The Power of the Humble Beetroot
For generations, the beetroot has been a staple in kitchens, known for its earthy flavour and vibrant colour. But in the world of sports science, this root vegetable is gaining a reputation for something far more potent: its high concentration of dietary
nitrates. These naturally occurring compounds are the starting point for a chain reaction in the body that can significantly impact athletic performance. While found in other leafy greens like spinach and arugula, beetroot has become the focus of intense study for its reliable and high nitrate content, making it a go-to for athletes looking for a natural physiological boost.
From Nitrate to Rocket Fuel
So, how does eating a vegetable translate to faster running? The process is a fascinating piece of human biology. When you consume beetroot, bacteria on your tongue convert the dietary nitrate (NO3-) into nitrite (NO2-). This nitrite then travels through your body and, particularly in low-oxygen conditions like intense exercise, is converted into nitric oxide (NO). Nitric oxide is a powerful vasodilator, which is a scientific way of saying it helps relax and widen your blood vessels. This process increases blood flow, allowing more oxygen and nutrients to be delivered to your hard-working muscles precisely when they need it most.
Decoding Oxygen Economy
This brings us to the concept of 'oxygen economy'. Think of it like the fuel efficiency of a car. A more economical car travels further on the same amount of fuel. Similarly, an athlete with better oxygen economy can perform more work using the same amount of oxygen. Beetroot nitrate improves this efficiency in two key ways. Firstly, by increasing blood flow, it ensures oxygen is delivered more effectively. Secondly, studies suggest that nitric oxide makes the mitochondria—the powerhouses of your cells—more efficient. This means your body needs less oxygen to produce the energy required for muscle contractions, reducing the overall oxygen cost of exercise by as much as 5%.
The Sprinter's Paradox
At first glance, this focus on oxygen might seem more relevant for endurance runners than for sprinters, whose events are largely anaerobic (not using oxygen). However, the benefits are proving to be just as crucial. For sprinters, improved nitric oxide levels can enhance the function of fast-twitch muscle fibres, which are essential for explosive power. Furthermore, better oxygen efficiency aids in recovery between sprints or repeated high-intensity efforts, a common feature in training and in sports like football or hockey. Studies have shown improvements in repeated sprint performance, with athletes able to maintain higher power outputs for longer.
The Strategy of Micro-Dosing
The term 'micro-dosing' in this context isn't about taking tiny, sub-perceptual amounts. Instead, it refers to a strategic approach to supplementation. Rather than just taking one large dose, some protocols involve 'loading' with smaller, consistent doses for several days leading up to a competition. This can involve consuming around 350-500mg of nitrate daily for 3-7 days to build up plasma nitrite levels. On the day of the event, a final dose is typically taken 2-3 hours before the start to ensure nitric oxide availability is at its peak. This strategic intake, whether acute or chronic, helps athletes maximise the benefits while potentially minimising any gastrointestinal discomfort that can come from a single, large dose.
