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Related Experiment Videos

Effects of training on muscle capillary pattern: intermittent vs continuous exercise.

J M Soares1

  • 1Department of Sport Biology, Faculty of Sport Sciences, University of Porto, Portugal.

The Journal of Sports Medicine and Physical Fitness
|June 1, 1992
PubMed
Summary

Both intermittent and continuous endurance exercise training significantly increase skeletal muscle fiber size and capillary density in mice. This suggests endurance exercise alters muscle structure, enhancing its capacity for oxygen supply.

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Area of Science:

  • Exercise Physiology
  • Skeletal Muscle Biology
  • Cellular Adaptations to Exercise

Background:

  • Skeletal muscle adaptations are crucial for improving physical performance and health.
  • Understanding how different exercise modalities impact muscle structure is essential.
  • Capillarization and fiber area are key indicators of muscle's metabolic capacity.

Purpose of the Study:

  • To investigate the effects of intermittent versus continuous endurance exercise on mouse gastrocnemius muscle.
  • To analyze changes in muscle fiber area and capillarization in response to training.
  • To compare the structural adaptations induced by two distinct endurance training protocols.

Main Methods:

  • Mice underwent 30-day endurance training programs (5 days/week) on a treadmill.

Related Experiment Videos

  • Intermittent exercise: 16 m/min, 5% grade.
  • Continuous exercise: 16 m/min, 0% grade.
  • Gastrocnemius muscle (white portion) analyzed for fiber area and capillarization.

    • Main Results:

    • Both exercise groups exhibited significant muscle fiber hypertrophy.
    • A notable increase in capillary density was observed in both training groups.
    • Significant improvements in capillary-to-fiber ratio and capillary number (oblique/longitudinal sections) were found.

    Conclusions:

    • Endurance training, whether intermittent or continuous, promotes skeletal muscle cell hypertrophy.
    • Both training types significantly enhance muscle capillarization.
    • These adaptations suggest a fundamental alteration in muscle structural patterns induced by endurance exercise.