Behaviormetrika
Online ISSN : 1349-6964
Print ISSN : 0385-7417
ISSN-L : 0385-7417
Articles
A MODEL OF THE RELATIONSHIP BETWEEN PSYCHOSOCIAL VARIABLES AND DIURNAL CORTISOL RHYTHM UNDER CHRONIC STRESS BY USING STRUCTURAL EQUATIONS
Yayoi OdaTsuneyuki AbeRuriko TakanoAmane TatsutaMinoru Nakamura
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2007 年 34 巻 1 号 p. 45-57

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By using structural equations, we investigated the effect of chronic stress on salivary cortisol rhythm and proposed a causal model of chronic stress by using psychosocial and physiological data. First, 111 healthy workers (48 males, 63 females) completed questionnaires on chronic stress and lifestyle habits. Then, they provided saliva samples and answered questionnaires that were prepared to assess their psychological states 5 times (on waking up and at 10:00, 11:40, 14:00, and 16:00) on workdays. Structural equation modeling (SEM) revealed that chronic stress and longer commuting time resulted in sleep irregularities and this disrupted the cortisol circadian rhythm. This suggests that chronic stress disrupts the cortisol circadian rhythm even in healthy individuals, and sleep regularity mediates the effect of chronic stress on the cortisol rhythm.

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© 2007 The Behaviormetric Society
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