How Nitrate-Rich Foods Like Beets and Arugula Improve Muscle Oxygen Efficiency, Repeat Sprint Performance, and Endurance Recovery

July 23, 2026

If you’ve ever bonked on the second interval set while your training partner still looks fresh, nitrate-rich foods may be the missing lever. In multiple studies, beetroot juice and other high-nitrate foods improved exercise economy, reduced oxygen cost at a given workload, and extended time to exhaustion, especially when the session demanded repeated hard efforts rather than a single all-out burst (Jones, 2014; McMahon et al., 2017).

What dietary nitrate actually does

Dietary nitrate is not the same thing as supplements marketed for “pump” effects. You ingest nitrate from foods like beets, arugula, spinach, celery, and lettuce. Oral bacteria convert nitrate to nitrite, then your body converts nitrite to nitric oxide, especially when oxygen availability drops during hard exercise. Nitric oxide helps improve blood flow regulation, muscle contractility, mitochondrial efficiency, and the way working muscle uses oxygen (Lundberg et al., 2008; Dominguez et al., 2017).

The performance benefit is simple: when muscles can do the same work with less oxygen cost, you delay fatigue. That matters for runners, rowers, cyclists, field-sport athletes, and lifters doing high-density work like sled pushes, complexes, or repeated sprints.

Why it can improve muscle oxygen efficiency

The strongest practical effect is improved exercise economy or efficiency. In plain terms, at a fixed pace or power output, you may consume less oxygen after nitrate loading. That means the same run, row, or bike wattage costs less physiologically (Lansley et al., 2011).

Mechanistically, nitric oxide may reduce the ATP cost of force production and improve the way mitochondria handle energy demand during submaximal work. It may also improve blood vessel dilation in active muscle, helping oxygen delivery when demand rises (Jones, 2014). The net effect is not magic speed; it is a better oxygen-to-output ratio.

This is why the effect tends to show up more clearly in endurance tasks, repeated sprints, and high-intensity intervals than in a single maximal lift. If your event has a heavy aerobic component or demands recovery between efforts, nitrate is relevant.

What the research says for endurance performance

Beetroot juice has repeatedly shown small-to-moderate improvements in endurance performance, especially in sub-elite athletes and in tests lasting roughly 5 to 30 minutes (McMahon et al., 2017). One reason is that nitrate can help lower the oxygen cost of submaximal exercise, which makes threshold work feel more manageable.

In practical terms, athletes often see one of three outcomes:

- the same pace feels easier,
- the same pace costs less oxygen,
- or they can hold target pace longer before fading.

That is why nitrate works best for tempo runs, time trials, rowing pieces, cycling efforts, and hard mixed-modal conditioning where fatigue management matters more than pure top speed.

Repeat sprint performance: where nitrate can matter most

The repeat-sprint domain is where nitrate becomes interesting for hybrid athletes and team-sport players. The value is not the first sprint; it is the ability to keep producing quality output across sprint 4, 5, 6, and beyond.

Research has found that nitrate supplementation can improve repeated sprint performance and high-intensity intermittent exercise, likely by improving muscle efficiency and maintaining power output as fatigue accumulates (Thompson et al., 2015; Wylie et al., 2013). The benefit is most likely when the rest periods are short, when the athlete is moderately trained, and when the session is long enough for fatigue to accumulate.

If you are doing:

- 10 x 30 seconds hard / 30 seconds easy,
- 6 x 200 m with short rest,
- repeated sled pushes,
- assault bike intervals,
- or court/field sprints with incomplete recovery,

nitrate-rich foods may help you preserve output deeper into the session.

Endurance recovery between efforts

Recovery here means how well you restore between bouts, not just whether you feel less sore later. Nitrate may support recovery between hard efforts by improving perfusion, helping maintain muscle oxygenation, and reducing the oxygen penalty of the next work bout (Dominguez et al., 2017).

That makes it useful for competitions and training days that stack stress:

- morning intervals plus evening strength,
- soccer practice followed by repeated accelerations,
- or a long run followed by strides and lifting.

It does not replace carbohydrates, fluids, or sleep. But when total training stress is high, small gains in efficiency can compound into better quality work across the session.

How much nitrate you need

This is where most people underdose.

Most performance studies use about 5 to 9 mmol of nitrate, which is roughly 310 to 560 mg nitrate, taken 2 to 3 hours before exercise (Jonvik et al., 2018; Kerley et al., 2017). A common beetroot juice shot delivers this range, but whole-food intake varies more.

Practical food equivalents are less precise because nitrate content depends on soil, storage, and preparation. As a coach, I’d use foods as the base and concentrates as the backup when you need predictable dosing.

A solid food-first pre-training protocol looks like this:

- 250 to 500 g roasted or boiled beets, or
- a large arugula salad plus other nitrate-rich greens, or
- 1 concentrated beet shot providing 5 to 8 mmol nitrate.

For a hard session, aim to land the dose 2 to 3 hours pre-workout. That timing matches the nitrate-to-nitrite-to-nitric-oxide conversion curve in most people.

Beets vs arugula: which is better?

Beets get the spotlight because beet juice studies are abundant and dosing is easier. But arugula is often even more nitrate-dense per gram than beets. Spinach, lettuce, celery, and cress also contribute meaningfully.

Use this rule:

- Beets: easiest for reliable performance dosing.
- Arugula: excellent in salads or wraps when you want high nitrate with low calories.
- Spinach and mixed greens: useful daily support, but less precise for pre-race dosing.

If you want predictable results, beets win on convenience. If you want to build nitrate intake into normal meals, arugula is a standout.

How to use nitrate without sabotaging the effect

Two common mistakes wreck the response.

First, antibacterial mouthwash or aggressive antibacterial gum use can blunt the oral bacteria needed to convert nitrate to nitrite (Govoni et al., 2008). Don’t use mouthwash right before your nitrate dose if you want the performance effect.

Second, don’t assume more is always better. The dose-response appears to plateau, and huge servings do not reliably produce larger gains. Stick to the evidence-based range and track your response.

Other practical points:

- Test your GI tolerance in training first.
- Pair the dose with a normal meal if your stomach is sensitive.
- Avoid trying a new nitrate strategy on race day.
- If you are already using caffeine, the combo may be useful, but test it in practice because some athletes respond better than others.

Who is most likely to benefit

The response is not identical across athletes. Nitrate tends to help more when:

- you are recreational or moderately trained rather than world-class elite,
- the event lasts several minutes or includes repeated hard efforts,
- the athlete has room to improve efficiency,
- and baseline nitric oxide production may be lower (Jones, 2014; McMahon et al., 2017).

That means nitrate is especially relevant for runners, cyclists, rowers, CrossFit-style athletes, soccer players, hockey players, and hybrid trainees. Strength athletes can still use it for conditioning blocks, sled work, and repeated-effort sessions.

How to apply this

Use this exact protocol for a key training day or race simulation:

For a 5 to 30 minute endurance effort

- 2 to 3 hours before: take 5 to 8 mmol nitrate from beet juice or a high-nitrate meal.
- Keep the pre-event meal normal: 1 to 2 g/kg carbohydrate, low fiber if your gut is sensitive, moderate protein, low fat.
- Avoid antibacterial mouthwash for the day.
- Warm up normally.
- Re-test the same setup in training before relying on it in competition.

For repeat-sprint or interval sessions

- 2 to 3 hours before: 5 to 8 mmol nitrate.
- Use it on sessions like 8 to 12 x 20 to 30 seconds hard with 30 to 60 seconds rest, or 6 to 10 repeats of 200 to 400 m.
- If the session is in the evening, you can use nitrate at lunch and keep the pre-workout meal lighter.

For hybrid athletes stacking endurance and lifting

- Put nitrate on your hardest conditioning day, not your easiest lift day.
- Example week:
- Monday: lower-body strength, no nitrate needed.
- Tuesday: intervals or hill sprints, nitrate 2 to 3 hours pre-workout.
- Thursday: tempo run or row, nitrate 2 to 3 hours pre-workout.
- Saturday: longer mixed-modal session, nitrate if the session includes repeated hard efforts.

Simple checklist

- Choose beets, arugula, or a standardized beet shot.
- Hit 5 to 8 mmol nitrate.
- Time it 2 to 3 hours pre-session.
- Skip antibacterial mouthwash.
- Use it first in training, then in competition.
- Record pace, power, RPE, and recovery between bouts.

What to expect in the real world

Expect a performance edge, not a transformation. You are looking for slightly lower perceived effort, better maintenance of pace or power, and less fade across repeated hard bouts. That may be enough to turn a mediocre interval session into a high-quality one or to keep your final kilometer from falling apart.

If you want the biggest return, combine nitrate-rich foods with the basics that still matter most: enough carbohydrate, adequate hydration, and sleep. Nitrate is a tool for efficiency. It works best in an athlete who already has the fundamentals in place.