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Related Experiment Videos

Leg glucose uptake during maximal dynamic exercise in humans.

A Katz, S Broberg, K Sahlin

    The American Journal of Physiology
    |July 1, 1986
    PubMed
    Summary

    During intense exercise, leg glucose uptake exceeds utilization, leading to cellular glucose accumulation. This suggests glucose uptake during exercise depends on muscle energy status.

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    Area of Science:

    • Exercise Physiology
    • Muscle Metabolism

    Background:

    • Leg glucose uptake (LGU) is crucial for muscle energy supply during exercise.
    • Understanding LGU dynamics under varying exercise intensities is key to optimizing athletic performance and metabolic health.

    Purpose of the Study:

    • To quantify leg glucose uptake (LGU) during submaximal and maximal dynamic exercise.
    • To investigate the relationship between LGU, muscle energy status (phosphocreatine), and intracellular glucose metabolites (glucose-6-phosphate).

    Main Methods:

    • Quantified LGU using leg blood flow and arterial-minus-femoral venous glucose concentration.
    • Obtained muscle biopsies to analyze intracellular glucose-6-phosphate and glucose levels.
    • Measured LGU during 15 minutes of submaximal exercise and during maximal exercise to fatigue.

    Main Results:

    • LGU remained stable during submaximal exercise (1.07-1.25 mmol/min).
    • During maximal exercise, LGU increased continuously, reaching 3.82 ± 0.34 mmol/min at fatigue.
    • Muscle phosphocreatine was negatively correlated with LGU (r = -1.00, P < 0.01).
    • Intracellular glucose-6-phosphate and glucose significantly increased at fatigue (8.5 mmol/kg dry muscle, P < 0.001).

    Conclusions:

    • During heavy exercise, glucose accumulates in muscle cells, likely due to hexokinase inhibition by glucose-6-phosphate.
    • Leg glucose uptake is dependent on the muscle's energy state during short-term exercise.
    • LGU equals leg glucose utilization during submaximal exercise but exceeds it during heavy exercise.

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