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Increased insulin sensitivity and basal insulin effectiveness in postprandial reactive hypoglycaemia
J F Brun1, O Bouix, J F Monnier
1Service d'Exploration Physiologique des Hormones et des Métabolismes, Hôpital Lapeyronie, Montpellier, France.
Acta Diabetologica
|March 1, 1996
Summary
Patients with reactive postprandial hypoglycemia (PRH) show enhanced glucose disposal due to increased insulin sensitivity (SI) and glucose effectiveness (Sg). This study clarifies that higher tissue glucose assimilation in PRH is primarily driven by insulin-mediated processes.
Area of Science:
- Endocrinology
- Metabolic Research
- Human Physiology
Background:
- Reactive postprandial hypoglycemia (PRH) is characterized by increased glucose disposal.
- The specific contributions of insulin sensitivity (SI) and glucose effectiveness (Sg) to this phenomenon in PRH patients are not well understood.
Purpose of the Study:
- To compare insulin sensitivity (SI) and glucose effectiveness (Sg) in patients with diagnosed reactive postprandial hypoglycemia (PRH) and matched controls.
- To elucidate the mechanisms underlying enhanced glucose disposal in PRH.
Main Methods:
- Utilized the minimal model approach with intravenous glucose tolerance tests (IVGTT).
- Administered glucose (0.5 g/kg) and insulin (0.02 U/kg) intravenously, with frequent blood sampling over 180 minutes.
- Compared 13 PRH patients with 13 matched healthy controls.
Main Results:
- PRH patients exhibited significantly higher glucose tolerance (Kg), insulin sensitivity (SI), and glucose effectiveness (Sg) compared to controls.
- The enhanced Sg in PRH was attributed to increased basal insulin effectiveness (BIE), linked to higher SI.
- In some PRH subjects, elevated glucose disposal was explained by increases in SI alone, Sg alone, or both.
Conclusions:
- In sedentary individuals, increased tissue glucose assimilation in PRH is predominantly mediated by enhanced insulin action.
- Both insulin sensitivity and glucose effectiveness play roles in the glucose disposal mechanisms of PRH patients.