Title: Effect of training in the fasted state on metabolic responses during exercise with carbohydrate intake
Authors: De Bock, Katrien ×
Derave, W
Eijnde, B. O
Hesselink, M. K
Koninckx, Erwin
Rose, A. J
Schrauwen, P
Bonen, A
Richter, E. A
Hespel, Peter #
Issue Date: Apr-2008
Publisher: Amer physiological soc
Series Title: Journal of applied physiology vol:104 issue:4 pages:1045-1055
Abstract: Skeletal muscle gene response to exercise depends on nutritional status during and after exercise, but it is unknown whether muscle adaptations to endurance training are affected by nutritional status during training sessions. Therefore, this study investigated the effect of an endurance training program (6 wk, 3 day/wk, 1-2 h, 75% of peak (V) over dot O-2) in moderately active males. They trained in the fasted (F; n = 10) or carbohydratefed state (CHO; n = 10) while receiving a standardized diet [65 percent of total energy intake (En) from carbohydrates, 20% En fat, 15% En protein]. Before and after the training period, substrate use during a 2-h exercise bout was determined. During these experimental sessions, all subjects were in a fed condition and received extra carbohydrates (1 body wt(-1) . h(-1)). Peak (V) over dot O-2 (+7%), succinate dehydrogenase activity, GLUT4, and hexokinase II content were similarly increased between F and CHO. Fatty acid binding protein (FABPm) content increased significantly in F (P = 0.007). Intramyocellular triglyceride content (IMCL) remained unchanged in both groups. After training, pre-exercise glycogen content was higher in CHO (545 +/- 19 mmol/ kg dry wt; P = 0.02), but not in F (434 +/- 32 mmol/ kg dry wt; P = 0.23). For a given initial glycogen content, F blunted exercise-induced glycogen breakdown when compared with CHO (P = 0.04). Neither IMCL breakdown (P = 0.23) nor fat oxidation rates during exercise were altered by training. Thus short-term training elicits similar adaptations in peak (V) over dot O-2 whether carried out in the fasted or carbohydrate-fed state. Although there was a decrease in exercise-induced glycogen breakdown and an increase in proteins involved in fat handling after fasting training, fat oxidation during exercise with carbohydrate intake was not changed.
ISSN: 8750-7587
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Exercise Physiology Research Group
Department of Kinesiology - miscellaneous
Laboratory of Angiogenesis and Vascular Metabolism (Vesalius Research Center) (+)
× corresponding author
# (joint) last author

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