It is generally known that athletic performance when switching from a high-carbohydrate diet to a carbohydrate-restricted (CR) diet will suffer while the body adapts to the ketogenic state. Low Carb is typically less than 30-50 grams of carbs per day. In their book, “The Art and Science of Low Carb Performance, Volek and Phinney have found that it takes usually 3 weeks for performance to recover to the pre-CR state. Here is another article on the Calories Proper website entitled: “New study: high intensity exercise on a low carb diet.,” that discusses this affect and contradicts the 3 week results. These athletes maintained strength even during the adaptation period. Worth the read for anyone who is considering going low-carb.
A bonus is that the article includes a list of links to references on athletic performance on CR diets at the end. Check it out.