How Pre-Training Beetroot Juice Can Improve Sprint Repeats and Cycling Economy
Beetroot juice can improve repeated sprint performance and lower the oxygen cost of submaximal work. Here’s the dose, timing, and protocol that actually works.
If you have a hard interval session tomorrow and want the best shot at keeping power high from rep 1 to rep 12, beetroot juice is one of the few legal nutrition tools that can meaningfully move the needle. In trained athletes, nitrate-rich beetroot juice can reduce the oxygen cost of submaximal exercise and improve high-intensity performance, especially when the session depends on repeated efforts and not just one all-out sprint (Jones, 2014; Senefeld et al., 2020).
What beetroot juice is actually doing Beetroot juice is rich in inorganic nitrate. Nitrate is converted in the body to nitrite and then nitric oxide, especially when oxygen availability drops and exercise intensity rises. Nitric oxide helps improve blood flow, muscle contractility, and the efficiency of oxidative metabolism, which is why athletes often see a small but real performance boost rather than a dramatic feeling of being “amped” (Larsen et al., 2007; Jones, 2014).
The practical outcome is simple: for the same external workload, you may burn a bit less oxygen, delay fatigue slightly, and sustain power better across repeated bouts. That matters most in sports and sessions built around hard intervals, short recoveries, surges, and pace changes.
The best-supported performance effects The clearest benefit of beetroot juice is on exercise economy. In cycling, running, and rowing studies, nitrate supplementation can reduce the oxygen cost of submaximal exercise by a small but meaningful amount, often enough to improve time-trial performance or make steady hard efforts feel more controllable (Lansley et al., 2011; Jones, 2014).
For repeated-sprint ability, the effect is more variable but still useful. Some athletes show better total work, faster maintenance of sprint power, or less performance drop-off across a sprint series, especially when the protocol includes short recovery periods and a high aerobic contribution to resynthesis between efforts (Coggan and Coyle, 2010; Senefeld et al., 2020). In plain terms: beetroot juice does not turn you into a different athlete, but it can help you protect output when fatigue usually starts compounding.
Session quality is the underrated benefit. Even when lab performance changes are modest, athletes often report being able to hold target power, complete more high-quality reps, or finish the session with less dead-legged decay. That can improve training density across a week, which is where the real value accumulates.
Who responds best Not everyone responds equally. The best responders tend to be less highly trained athletes, athletes with lower baseline nitrate intake, and people doing aerobic or mixed-modality work with a clear endurance component (Wilkerson et al., 2012; Senefeld et al., 2020). Highly trained endurance athletes still benefit, but the average effect is usually smaller because their physiology is already very adapted.
You may also get more benefit when the session is long enough for efficiency to matter or intense enough that repeated-sprint fatigue is the limiter. If your workout is a single 5-second max lift or a pure alactic sprint with full recovery, beetroot juice is less likely to help. If your workout is 8 x 30-second hard intervals, 6 x 1-minute surges, or a race with frequent pace changes, the odds improve.
The dose that works The most practical target is 5 to 9 mmol of nitrate, which is roughly 300 to 600 mg nitrate, taken from concentrated beetroot juice shots (Jones, 2014; Senefeld et al., 2020). Many commercial shots list nitrate content on the label; use that number, not the bottle size.
A solid protocol:
- Take 1 shot containing 5 to 8 mmol nitrate
- Dose 2 to 3 hours before training or competition
- Use it on key sessions, not every day
If you are testing your tolerance, start at the low end: about 5 mmol. If you want to explore a bigger effect before an important event, move toward 8 to 9 mmol, but more is not automatically better. Past that range, benefits flatten and gastrointestinal risk rises.
Timing matters more than people think Peak plasma nitrite generally occurs around 2 to 3 hours after ingestion, which is why “right before I warm up” is often too late for best effect (Jones, 2014). If you train early, take the shot immediately after waking, then warm up normally and start the main work window 2 to 3 hours later if possible.
For evening sessions, the same rule applies. If your key interval block starts at 6 p.m., take the shot around 3 to 4 p.m.
There is also a useful loading strategy. Some studies use 3 to 7 days of daily nitrate intake before competition, which can help if you want a more reliable effect or you have an event day that is difficult to standardize (Senefeld et al., 2020). A simple loading plan is 1 shot per day for 3 days before your event, then one final shot 2 to 3 hours pre-session.
What it helps most: repeated sprints and cycling economy Repeated-sprint ability improves when the bottleneck is not just raw alactic power but the ability to recover between efforts and keep producing near-maximal output. Nitrate appears to help by improving muscle efficiency and possibly improving the balance of ATP resynthesis pathways during intermittent work (Jones, 2014; Senefeld et al., 2020).
For cyclists, the value is especially clear. Lower oxygen cost at submaximal power means a given threshold or tempo workload may become easier to sustain, and the final stages of long intervals or time trials may be more manageable (Lansley et al., 2011). That can show up as less fade in the final 10 to 15 minutes of a session or better completion of prescribed power targets.
For runners and hybrid athletes, the same logic applies, but the effect is often easiest to notice in fartlek, hill repeats, shuttle runs, or mixed modal conditioning where fatigue accumulates through repeated changes of pace.
How to make it work in real life Do not treat beetroot juice like a magical pre-workout. It is a precision tool. The athlete who benefits most is the one who uses it on the right sessions and combines it with enough carbohydrate, hydration, and a sensible warm-up.
Use it when the goal is one of the following:
- Protect power across intervals
- Improve time-trial or threshold work
- Improve repeated-sprint consistency
- Increase session quality when fatigue is already high
Do not expect much if:
- The workout is a single maximal lift
- You already had a high-nitrate meal and the session is low priority
- You take it and then do a session after only 20 minutes
Common mistakes that ruin the effect The biggest mistake is using antibacterial mouthwash or chewing gum that suppresses oral bacteria. The nitrate-to-nitrite conversion starts in the mouth, and disrupting oral bacteria can blunt the effect (Kapil et al., 2013). If you want the supplement to work, do not use antiseptic mouthwash on the day of dosing.
Second, many athletes choose beetroot juice that is too weak to matter. “Beet juice” and “nitrate shot” are not the same thing. Look for a product with a stated nitrate dose.
Third, athletes overdose the wrong day. If your event is on Saturday and you take beetroot juice only on Friday night, you are likely missing the best timing window.
Fourth, some people take it for every session and then stop noticing anything because they are no longer judging its effect against a clean baseline. Save it for key work.
Safety and tolerability Beetroot juice is generally safe for healthy athletes, but it can cause temporary GI upset in some people, especially at higher doses. Start with a small test dose on a normal training day before using it for competition.
It can also cause beeturia, which is harmless but can look alarming if you have never seen it before. Be aware that beetroot juice may interact with blood pressure medication or be inappropriate for some medical conditions, so athletes with cardiovascular issues should coordinate with a clinician.
How to apply this Use this protocol for the next 2 weeks:
Week 1: test dose - Pick one key interval or tempo session - Take 1 concentrated beetroot juice shot providing 5 mmol nitrate - Dose 2.5 hours before training - Avoid antibacterial mouthwash for 24 hours before and on the day of dosing - Track: average power, rep-to-rep drop-off, RPE, and how well you completed the prescription
Week 2: competition-style trial - Take the same shot 2.5 to 3 hours before your hardest session - Add carbohydrate as normal: 1 to 2 g/kg in the 2 to 4 hours before if the session is long or race-like - Hydrate normally; do not rely on beetroot juice to compensate for poor fueling - Compare session quality against week 1 and against a non-supplemented session
Use it on these sessions - 6 to 12 x 30-second intervals with 30 to 90 seconds recovery - 4 to 8 x 2-minute repeats at hard but controlled pace - Long threshold or tempo blocks where the last third matters most - Race simulations and hard group rides
Use it in this weekly pattern - Monday: no beetroot juice - Tuesday: key interval session with 5 mmol nitrate - Thursday: no beetroot juice - Saturday: race simulation or hardest bike/running session with 5 to 8 mmol nitrate
That is enough for most athletes. The goal is not constant supplementation. The goal is using a targeted ergogenic aid when the return on investment is highest.