According to this article drinking beetroot juice can boost stamina by making the muscles more fuel efficient. A study was carried out on men aged 19 to 38 and involved them cycling on exercise bikes. It was found that drinking half a litre of beetroot juice every day for a week enabled them to cycle for 16% longer before they became tired. It is thought that the beetroot juice doubles the amount of nitrate in the blood and so reduces the rate at which the muscles use their source of energy.
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