Stress in School. Some Empirical Hints on the Circadian Cortisol Rhythm of Children in Outdoor and Indoor Classes

Ulrich Dettweiler, Christoph Becker, Bjørn H. Auestad, Perikles Simon and Peter Kirsch
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Ulrich Dettweiler: Department of Cultural Studies and Languages, University of Stavanger, 4036 Stavanger, Norway
Christoph Becker: Department of Sports and Health Sciences, Technical University of Munich, Arcisstr. 21, 80333 Munich, Germany
Bjørn H. Auestad: Department of Mathematics and Natural Sciences, University of Stavanger, 4036 Stavanger, Norway
Perikles Simon: Faculty of Social Science, Media and Sport, Johannes Gutenberg University, Mainz Saarstr. 21, 55099 Mainz, Germany
Peter Kirsch: Department of Clinical Psychology, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, J 5, 68159 Mannheim, Germany

IJERPH, 2017, vol. 14, issue 5, 1-14

Abstract: This prospective longitudinal survey compared the stress levels of students taught using an outdoor curriculum in a forest, with children in a normal school setting. We were especially interested in the effect outdoor teaching might have on the children’s normal diurnal cortisol rhythm. 48 children (mean age = 11.23; standard deviation (SD) = 0.46) were enrolled, with 37 in the intervention group (IG), and 11 in the control group (CG). The intervention consisted of one full school day per week in the forest over the school year. Stress levels were measured in cortisol with three samples of saliva per day. Furthermore, the data allowed for statistical control of physical activity (PA) values. For data analysis, we used a linear mixed-effects model (LMM) with random intercept and general correlation matrix for the within-unit residuals. The LMM yields that IG have expected greater decline of cortisol compared to CG; rate 0.069 µg/L vs. 0.0102 µg/L (log-units/2 h), p = 0.009. PA does not show a statistically significant interaction with cortisol ( p = 0.857), despite being higher in the intervention group ( p < 0.001). The main effect in our measures was that the IG had a steady decline of cortisol during the school day. This is in accordance with a healthy child’s diurnal rhythm, with a significant decline of cortisol from morning to noon. This effect is constant over the school year. The CG does not show this decline during either measurement day. Further research is needed to fully explain this interesting phenomenon.

Keywords: stress; cortisol; physical activity; outdoor learning; mixed effect model (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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