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01.09.2017


Sports drink with ketone ester and carbs works better than carb-only sports drink

Endurance athletes perform better if just before - and probably during - lengthy and high-intensity sessions they drink a combination of a ketone ester and fast carbohydrates than if they only drink carbohydrates. Physiologists at the University of Oxford wrote about this in 2016 in Cell Metabolism. The researchers are the inventors of the ketone sports drink DeltaG, which we've written about before.

Study

The researchers got eight cyclists to do two sessions on a cyclometer. Each session consisted of one hour of cycling at moderate intensity (75 percent of their maximal capacity) and then a 30-minute timed ride. The cyclists had to cycle as far as they could in the half hour.

On one occasion, before starting, the cyclists were given a sports drink containing glucose, fructose and maltodextrin, all fast carbohydrates. On the other occasion they were given a sports drink containing glucose and a ketone ester.


Sports drink with ketone ester and carbs works better than carb-only sports drink


This is what the researchers write about the ketone ester:


Sports drink with ketone ester and carbs works better than carb-only sports drink


Results
The cyclists managed to cycle an average of 411 metres further during the timed ride after drinking the sports drink that contained ketone ester than when they'd drunk fast carbs only.


Sports drink with ketone ester and carbs works better than carb-only sports drink


In the hour that they cycled at 75 percent of their maximal capacity, the blood glucose levels decreased slightly more in the cyclists who had drunk the ketone ester. Halfway through that hour the blood concentration of free fatty acids rose when the cyclists had drunk carbohydrates, but it did not when they had the drink that contained ketone ester.


Sports drink with ketone ester and carbs works better than carb-only sports drink


Sports drink with ketone ester and carbs works better than carb-only sports drink


At the same time the lactate concentration increased less after drinking the product that contained ketone ester than it did after drinking carbs only.

These facts suggest that ketones do not function as fuel but do help muscles to use glucose more thriftily and therefore don't have to go over to burning fat reserves so quickly. That makes ketone supplementation interesting for endurance athletes who have to do intensive exercise over long periods of time.

Conclusion
"The ketone itself is inhibiting glycolysis, so that with the same exercise you're preserving glycogen and producing much less lactic acid," said research team leader Kieran Clarke in a press release. [sciencedaily.com July 27, 2016] "This hasn't been seen before."

"What may be happening is if you are doing something that isn't a sprint, like going on a 26-mile run, you won't hit the wall as quickly. Not only that, but it stops you from aching afterwards."

Source:
Cell Metab. 2016 Aug 9;24(2):256-68.

More:
Sports drinks with ketones speed up muscle recovery 20.06.2017
Delay aging without strict diet: supplement with ketones 05.04.2017
GHB's little brother makes low-carb diet enjoyable 13.08.2009

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