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- Title
Effects of a Short-Term "Fat Adaptation with Carbohydrate Restoration" Diet on Metabolic Responses and Exercise Performance in Well-Trained Runners.
- Authors
Che, Kaixuan; Qiu, Junqiang; Yi, Longyan; Zou, Menghui; Li, Zhihui; Carr, Amelia; Snipe, Rhiannon M.J.; Benardot, Dan; Sureda, Antoni; Nieman, David C.
- Abstract
Periodized carbohydrate availability can enhance exercise capacity, but the effects of short-term fat adaptation carbohydrate restoration (FACR) diets on metabolic responses and exercise performance in endurance athletes have not been conclusively determined. This study aimed to investigate the effect of a FACR diet on measures of resting metabolism, exercise metabolism, and exercise performance. Well-trained male runners (n = 8) completed a FACR dietary intervention (five days' carbohydrate < 20% and fat > 60% energy, plus one-day carbohydrate ≥ 70% energy), and a control high-carbohydrate (HCHO) diet for six days (carbohydrate > 60% energy; fat < 20% energy) in a randomized crossover design. Pre- and post-intervention metabolic measures included resting metabolic rate (RMR), respiratory quotient (RQ), maximum fat oxidation rate during exercise (MFO), and maximum fat oxidation intensity (FATmax). Measures of exercise performance included maximal oxygen uptake (VO2max), running economy (RE), and 5 km running time trial (5 km-TT). In FACR compared with HCHO, there were significant improvements in FATmax (p = 0.006) and RE (p = 0.048). There were no significant differences (p > 0.05) between FACR and HCHO in RMR, RQ, VO2max, or 5 km-TT. Findings suggest that a short-term (six days) FACR diet may facilitate increased fat oxidation and submaximal exercise economy but does not improve 5 km-TT performance.
- Subjects
ADAPTABILITY (Personality); RESPIRATORY quotient; ENERGY metabolism; FAT content of food; RUNNING; OXYGEN consumption; DIET; CARBOHYDRATE content of food; EXERCISE physiology; BODY movement; DESCRIPTIVE statistics; ATHLETIC ability
- Publication
Nutrients, 2021, Vol 13, Issue 3, p1033
- ISSN
2072-6643
- Publication type
Article
- DOI
10.3390/nu13031033