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May  2004, 4(2): 407-417. doi: 10.3934/dcdsb.2004.4.407

Modeling the intra-venous glucose tolerance test: A global study for a single-distributed-delay model

Amitava Mukhopadhyay 1, , Andrea De Gaetano 2, and  Ovide Arino 3,

1. 

Centre for Cellular and Molecular Biology, Hyderabad - 500 007, India
2. 

BioMath Lab, CNR IASI Fisiopatologia Shock UCSC, L.go A. Gemelli, 8 - 00168 Roma, Italy
3. 

IRD Bondy et Université de Pau, Paris, France

Received  December 2001 Revised  October 2003 Published  February 2004

The Intra Venous Glucose Tolerance Test (IVGTT) is a simple and established experimental procedure in which a challenge bolus of glucose is administered intra-venously and plasma glucose and insulin concentrations are then frequently sampled. The modeling of the measured concentrations has the goal of providing information on the state of the subject's glucose/insulin control system: an open problem is to construct a model representing simultaneously the entire control system with a physiologically believable qualitative behavior. A previously published single-distributed-delay differential model was shown to have desirable properties (positivity, boundedness, global stability of solutions) under the hypothesis of a specific, square-wave delay integral kernel. The present work extends the previous results to a family of models incorporating a generic non- negative, square integrable normalized kernel. Every model in this family describes the rate of glucose concentration variation as due to both insulin-dependent and insulin-independent net glucose tissue uptake, as well as to constant liver glucose production. The rate of variation of plasma insulin concentration depends on insulin catabolism and on pancreatic insulin secretion. Pancreatic insulin secretion at time $t$ is assumed to depend on the earlier effects of glucose concentrations, up to time $t$ (distributed delay). We consider a non-negative, square integrable normalized weight function $\omega$ on $R^+ =[0, \infty)$ as the fraction of maximal pancreatic insulin secretion at a given glucose concentration. No change in local asymptotic stability is introduced by the time delay. Considering an appropriate Lyapunov functional, it is found that the system is globally asymptotically stable if the average time delay has a parameter- dependent upper bound. An example of good model fit to experimental data is shown using a specific delay kernel.
Keywords: differential equations, delay., insulin, Glucose, dynamical systems.
Mathematics Subject Classification: 39Ax.
Citation: Amitava Mukhopadhyay, Andrea De Gaetano, Ovide Arino. Modeling the intra-venous glucose tolerance test: A global study for a single-distributed-delay model. Discrete and Continuous Dynamical Systems - B, 2004, 4 (2) : 407-417. doi: 10.3934/dcdsb.2004.4.407
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