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A single bout of exercise is followed by a prolonged decrease in the interstitial glucose concentration in skeletal

J Henriksson1, M Knol

  • 1Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden. Jan.Henriksson@ki.se

Acta Physiologica Scandinavica
|November 4, 2005
PubMed
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Exercise significantly lowers muscle interstitial glucose for hours post-workout, even when blood flow normalizes. This sustained decrease in muscle glucose may improve insulin sensitivity.

Area of Science:

  • Exercise Physiology
  • Metabolic Regulation
  • Skeletal Muscle Biology

Background:

  • Skeletal muscle plays a key role in glucose homeostasis.
  • Understanding post-exercise glucose dynamics is crucial for metabolic health.

Purpose of the Study:

  • To test if interstitial glucose in human skeletal muscle remains low after exercise, despite normalized blood flow.
  • To investigate the duration of this effect.

Main Methods:

  • Microdialysis was used to measure interstitial glucose, lactate, pyruvate, and urea in skeletal muscle.
  • Ethanol technique assessed muscle blood flow during 8 hours post-exercise.
  • A single bout of 2-hour one-leg exercise was performed.

Main Results:

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  • Interstitial glucose in the exercise leg was significantly reduced for 5.5 hours post-exercise (1.9 +/- 0.5 mm vs. control 4.1 +/- 0.3 mm).
  • Muscle blood flow and interstitial lactate, pyruvate, and urea levels did not differ significantly between legs or over time.
  • Blood glucose remained stable throughout the study.

Conclusions:

  • A single exercise bout markedly decreases skeletal muscle interstitial glucose for several hours.
  • This reduction may limit post-exercise glucose uptake, aiding blood glucose stability.
  • Sustained lower interstitial glucose could enhance long-term muscle insulin sensitivity.