BEETROOT has a reputation as being a source of the beneficial nitrate substances found to enhance performance and recovery in sport. Yet, the root vegetable is not the richest source of nitrate, and researchers now suggest that leafy green vegetables, such as spinach, kale and Swiss chard, can be just as effective at boosting an athlete’s competitive edge.
For the new study, scientists at the University of Leuven in Belgium recruited 27 moderately trained athletes, who were given nitrate supplements before taking part in a sprint interval training session on a bike three times a week. Volunteers were asked to train in different laboratory conditions, including normal oxygen and in hypoxic (low-oxygen) environments, such as those found in high altitudes.