The hot IVGTT two-compartment minimal model: an improved version.

Area of Science:

• Metabolic Research
• Mathematical Modeling in Physiology
• Glucose Homeostasis

Background:

• The two-compartment minimal model (2CMM) is widely used for assessing individual glucose metabolism via labeled intravenous glucose tolerance tests (IVGTT).
• Previous versions of 2CMM have yielded physiologically implausible negative values for insulin-independent glucose disposal and suboptimal parameter estimation precision.
• Addressing these limitations is crucial for accurate metabolic assessment.

Purpose of the Study:

• To resolve issues of physiologically unplausible parameter values and unsatisfactory precision in the 2CMM.
• To present an improved 2CMM by modifying the assumption for the constant component of insulin-independent glucose disposal, R(d0).
• To enhance the reliability and precision of glucose metabolism assessment using IVGTT data.

Main Methods:

• Developed a revised 2CMM by expressing R(d0) as a fraction of steady-state glucose disposal, rather than fixing it to a constant value.
• Validated the new 2CMM using the same stable labeled IVGTT database used for the original model formulation.
• Compared parameter estimates and metabolic indexes between the original and improved 2CMM.

Main Results:

• The improved 2CMM yields a more reliable portrait of insulin-independent glucose disposal.
• The model successfully avoids physiologically unplausible negative values for key parameters.
• Precision in estimating model parameters and metabolic indexes is significantly enhanced.
• Insulin action assessment remains consistent with previous findings.

Conclusions:

• The revised 2CMM offers a more robust and precise method for analyzing glucose metabolism from IVGTT data.
• This improved model enhances the physiological interpretability of insulin-independent glucose disposal.
• The enhanced precision benefits the accurate assessment of metabolic health in individuals.