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Substrate usage during prolonged exercise following a preexercise meal.

E F Coyle, A R Coggan, M K Hemmert

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |August 1, 1985
    PubMed
    Summary
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    A pre-exercise high-carbohydrate meal enhances muscle glycogen stores and carbohydrate oxidation during endurance exercise, even after insulin levels normalize. These effects on substrate utilization persist into the second hour of prolonged exercise.

    Area of Science:

    • Sports Medicine
    • Exercise Physiology
    • Nutritional Biochemistry

    Background:

    • Optimal pre-exercise nutrition is crucial for endurance performance.
    • Understanding substrate utilization during prolonged exercise is key to performance enhancement.

    Purpose of the Study:

    • To investigate the impact of a high-carbohydrate meal on substrate availability and oxidation during prolonged exercise in endurance-trained cyclists.
    • To compare exercise responses following a pre-exercise meal versus a fasted state.

    Main Methods:

    • Seven endurance-trained cyclists completed 105 minutes of exercise at 70% maximal oxygen uptake.
    • Exercise bouts were preceded by either a high-carbohydrate meal (4 hours prior) or a 16-hour fast.
    • Measurements included plasma insulin, blood glucose, muscle glycogen, and substrate oxidation rates.

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    Main Results:

    • The pre-exercise meal increased vastus lateralis muscle glycogen by 42% before exercise.
    • During the first hour of exercise, fed subjects showed lower blood glucose and higher carbohydrate oxidation rates (45% increase) compared to fasted subjects.
    • Despite initial differences, no significant variations in blood glucose, carbohydrate oxidation, or muscle glycogen were observed after 105 minutes of exercise between conditions.

    Conclusions:

    • Pre-exercise carbohydrate intake significantly alters substrate availability and utilization during the initial stages of prolonged exercise.
    • Elevated muscle glycogen from pre-exercise feeding fuels increased carbohydrate oxidation, even when insulin and glucose return to basal levels.
    • These nutritional strategies impact substrate metabolism for at least the first hour of endurance exercise.