D., & Westerblad, H. (2008). Skeletal muscle fatigue: cellular mechanisms. Physiological Reviews, 88(1), 287–332.

Carr, A.J., Slater, G.J., Gore, C.J., Dawson, B., & Burke, L.M. (2011). Effect of sodium bicarbonate on [HCO₃⁻], pH, and gastrointestinal symptoms. International Journal of Sport Nutrition and Exercise Metabolism, 21(3), 189–194.

Dalle, S., Koppo, K., & Hespel, P. (2021). Sodium bicarbonate improves sprint performance in endurance cycling. Journal of Science and Medicine in Sport, 24(3), 301–306.

Fitts, R.H. (2016). The role of acidosis in fatigue: pro perspective. Medicine & Science in Sports & Exercise, 48(11), 2335–2338.

Gough, L.A., & Sparks, S.A. (2024). The effects of a novel sodium bicarbonate ingestion system on repeated 4 km cycling time trial performance in well-trained male cyclists. Sports Medicine, 54(12), 3199–3210.

Grgic, J., Pedisic, Z., Saunders, B., Artioli, G.G., Schoenfeld, B.J., McKenna, M.J., Bishop, D.J., Kreider, R.B., Stout, J.R., Kalman, D.S., Arent, S.M., VanDusseldorp, T.A., Lopez, H.L., Ziegenfuss, T.N., Burke, L.M., Antonio, J., & Campbell, B.I. (2021). International Society of Sports Nutrition position stand: sodium bicarbonate and exercise performance. Journal of the International Society of Sports Nutrition, 18(1), 61.

Grgic, J., Rodriguez, R.F., Garofolini, A., Bishop, D.J., & Pedisic, Z. (2021). Effects of sodium bicarbonate supplementation on exercise performance: an umbrella review. British Journal of Sports Medicine, 56(4), 247–255.

Hilton, N.P., Leach, N.K., Hilton, M.M., Sparks, S.A., & McNaughton, L.R. (2020). Enteric-coated sodium bicarbonate supplementation improves high-intensity cycling performance in trained cyclists. European Journal of Applied Physiology, 120(7), 1563–1573.

Hilton, N.P., Leach, N.K., Sparks, S.A., & McNaughton, L.R. (2019). Enteric-coated sodium bicarbonate attenuates gastrointestinal side-effects. International Journal of Sport Nutrition and Exercise Metabolism, 30(1), 41–48.