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Low-Carbohydrate-High-Fat Diet: Can it Help Exercise Performance?

View Article: PubMed Central - PubMed

ABSTRACT

Low-carbohydrate-high-fat (LCHF) diets have been used as a means of weight loss and control of symptoms in several clinical conditions. There is emerging evidence that the metabolic changes induced by LCHF diets enhance endurance performance. The aims of this review are to examine the evidence of LCHF diets in improving various aspects of athletic performance. Long-term LCHF dietary intake may help control body weight and fat mass while maintaining lean body mass in athletes in weight-sensitive sports. LCHF-adapted endurance athletes can reach the maximal fat oxidation rate of approximately 1.5 g/min, with a lower carbohydrate oxidation rate and similar muscle glycogen content and a resynthesis rate compared to their counterparts consuming high-carbohydrate-low-fat (HCLF) diets. The elevated fat oxidation rate and glycogen sparing effect may improve performance in ultra-endurance events. These metabolic changes may also prevent the decline in performance in later stages of repeated high-intensity movements, in which the aerobic metabolism becomes more important. However, elevated blood concentrations of non-esterified fatty acids and ammonia during exercise after LCHF diets may lead to early development of central fatigue. It appears that at least several months of adaptation to a LCHF diet are required for the metabolic changes and restoration of muscle glycogen to occur. Further investigations on LCHF diets are needed regarding (1) performance after weight loss in weight-categorized sports; (2) repeated high-intensity exercise performance; (3) development of central fatigue during endurance events; (4) perceptual-motor performance during prolonged intermittent sports; and (5) ideal dietary fatty acid compositions.

No MeSH data available.


Potential mechanisms to improve endurance and repeated high-intensity exercise after long-term adaptation to low-carbohydrate-high-fat diets
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j_hukin-2017-0025_fig_001: Potential mechanisms to improve endurance and repeated high-intensity exercise after long-term adaptation to low-carbohydrate-high-fat diets

Mentions: Subcellular changes that support skeletal muscle adaptation to LCHF diets include upregulation of enzymes involved in fatty acid oxidation such as β-hydroxyacyl CoA dehydrogenase (Cameron-Smith et al., 2003), fatty acid translocase/CD36 (Cameron-Smith et al., 2003), and carnitine palmitoyl transferase-1 (Goedecke et al., 1999), and downregulation of enzymes supporting carbohydrate oxidation such as pyruvate dehydrogenase (Chokkalingam et al., 2007). These enzymatic changes after LCHF diets may account for the increase in the fat oxidation rate. The potential effects of long-term adaptation to LCHF diets on endurance performance are presented in Figure 1.


Low-Carbohydrate-High-Fat Diet: Can it Help Exercise Performance?
Potential mechanisms to improve endurance and repeated high-intensity exercise after long-term adaptation to low-carbohydrate-high-fat diets
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC5384055&req=5

j_hukin-2017-0025_fig_001: Potential mechanisms to improve endurance and repeated high-intensity exercise after long-term adaptation to low-carbohydrate-high-fat diets
Mentions: Subcellular changes that support skeletal muscle adaptation to LCHF diets include upregulation of enzymes involved in fatty acid oxidation such as β-hydroxyacyl CoA dehydrogenase (Cameron-Smith et al., 2003), fatty acid translocase/CD36 (Cameron-Smith et al., 2003), and carnitine palmitoyl transferase-1 (Goedecke et al., 1999), and downregulation of enzymes supporting carbohydrate oxidation such as pyruvate dehydrogenase (Chokkalingam et al., 2007). These enzymatic changes after LCHF diets may account for the increase in the fat oxidation rate. The potential effects of long-term adaptation to LCHF diets on endurance performance are presented in Figure 1.

View Article: PubMed Central - PubMed

ABSTRACT

Low-carbohydrate-high-fat (LCHF) diets have been used as a means of weight loss and control of symptoms in several clinical conditions. There is emerging evidence that the metabolic changes induced by LCHF diets enhance endurance performance. The aims of this review are to examine the evidence of LCHF diets in improving various aspects of athletic performance. Long-term LCHF dietary intake may help control body weight and fat mass while maintaining lean body mass in athletes in weight-sensitive sports. LCHF-adapted endurance athletes can reach the maximal fat oxidation rate of approximately 1.5 g/min, with a lower carbohydrate oxidation rate and similar muscle glycogen content and a resynthesis rate compared to their counterparts consuming high-carbohydrate-low-fat (HCLF) diets. The elevated fat oxidation rate and glycogen sparing effect may improve performance in ultra-endurance events. These metabolic changes may also prevent the decline in performance in later stages of repeated high-intensity movements, in which the aerobic metabolism becomes more important. However, elevated blood concentrations of non-esterified fatty acids and ammonia during exercise after LCHF diets may lead to early development of central fatigue. It appears that at least several months of adaptation to a LCHF diet are required for the metabolic changes and restoration of muscle glycogen to occur. Further investigations on LCHF diets are needed regarding (1) performance after weight loss in weight-categorized sports; (2) repeated high-intensity exercise performance; (3) development of central fatigue during endurance events; (4) perceptual-motor performance during prolonged intermittent sports; and (5) ideal dietary fatty acid compositions.

No MeSH data available.