The Science of a Superfood
At the heart of beetroot's power is its high concentration of dietary nitrates. While the word 'nitrate' might bring to mind food preservatives, the naturally occurring nitrates in vegetables like beetroot, spinach, and rocket are a different story. When
you consume these foods, a fascinating biological process begins. Bacteria in your mouth convert the nitrate (NO3-) into nitrite (NO2-). This nitrite is then converted into nitric oxide (NO) in the body, particularly in conditions where oxygen is low, such as during intense exercise. This conversion is the key to unlocking beetroot's athletic benefits.
Nitric Oxide: The Performance Molecule
Nitric oxide is a potent vasodilator, meaning it relaxes and widens your blood vessels. This increased vessel diameter allows for greater blood flow throughout the body. For an athlete in the middle of a high-intensity event, this is crucial. Enhanced blood flow means more oxygen and essential nutrients can be delivered to working muscles. Studies have shown this process makes the body more efficient. It reduces the oxygen cost of exercise, meaning your muscles can produce the same amount of force with less energy. This improved efficiency can lead to enhanced tolerance to high-intensity exercise, allowing athletes to push harder for longer.
Micro-Dosing vs. Acute Loading
The term "micro-dosing" in this context refers to a strategy of consistent, daily supplementation with smaller amounts of nitrate, rather than taking one large dose immediately before an event. Research supports both acute (a single dose 2-3 hours before exercise) and chronic (daily doses over 3-7 days) strategies. However, the chronic or loading approach, often referred to as micro-dosing, may offer more sustained benefits. By taking a concentrated beetroot shot or a standardized powder daily for about a week leading up to a competition, athletes can maintain elevated levels of nitric oxide. This ensures their body is consistently primed for optimal performance, rather than relying on the peaks and troughs of single-dose timing. Studies suggest this loading protocol can be particularly effective for improving sprint and intermittent running performance.
Real-World Gains for Track Athletes
For track and field, especially in events from 400m to 5000m, the benefits are compelling. Research has linked nitrate supplementation to improved performance in running events lasting between 4 and 30 minutes. A study found runners who supplemented with beetroot juice cut 1.5% off their 5km times. Another noted a significant increase in time-to-exhaustion during high-intensity exercise. For sprinters and athletes in explosive events, the benefits may include increased muscle force production. One study found that dietary nitrate boosted peak muscle torque by 7% during maximal extension exercises. These gains, while seemingly small, can be the difference between a personal best and falling short in elite competition.
How to Approach It Safely
While beetroot is a natural food, a concentrated supplementation strategy should be approached thoughtfully. The effective dose for performance enhancement is typically around 350-600 mg of nitrate per day. It's difficult to achieve this consistently through whole beets alone, which is why concentrated juices and powders are popular. Most studies recommend taking the supplement 2-3 hours before exercise to align with peak nitric oxide availability. It's important to note that the nitrate conversion process begins in the mouth, so using antibacterial mouthwash should be avoided around the time of consumption as it can hinder the effect. Side effects are generally mild but can include pink or red urine and stools (a harmless condition called beeturia) and potential stomach upset in some individuals. Highly-trained elite athletes may see less benefit than recreational athletes, as their bodies are already highly efficient.
