Affiliations: Dipartimento di Elettronica ed Informatica, Universita’ di Padova, Via Gradenigo 6/A, 35/31, Padova, Italy
Correspondence:
[*]
Correspondence to: Prof. Claudio Cobelli, Dipartimento di Elettronica ed Informatica, Universita’ di Padova, Via Gradenigo 6/A, 35131 Padova, Italy. Fax: +39498277699; Phone: +39498277616.
Note: [1] This paper was presented in abstract form at the 2nd ESEM Conference held in Florence, Italy, from April 30th to May 3rd, 1995.
Abstract: Insulin secretion rate (ISR) in vivo is reconstructed by deconvolution from plasma concentration of C-peptide (CP), a peptide with linear kinetics which is co-secreted with insulin but is not extracted by the liver. Deconvolution requires the knowledge of the CP impulse response. A two-exponential (2E) model is usually chosen to describe the CP impulse response but a one-exponential (IE) model is also used in the literature. The purpose here is to discuss the domain of validity of the IE model in reconstructing the ISR by deconvolution. In particular, we show that the IE model can be reliably used only if the ISR spectrum is concentrated in a narrow frequency band and a suitable input is designed for its identification.
Keywords: Physiological system, system identification
