LCHF Diets for Sports Performance: Questionable method for trained athletes?

Multiple studies during the period of 1985-2005 examined the proposal that adaptation to a Low Carbohydrate High Fat (LCHF) diet to increase muscle fat utilization during exercise could enhance performance in trained individuals by reducing reliance on muscle glycogen.  As little as five days of training with a LCHF diet retools the muscle to enhance fat burning capacity with robust changes that persist despite acute strategies to restore carbohydrate availability(glycogen super-compensation), and a 2-3 week exposure to minimal Carbohydrate(<20g/day) intake achieves adaptation to high Blood Ketone concentrations(Hopkins et al, 1999); However, the failure to detect clear performance benefits during endurance/ultra endurance protocols, combined with evidence of impaired performance of high-intensity exercises via a down regulation of Carbohydrate metabolism has led to the skepticism of the LCHF diet creating enhanced performance outcomes in trained individuals.  

Sporting events last from seconds(jumps, throws) to weeks(Tour de France), with success being determined by a complex and often changing range of characteristics including power, strength, endurance, agility, skill, and decision making.  The role of training is to accumulate adaptations in the muscle and other body organs/systems to achieve specific characteristics that create success in the athletes event via a series of systematic and periodized stimuli, involving the interaction of nutrition and exercise(Hawley et al, 2011).

There has been a significant re-emergence of interest in LCHF diets, coupled with anecdotes of improved performance; However, the question that still needs to be answered today is, Does a Ketogenic LCHF diet create clear performance benefits during both endurance and high-intensity protocols for trained individuals?