---
_id: '36505'
abstract:
- lang: eng
  text: <jats:p>Young adults with a later chronotype are vulnerable for a discrepancy
    in sleep rhythm between work- and free days, called social jet lag (SJL). This
    study analysed (i) chronotype/SJL association with visceral fat/skeletal muscle
    mass, (ii) the attribution to physical activity behaviour, and (iii) chronotype-specific
    changes in physical activity behaviour in young adults during the Covid-19 pandemic
    lockdown. Chronotype and SJL were derived from the Munich-Chrono-Type-Questionnaire
    in 320 German students (age 18–25 years) from September 2019 to January 2020,
    156 of these participated in an online follow-up survey in June 2020. Body composition
    was assessed by bioimpedance analysis at baseline. Multivariable linear regression
    analyses were used to relate chronotype/SJL to body composition; the contribution
    of self-reported physical activity was tested by mediation analysis. At baseline,
    a later chronotype and a larger SJL were associated with a higher visceral fat
    mass (P&lt;0.05), this relation was notably mediated by the attention to physical
    activity (P&lt;0.05). Chronotype (P = 0.02) but not SJL (P = 0.87) was inversely
    associated with skeletal muscle mass. During the pandemic lockdown, chronotype
    hardly changed, but SJL was reduced. Timing and physical activity behaviour remained
    in most participants and changes were unrelated to chronotype (all P&gt;0.07).
    A later chronotype/higher SJL may increase the risk of a higher visceral fat mass
    even in this relatively healthy sample, which may be partly due to their physical
    activity behaviour. Despite a reduction in SJL during the pandemic lockdown, later
    chronotypes did not change their physical activity behaviour more than earlier
    chronotypes.</jats:p>
article_number: e0279620
author:
- first_name: Betina
  full_name: Krueger, Betina
  id: '49428'
  last_name: Krueger
  orcid: 0000-0001-5351-1785
- first_name: Bianca
  full_name: Stutz, Bianca
  id: '77099'
  last_name: Stutz
- first_name: Nicole
  full_name: Jankovic, Nicole
  last_name: Jankovic
- first_name: Ute
  full_name: Alexy, Ute
  last_name: Alexy
- first_name: Anna
  full_name: Kilanowski, Anna
  last_name: Kilanowski
- first_name: Lars
  full_name: Libuda, Lars
  id: '88682'
  last_name: Libuda
  orcid: 0000-0003-1603-3133
- first_name: Anette E.
  full_name: Buyken, Anette E.
  id: '65985'
  last_name: Buyken
citation:
  ama: 'Krueger B, Stutz B, Jankovic N, et al. The association of chronotype and social
    jet lag with body composition in German students: The role of physical activity
    behaviour and the impact of the pandemic lockdown. <i>PLOS ONE</i>. 2023;18(1).
    doi:<a href="https://doi.org/10.1371/journal.pone.0279620">10.1371/journal.pone.0279620</a>'
  apa: 'Krueger, B., Stutz, B., Jankovic, N., Alexy, U., Kilanowski, A., Libuda, L.,
    &#38; Buyken, A. E. (2023). The association of chronotype and social jet lag with
    body composition in German students: The role of physical activity behaviour and
    the impact of the pandemic lockdown. <i>PLOS ONE</i>, <i>18</i>(1), Article e0279620.
    <a href="https://doi.org/10.1371/journal.pone.0279620">https://doi.org/10.1371/journal.pone.0279620</a>'
  bibtex: '@article{Krueger_Stutz_Jankovic_Alexy_Kilanowski_Libuda_Buyken_2023, title={The
    association of chronotype and social jet lag with body composition in German students:
    The role of physical activity behaviour and the impact of the pandemic lockdown},
    volume={18}, DOI={<a href="https://doi.org/10.1371/journal.pone.0279620">10.1371/journal.pone.0279620</a>},
    number={1e0279620}, journal={PLOS ONE}, publisher={Public Library of Science (PLoS)},
    author={Krueger, Betina and Stutz, Bianca and Jankovic, Nicole and Alexy, Ute
    and Kilanowski, Anna and Libuda, Lars and Buyken, Anette E.}, year={2023} }'
  chicago: 'Krueger, Betina, Bianca Stutz, Nicole Jankovic, Ute Alexy, Anna Kilanowski,
    Lars Libuda, and Anette E. Buyken. “The Association of Chronotype and Social Jet
    Lag with Body Composition in German Students: The Role of Physical Activity Behaviour
    and the Impact of the Pandemic Lockdown.” <i>PLOS ONE</i> 18, no. 1 (2023). <a
    href="https://doi.org/10.1371/journal.pone.0279620">https://doi.org/10.1371/journal.pone.0279620</a>.'
  ieee: 'B. Krueger <i>et al.</i>, “The association of chronotype and social jet lag
    with body composition in German students: The role of physical activity behaviour
    and the impact of the pandemic lockdown,” <i>PLOS ONE</i>, vol. 18, no. 1, Art.
    no. e0279620, 2023, doi: <a href="https://doi.org/10.1371/journal.pone.0279620">10.1371/journal.pone.0279620</a>.'
  mla: 'Krueger, Betina, et al. “The Association of Chronotype and Social Jet Lag
    with Body Composition in German Students: The Role of Physical Activity Behaviour
    and the Impact of the Pandemic Lockdown.” <i>PLOS ONE</i>, vol. 18, no. 1, e0279620,
    Public Library of Science (PLoS), 2023, doi:<a href="https://doi.org/10.1371/journal.pone.0279620">10.1371/journal.pone.0279620</a>.'
  short: B. Krueger, B. Stutz, N. Jankovic, U. Alexy, A. Kilanowski, L. Libuda, A.E.
    Buyken, PLOS ONE 18 (2023).
date_created: 2023-01-13T07:15:13Z
date_updated: 2023-01-24T11:54:46Z
department:
- _id: '35'
- _id: '22'
doi: 10.1371/journal.pone.0279620
intvolume: '        18'
issue: '1'
keyword:
- Multidisciplinary
language:
- iso: eng
publication: PLOS ONE
publication_identifier:
  issn:
  - 1932-6203
publication_status: published
publisher: Public Library of Science (PLoS)
status: public
title: 'The association of chronotype and social jet lag with body composition in
  German students: The role of physical activity behaviour and the impact of the pandemic
  lockdown'
type: journal_article
user_id: '61597'
volume: 18
year: '2023'
...