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June 1, 1992Journal of Applied Physiology

Aerobic exercise training increased the passive diameter of 1A and 2A arterioles by ~20% and the capillary-to-muscle fiber ratio by ~15% in rat skeletal muscle compared to sedentary controls.

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Key result

Aerobic exercise training increased the passive diameter of 1A and 2A arterioles by ~20% and the capillary-to-muscle fiber ratio by ~15% in rat skeletal muscle compared to sedentary controls.

Authors

JLJ. M. LashHBH. Glenn Bohlen

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Overview

Indicates functional arteriolar adaptations in select rat muscles post-training; leaves open relevance to human physiology or clinical outcomes.

Key Points

  • This study aims to investigate how aerobic exercise training affects the structure and function of arterioles in rat skeletal muscle.
  • Rats underwent 8-10 weeks of treadmill exercise training.
  • Comparisons were made between sedentary and trained rats regarding arteriole size and function during muscle contractions.
  • Vascular casts were used to assess changes in arteriolar density and diameter.
  • Trained rats exhibited greater dilation of large and intermediate-sized arterioles during muscle contractions compared to sedentary rats.
  • There was a trend towards an increase in the number of small arterioles and a 20% increase in passive diameter of larger arterioles in trained rats.
  • However, no changes were observed in arteriole diameters or density in the gracilis muscle between trained and sedentary rats.

PICO

P
Population
Rats subjected to 8-10 weeks of treadmill aerobic exercise training to assess structural and functional adaptations of skeletal muscle arterioles.
I
Intervention / Comparator
Aerobic exercise training vs Sedentary (SED)
O
Primary Outcome
Structural and functional adaptations of arterioles in skeletal muscle

Cite This Study

Lash et al. (1992) studied this question. Aerobic exercise training vs. Sedentary (SED) was evaluated on Structural and functional adaptations of arterioles in skeletal muscle. Aerobic exercise training increased the passive diameter of 1A and 2A arterioles by ~20% and the capillary-to-muscle fiber ratio by ~15% in rat skeletal muscle compared to sedentary controls.

synapsesocial.com/papers/6a63a51af2b26b064709818chttps://doi.org/10.1152/jappl.1992.72.6.2052
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