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Related Experiment Videos

Leg and arm lactate and substrate kinetics during exercise.

G Van Hall1, M Jensen-Urstad, H Rosdahl

  • 1The Copenhagen Muscle Research Centre, University Hospital, Denmark. gvhall@cmrc.dk

American Journal of Physiology. Endocrinology and Metabolism
|October 22, 2002
PubMed
Summary

Elite athletes maintain low blood lactate during intense exercise by utilizing large muscle mass for lactate uptake and oxidation. Muscle activity significantly impacts limb glucose uptake and energy metabolism.

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Area of Science:

  • Exercise Physiology
  • Skeletal Muscle Metabolism
  • Human Performance

Background:

  • Understanding lactate and energy kinetics during exercise is crucial for optimizing athletic performance.
  • The interplay between muscle mass, activity, and substrate utilization during prolonged exercise remains an area of active research.

Purpose of the Study:

  • To investigate the influence of muscle mass and activity on lactate, glucose, and fatty acid kinetics in elite athletes during simulated cross-country skiing.
  • To determine the capacity of active skeletal muscle to uptake and oxidize lactate during different exercise intensities and modes.

Main Methods:

  • Measurements of whole body and limb lactate, glucose, and fatty acid fluxes in six elite cross-country skiers during roller-skiing.
  • Exercise involved diagonal stride (Continuous Arm + Leg) and double poling at 72-76% maximal oxygen uptake.

Related Experiment Videos

  • Analysis of lactate appearance rate (R(a)), arterial lactate concentration, and net limb lactate exchange.

    • Main Results:

    • High lactate appearance rate (R(a)) but low arterial lactate concentration observed during combined arm and leg exercise.
    • Active skeletal muscle demonstrated a high capacity for lactate uptake, balancing net release from the arm with uptake by the leg.
    • Limb lactate kinetics and net glucose uptake varied significantly with changes in exercise mode, while whole body glucose and glycerol turnover remained stable.

    Conclusions:

    • Arterial lactate concentration is maintained low during large muscle mass exercise due to efficient skeletal muscle lactate uptake, correlated with lactate delivery.
    • Lactate uptake and oxidation by active muscle are dependent on elevated metabolic rates, occurring at rates far exceeding resting conditions.
    • Skeletal muscle dynamically adjusts limb glucose uptake, redistributing available glucose without altering whole body glucose turnover, highlighting metabolic flexibility.