Glycogen Depletion Patterns in Trained Rats Adapted to a High-Fat or High-Carbohydrate Diet

Oct 17, 1998International journal of sports medicine

Glycogen use in trained rats on high-fat versus high-carbohydrate diets

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Abstract

High-fat diet (HF) rats exhibited lower glycogen levels in the red vastus lateralis muscle at rest compared to high-carbohydrate diet (HC) rats.

  • RV glycogen levels were significantly lower in HF rats (27.5 ± 3.9) than in HC rats (37.6 ± 3.5) at rest.
  • At 60 minutes of exercise, RV glycogen levels were similar between HF (11.0 ± 1.9) and HC (8.6 ± 1.3) groups.
  • Glycogen use rates in the RV were lower for HF rats (985 ± 295 for 0-10 min; 356 ± 61 for 11-20 min) compared to HC rats (1593 ± 144 for 0-10 min; 1055 ± 272 for 11-20 min).
  • Resting glycogen levels in the white vastus lateralis were lower for HF rats (25.3 ± 1.6) compared to HC rats (40.7 ± 5.8).
  • Post-exercise glycogen levels in the white vastus lateralis were similar for both diets (17.0 ± 4.4 for HF; 15.7 ± 2.0 for HC).
  • Glycogen use in the white vastus lateralis was negligible in HF rats during early exercise phases compared to HC rats.

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