Exercise and insulin sensitivity: a review.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic methodology.
PubMed 10683091 · doi:10.1055/s-2000-8847
What was done
This narrative review summarizes physiological mechanisms linking acute exercise and chronic physical training to insulin sensitivity and glucose uptake in healthy individuals and patients with non-insulin-dependent diabetes mellitus (NIDDM).
What was found
The abstract reports physiological timeframes and pathways without providing numerical effect sizes or trial statistics. Elevated glucose uptake persists up to two hours post-exercise via insulin-independent mechanisms involving contraction-induced GLUT4 translocation. A single bout enhances insulin sensitivity for at least 16 hours in healthy and NIDDM subjects. Physical training potentiates these effects through increased muscle GLUT4 protein content, glycogen depletion dynamics, improved lipid metabolism, and better regulation of hepatic glucose output.
Why it matters
It clarifies the distinction between acute, short-term insulin-independent glucose uptake and long-term metabolic adaptations resulting from regular exercise training.
Limits
This is a narrative review with no systematic search criteria, meta-analytic pooling, or critical appraisal of included studies. The abstract provides no participant sample sizes or quantitative statistical estimates.
Cited by
- context Exercise-stimulated GLUT4 transporters remain active and present at the muscle cell surface to facilitate glucose uptake for up to 24 hours.