How Spinach and Arugula Nitrate Improves Mitochondrial Efficiency and Repeat-Endurance Performance

August 2, 2026

If you’ve ever finished a hard interval session thinking, “My legs were there, but my engine was not,” dietary nitrate is worth your attention. In controlled studies, nitrate from foods like spinach and arugula has improved exercise economy, reduced oxygen cost at a given workload, and boosted performance in repeated high-intensity efforts, especially when athletes use it in a targeted way rather than as a random “superfood” add-on (Jones, 2014; McMahon et al., 2017).

What dietary nitrate actually does

Dietary nitrate is not a stimulant. It works through a nitrate → nitrite → nitric oxide pathway. After you eat nitrate-rich vegetables, oral bacteria reduce nitrate to nitrite, then under low-oxygen and high-acidity conditions nitrite can be converted to nitric oxide, a signaling molecule that helps regulate blood flow, muscle contractility, and mitochondrial function (Lundberg et al., 2008; Jones, 2014).

That matters because exercise performance is often limited by how efficiently muscle uses oxygen and generates force. Nitric oxide appears to improve the coupling of oxygen use to ATP production and can reduce the oxygen cost of submaximal work. In practical terms, the same pace or power can feel slightly cheaper. That is the core advantage: better exercise economy, not a dramatic “rush.”

Why spinach and arugula are useful

Beetroot gets most of the attention, but spinach and arugula are legitimate nitrate sources. Arugula is especially dense; spinach is easy to eat in large portions and can fit into pre-training meals without feeling like a supplement protocol. The important variable is nitrate dose, not the vegetable brand name.

A useful target for performance is roughly 5–9 mmol nitrate, which is about 310–560 mg nitrate, taken 2–3 hours before training or competition (Wylie et al., 2013; McMahon et al., 2017). Food nitrate content varies with growing conditions and preparation, so you need practical approximations rather than precision-level lab numbers.

Approximate food portions that can get you into the effective range:

- Arugula: about 100–150 g can provide a strong nitrate dose, often enough for performance use.
- Spinach: about 200–300 g cooked or a large raw salad can contribute meaningfully, though content varies more than people think.

If you want to be reliable, combine nitrate-rich greens with a consistent meal pattern and test the dose in training before race day.

Mitochondrial efficiency: the real mechanism that matters

This is where nitrate becomes interesting for serious athletes. Research suggests nitrate may reduce the oxygen cost of ATP production by improving the efficiency of mitochondria and reducing ATP “waste” during muscle contraction (Larsen et al., 2011). That does not mean nitrate magically creates more mitochondria. It means existing mitochondria may produce useful work at a slightly lower oxygen expense.

For endurance athletes, that can translate to a lower heart rate drift at steady pace, better tolerance of threshold work, and more stable power output late in sessions. For hybrid athletes, it may also help during the aerobic segments that usually sabotage recovery between hard efforts.

The mechanism is especially relevant when oxygen delivery is challenged: tempo work, hill repeats, rowing, cycling time trials, repeated shuttles, and field-sport style efforts. In those settings, a small shift in efficiency can matter.

Exercise economy: why small improvements compound

Exercise economy is the oxygen or energy cost of moving at a given speed or power. If you can run the same pace with lower oxygen demand, you have more reserve for surges, climbs, and the final third of a race. If you can hold the same output with less strain, you recover faster between reps.

Studies have shown nitrate can improve economy in cycling and running, though the response is not universal and tends to be more noticeable in recreational to well-trained athletes than elite athletes who already operate near the ceiling of adaptation (Jones, 2014; McMahon et al., 2017). That is important: nitrate is a marginal gain, not a foundation. It will not rescue poor pacing, underfueling, or weak aerobic fitness.

The benefit is most useful when the event demands repeated force production with partial recovery:

- 800 m to 5 km running sessions
- Cycling intervals and time trials
- Rowing pieces
- Cross-training circuits with aerobic stress
- Soccer, basketball, rugby, hockey, and similar stop-start sports

Repeat-endurance and repeated-sprint performance

Repeat-endurance is where nitrate often earns its keep. Several studies report improved performance in repeated high-intensity efforts, especially when rest intervals are short and fatigue accumulates across sets (Thompson et al., 2016; McMahon et al., 2017). The practical advantage is not always a higher peak power; sometimes it is a smaller drop-off across reps.

That matters more than most athletes realize. A set of 8 x 400 m, 6 x 3 minutes, or repeated hill sprints is won by the athlete who loses less quality from rep 1 to rep 8. If nitrate lets you preserve power output, stride mechanics, or pacing discipline, the session outcome improves.

Here is the coaching interpretation: nitrate is most useful when you need to sustain high quality under fatigue. If your event is a single explosive attempt with full recovery, the return is less consistent. If your event is repeated hard work, the odds improve.

How much to take and when

The performance protocol that makes the most sense is:

- Dose: 5–9 mmol nitrate
- Timing: 2–3 hours before key training or competition
- Frequency: use on important sessions, or daily for 3–6 days leading into an event if you want to layer the effect

Do not assume more is better. Once you move far above the effective range, you may just increase GI discomfort or waste the food. Use the smallest dose that reliably helps your sessions.

There are two important implementation details:

1. Avoid antiseptic mouthwash and antibacterial lozenges around dosing, because they can suppress oral bacteria and reduce nitrate-to-nitrite conversion (Govoni et al., 2008).
2. Don’t pair the dose with a gigantic, fiber-heavy meal right before training if your gut is sensitive. Use the greens in a meal you already tolerate well.

What to eat around it

Nitrate is not a license to underfuel. If you want performance, combine it with adequate carbohydrate and hydration.

Best practice before a key session:

- 2–4 hours pre-session: 1–3 g/kg carbohydrate depending on session length and intensity
- Nitrate-rich meal 2–3 hours pre-session
- Fluids to ensure normal hydration status

Examples:

- 90 minutes before an interval run: rice bowl with chicken, a large arugula salad, olive oil, and fruit
- 2–3 hours before a bike workout: pasta, eggs, spinach, and yogurt
- Pre-race breakfast: oats, banana, and a spinach omelet if your stomach tolerates it

For athletes who train early, a liquid option can work better: blend spinach with fruit and yogurt, then keep the portion moderate so you don’t arrive bloated.

Who benefits most

Nitrate tends to help more when:

- You are recreational to moderately trained, not already at world-class aerobic efficiency
- The session or race lasts roughly 5 minutes to 45 minutes, or includes repeated hard bursts
- The work is performed under fatigue, hills, or short recoveries
- You respond well to pre-training nutrition and tolerate vegetables well

The response is less predictable when:

- The athlete is extremely highly trained
- The event is pure maximal power with long recovery
- The athlete has poor adherence, inconsistent dosing, or bad timing
- The meal is mishandled and causes GI distress

Safety and practical limits

Spinach and arugula are normal foods, so the main concern is not toxicity in typical athletic amounts. The real issue is dose control and individual tolerance. Spinach is also high in oxalates, so athletes prone to kidney stones should be mindful of total dietary pattern and medical history. If you have relevant kidney or vascular conditions, this is a medical decision, not a performance hack.

Also, do not confuse nitrate with nitrate-rich processed meats. The performance literature is about vegetables and nitric oxide physiology, not cured meat as an ergogenic strategy.

How to apply this

Use this simple protocol for 2 weeks and evaluate honestly:

Key workout protocol

- Choose 2 sessions per week: one threshold or tempo session, one repeat-effort session
- 2–3 hours before the session, eat a meal containing either:
- 100–150 g arugula, or
- 200–300 g spinach, or
- a combination of both that leaves you comfortably near a strong nitrate dose
- Keep the meal familiar and include 1–2 g/kg carbohydrate if the session is quality-focused
- Avoid antibacterial mouthwash for the rest of the day
- Record session quality: pace, power, heart rate, perceived exertion, and rep drop-off

Example 1-week schedule

- Monday: normal training, no nitrate
- Tuesday: interval workout with spinach/arugula meal 2–3 hours pre-session
- Wednesday: easy recovery day
- Thursday: tempo or threshold workout with nitrate meal
- Friday: normal training
- Saturday: long session or race simulation, nitrate meal if it is a key day
- Sunday: recovery

What improvement to look for

You are not chasing a miracle. Look for:

- Slightly lower RPE at the same pace or power
- Less fade in later intervals
- Better ability to hold target pace on climbs or in the final reps
- Improved repeatability across 2–3 hard sessions per week

If the effect is absent after multiple trials, move on. Nitrate is a tool, not a religion.

Bottom line for serious athletes

Spinach and arugula can be practical performance foods because they deliver dietary nitrate, which supports nitric oxide production, exercise economy, and repeat-endurance output. The payoff is modest but meaningful when you use the right dose, at the right time, for the right session. In sport, that is often enough to matter.