How Pre-Training Rhubarb Nitrate Can Improve Blood Flow, Economy, and Repeated-Set Performance
Rhubarb can be a practical nitrate source for athletes who want better blood flow, lower oxygen cost, and stronger repeated-set output without relying on beet shots.
If you can cut 1–3% off the oxygen cost of a hard run or get one more quality set before bar speed falls off, that matters. Dietary nitrate can do exactly that, and rhubarb is an underused source worth paying attention to. The mechanism is simple: nitrate converts to nitrite and then nitric oxide, which helps vasodilation, muscle efficiency, and exercise performance under the right conditions (Jones, 2014).
Why nitrate works
Nitrate is not magic; it is chemistry. After ingestion, nitrate is concentrated in saliva, reduced by oral bacteria to nitrite, then further converted to nitric oxide in blood and tissues, especially when oxygen availability is lower and muscle acidity rises (Lundberg, Weitzberg, & Gladwin, 2008). Nitric oxide supports blood vessel dilation, improves blood flow distribution, and can reduce the ATP cost of force production by influencing mitochondrial efficiency and calcium handling in muscle (Jones, 2014).
That is why nitrate tends to help most in tasks that are submaximal, repeated, or done under fatigue: steady cycling, running economy, repeated sprints, and resistance training volume. You are not buying a stimulant effect. You are buying a small but meaningful shift in efficiency.
Why rhubarb is interesting
Beetroot gets all the attention, but rhubarb can be a useful nitrate-containing food for athletes who want variety or dislike beet flavor. The actual nitrate content varies with cultivar, season, growing conditions, and storage, so rhubarb is less standardized than supplements or concentrated beet shots. That variability is the main limitation: you cannot assume every serving contains the same dose.
Still, rhubarb has two practical advantages. First, it is a real food that can be built into a pre-training meal. Second, for athletes who already eat plants daily, rhubarb gives another route to increase nitrate intake without relying only on supplements. The key is dose awareness. To get performance effects, you need a meaningful nitrate intake, not just a decorative serving of fruit pie filling.
What dose is useful
Most performance studies on dietary nitrate use about 5 to 9 mmol of nitrate, which is roughly 310 to 560 mg nitrate, taken as a single dose 2 to 3 hours before exercise or split across 3 to 6 days before a competition or testing day (Jones, 2014; Senefeld et al., 2020). That timing matters because plasma nitrite tends to peak a few hours after ingestion, which is when the nitric oxide pathway is most available.
Because rhubarb is not a standardized sports nutrition product, use it as part of a nitrate strategy rather than trying to guess exact milligrams from one stalk. If you want reliability, pair rhubarb with a known nitrate source on key days, or use rhubarb regularly in a diet that already emphasizes high-nitrate vegetables. If your goal is a measurable ergogenic effect, the dose needs to be deliberate.
What it can improve
1) Blood flow and vascular function
Nitrate-derived nitric oxide improves endothelial function and vasodilation, which can support blood flow during exercise and recovery (Lundberg, Weitzberg, & Gladwin, 2008). Better vasodilation does not mean magical pump sensations. It means oxygen and nutrient delivery can be more efficient, especially when tissues are stressed.
2) Exercise economy
Exercise economy is the oxygen cost of a given workload. In endurance athletes, nitrate supplementation has repeatedly reduced oxygen consumption during submaximal work and improved tolerance to the same pace or power output (Jones, 2014; Senefeld et al., 2020). For runners, that can mean slightly easier 5K pace at the same aerobic cost. For cyclists, it can mean holding a target wattage with less drift.
3) Repeated-set performance
In the weight room, the relevant outcome is not one maximal rep; it is how much quality work you can repeat before fatigue collapses bar speed or technique. Nitrate appears most useful for moderate-load, high-volume work and repeated efforts with short rest, where muscle oxygen delivery and contractile efficiency matter more than maximal neural drive alone (Wylie et al., 2013).
That means nitrate can help you squeeze out one extra rep at a given load, preserve output across later sets, or sustain quality in a conditioning session. It is not a replacement for creatine, and it will not turn a poor program into a good one. But it can help you express more of your current fitness.
Rhubarb protocol for training days
Use this if you are trying to time a rhubarb-containing meal before a hard session.
Option 1: single pre-training dose
- Eat rhubarb with a nitrate-rich meal 2 to 3 hours before training.
- Pair with spinach, arugula, romaine, or celery to raise total nitrate exposure.
- Keep the meal moderate in fat and fiber if you train soon after, so gastric emptying is not slowed too much.
- Avoid antibacterial mouthwash and do not aggressively sanitize the mouth on nitrate days, because oral bacteria are needed for nitrate-to-nitrite conversion (Lundberg, Weitzberg, & Gladwin, 2008).
Option 2: loading strategy for competition or testing
- Eat nitrate-rich foods daily for 3 to 6 days before the key session.
- Include rhubarb in one meal per day, but anchor the plan with other known nitrate vegetables.
- On the final day, take the largest nitrate-containing meal 2 to 3 hours before the event.
What not to expect
Nitrate is not equally effective for everyone. Trained athletes often show smaller improvements than recreational athletes, and some individuals are clear non-responders. The most likely reasons are already-high endogenous nitric oxide availability, differences in muscle fiber type, diet, and oral microbiome status (Jones, 2014).
Also, nitrate works best for submaximal and repeated work. It is less consistent for one-rep max strength, sprinting that is almost purely alactic, and highly trained endurance athletes who already have efficient physiology. If you are chasing absolute peak power on a single lift, do not treat rhubarb as a secret weapon.
Safety and practical limits
Rhubarb leaves are not food; they contain high levels of oxalates and can be toxic. Only use the edible stalks. For most healthy athletes, dietary nitrate from vegetables is considered safe at the amounts used in performance nutrition. People with kidney stone history, kidney disease, or specific medical restrictions should be cautious with high-oxalate foods and should not use food strategies blindly.
The bigger practical issue is consistency. One rhubarb serving may be useful as part of a nitrate-rich meal, but if you want the kind of effect seen in controlled studies, you need a repeatable plan and enough total nitrate. That is why I treat rhubarb as a supporting player, not the whole strategy.
How to apply this
Use this exact weekly setup if you want to test whether nitrate-rich rhubarb helps your training:
For endurance or hybrid athletes
- Tuesday and Friday hard sessions: eat a nitrate-rich meal 2 to 3 hours pre-training.
- Include rhubarb plus another high-nitrate vegetable.
- Aim for a meal that gives roughly 5 to 9 mmol total nitrate from combined foods if you can estimate it.
- Repeat for 2 weeks and compare pace, heart rate, and perceived exertion at the same workload.
For lifters doing repeated-set hypertrophy work
- Use nitrate-rich meals on your highest-volume lower-body or full-body days.
- Take the meal 2 to 3 hours before training.
- Track performance on a stable benchmark: for example, 4 sets of 8 at 75% 1RM with 2 minutes rest.
- Look for one more rep in later sets, better bar speed, or less drop-off across sets.
Simple checklist
1. Choose one training day to test.
2. Eat rhubarb as part of a nitrate-rich meal 2 to 3 hours before lifting or running.
3. Do not use mouthwash that day.
4. Keep caffeine and carbs consistent so you can actually see the nitrate effect.
5. Track output for 2 to 4 weeks before deciding if it is worth keeping.
If you want the performance benefit, treat rhubarb like a precision tool: use it on sessions where small improvements matter, combine it with other nitrate-rich vegetables, and time it correctly. The athletes who get useful results are the ones who control dose, timing, and context—not the ones who just add a random vegetable to dinner and hope for the best.