Metrics details. The ketogenic diet is becoming a popular nutritional model among athletes. However, the relationship between its use and metabolism during exercise seems to have not been fully investigated. During the ICT while consuming the customary diet and after the KD, oxygen uptake and carbon dioxide exhalation were registered, and CHO and fat utilization as well as energy expenditure were calculated. Male CrossFit-trained athletes seem to be more prone to shifts in macronutrient utilization in favor of fat utilization during submaximal intensity exercise under a ketogenic diet than are female athletes. Registered 11 September retrospectively registered. Carbohydrates CHO and fat are the main sources of fuel oxidized in muscles during exercise [ 1 ].
Low-carbohydrate, high-fat and ketogenic diets are increasingly adopted by athletes for body composition and sports performance enhancements. However, as yet, there is no consensus on their efficacy in improving performance. The purpose of this pilot work was two-fold: i. Using a case study design, five New Zealand endurance athletes 4 females, 1 male underwent a week ketogenic dietary intervention. Data was transcribed and analysed using thematic analysis. All athletes increased their ability to utilise fat as a fuel source, including at higher exercise intensities. Athletes reported experiencing reduced energy levels initially, followed by a return of high levels thereafter, especially during exercise, but an inability to easily undertake high intense bouts. Each athlete reported experiencing enhanced well-being, included improved recovery, improvements in skin conditions and reduced inflammation.
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The changes in the considered hormone concentrations induced by the ketogenic diet and the exercise protocol were similar to those reported previously in regard to insulin and cortisol, while lower values of testosterone after the high fat diet at rest and during the exercise protocol are difficult to explain. Influence of low versus moderate glycemic index of diet on substrate oxidation and energy expenditure during incremental exercise in endurance athletes: a randomized counterbalanced cross-over trial. In our study, three females and five males dropped out during the diet. The lactate threshold was determined by the D-max method [ 29 ]. The ketogenic diet is becoming a popular nutritional model among athletes. Metabolic characteristics of keto-adapted ultra-endurance runners. Metabolic syndrome may be defined by the response to carbohydrate restriction.