By now, you鈥檝e probably sipped beet juice, pressed turmeric root into shooters, guzzled post-run coconut water, and suffered through more lumpy green smoothies than you care to admit. When it comes to getting a competitive edge, we athletes take our literal juicing seriously.听
Now a new 鈥渕ust-drink鈥 juice may be about to make its way into our already-cluttered fridges. In May, the Journal of Applied Physiology stating that L-citrulline supplementation could improve oxygen uptake (V02) and high intensity exercise performance in recreational athletes. While the study used L-citrulline tablets, in whole-food form, watermelon is the best natural source of L-citrulline鈥攂y a lot. (L-citrulline is derived from the Latin word for watermelon.)
鈥淲e knew that watermelon was this great source of L-citrulline, lycopene and potassium, but sending out slices was not logistically efficient,鈥 says Hilary Long.
Here鈥檚 how the study worked: Over a period of three seven-day cycles, ten recreational cyclists were given either L-citrulline, L-arginine, or placebo supplement tablets. On days six and seven, athletes completed both moderate and intense cycling tests. While there were no changes in performance with the L-arginine supplements, after taking the L-citrulline tablets the cyclists had improved VO2 kinetics, time-to-exhaustion, and max power during a 60-second all-out sprint. 听
Dr. Stephen Bailey, the lead researcher for this study,听is the first to point out that more research needs to be done before athletes begin swigging watermelon juice. His study used recreational athletes, but the results could be very different in elite athletes, he says. The study鈥檚 sample size, just 10 athletes, was relatively small. Furthermore, researchers are only just beginning to study how L-citrulline can affect athletic performance鈥攂efore recommendations are given, studies like this one need to be replicated to make sure the results are valid.听鈥淥ther foods have quite small L-citrulline contents compared to watermelon,鈥 Bailey says. However, 鈥測ou'd need to drink about 2.5 liters of watermelon juice to get the same dose of L-citrulline used in this study, which might not be very practical.鈥
Still, these听caveats haven鈥檛 stopped the watermelon industry from revving up its juicers.
Athletes have been a target market for melon growers for a while. A few years ago, at a meeting of the , the delegation from South Carolina鈥攚here many melons are grown鈥攄ecided the industry should focus on getting slices of watermelon into collegiate athlete鈥檚 hands. 鈥淲e knew that watermelon was this great source of L-citrulline, lycopene and potassium, but sending out slices was not logistically efficient,鈥 says Hilary Long, director of development for Tsamma, a high-end watermelon juice company.
听has been slowly catching on with听Instagram fitness celebs and the 鈥渇itfluential鈥 crowd for free product, though no real pro athletes have come knocking yet. And really, Tsamma鈥攚hich is named for the ancient melons that thrived in the arid deserts of Africa and are thought to be the ancestors of today鈥檚 watermelons鈥攊s still a tiny sliver of Frey Farm鈥檚 giant watermelon organization. But that could change.
鈥淭he buzz is definitely growing,鈥 Long says. 鈥淚 think watermelons are the coconut water of ten years ago.鈥