{
  "creator": [
    "Randler, Christoph",
    "Haun, Julia",
    "Schaal, Steffen"
  ],
  "date": [
    "2013-05-31"
  ],
  "description": [
    "Recent work has established an association between overweight/obesity and sleep duration, suggesting that short sleep duration and timing of sleeping may lead to overweight. Most of these studies considered sleep-length rather than any other aspects associated with the sleep and wake rhythm, e.g. chronotype, which is a measure of timing of sleeping (‘when to sleep’; based on the midpoint of sleep). The objective of this study was to assess the influence of different factors of the sleep-wake cycle and of co-variates on the Body Mass Index in a cross-sectional questionnaire study. Nine hundred and thirteen pupils (406 boys, 507 girls) from Southwestern Germany participated in this study. Mean age was 13.7 ± 1.5 (SD) years and range was between 11 – 16 years. We found that chronotype (β = .079) and social jetlag (β = .063) showed a significant influence on Body Mass Index (BMI), while sleep duration did not. Social jetlag is the absolute difference between mid-sleep time on workdays and free days. Further, screen time (in front of TV, computer, β = .13) was positively related with BMI. Self-efficacy on nutrition (β = -.11), a psychological variable important in health-behaviour models, showed an influence with high scores on self-efficacy related to lower BMI. A high BMI was correlated with low fast-food consumption (β = -.12) suggesting that adolescents with high BMI may exert some control over their eating."
  ],
  "format": [
    "application/pdf",
    "text/html"
  ],
  "identifier": [
    "https://ejop.psychopen.eu/index.php/ejop/article/view/558",
    "10.5964/ejop.v9i2.558"
  ],
  "language": [
    "eng"
  ],
  "publisher": [
    "PsychOpen GOLD / Leibniz Institut for Psychology (ZPID)"
  ],
  "relation": [
    "https://ejop.psychopen.eu/index.php/ejop/article/view/558/558.pdf",
    "https://ejop.psychopen.eu/index.php/ejop/article/view/558/558.html"
  ],
  "rights": [
    "https://creativecommons.org/licenses/by/3.0"
  ],
  "source": [
    "Europe’s Journal of Psychology; Vol. 9 No. 2 (2013); 339-347",
    "1841-0413"
  ],
  "subject": [
    "adolescents",
    "biological rhythms",
    "chronotype",
    "sleep duration",
    "self-efficacy",
    "screen time",
    "overweight"
  ],
  "title": [
    "Assessing the Influence of Sleep-Wake Variables on Body Mass Index (BMI) in Adolescents"
  ],
  "type": [
    "info:eu-repo/semantics/article",
    "info:eu-repo/semantics/publishedVersion"
  ]
}