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A Theoretical Study of Hypothalamo‐Pituitary‐Adrenocortical Axis Dynamics
Author(s) -
SAVIĆ DANKA,
JELIĆ SMILJANA
Publication year - 2005
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1342.055
Subject(s) - property (philosophy) , dynamics (music) , physics , statistical physics , classical mechanics , chemistry , mathematics , epistemology , philosophy , acoustics
A bstract : Does the hypothalamo‐pituitary‐adrenocortical (HPA) axis itself generate oscillations? The affirmative answer to this question is commonly assumed, because a regular daily rhythm of its hormones is observed. We offer another plausible explanation of the origin of this pattern: HPA just responds to an external pacemaker. A qualitative mathematical model is constructed wherein all the terms in the equations are physicochemically interpretable. Linear stability analysis shows that this system does not generate oscillations. Computer simulation yields oscillations that are the system's response to an external pulsing activator, implying that the observed pattern does not have to be an intrinsic property of this system.