---
res:
  bibo_abstract:
  - <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>@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Bettina
      foaf_name: Krueger, Bettina
      foaf_surname: Krueger
  - foaf_Person:
      foaf_givenName: Bianca
      foaf_name: Stutz, Bianca
      foaf_surname: Stutz
  - foaf_Person:
      foaf_givenName: Nicole
      foaf_name: Jankovic, Nicole
      foaf_surname: Jankovic
  - foaf_Person:
      foaf_givenName: Ute
      foaf_name: Alexy, Ute
      foaf_surname: Alexy
  - foaf_Person:
      foaf_givenName: Anna
      foaf_name: Kilanowski, Anna
      foaf_surname: Kilanowski
  - foaf_Person:
      foaf_givenName: Lars
      foaf_name: Libuda, Lars
      foaf_surname: Libuda
  - foaf_Person:
      foaf_givenName: Anette E.
      foaf_name: Buyken, Anette E.
      foaf_surname: Buyken
  bibo_doi: 10.1371/journal.pone.0279620
  bibo_issue: '1'
  bibo_volume: 18
  dct_date: 2023^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1932-6203
  dct_language: eng
  dct_publisher: Public Library of Science (PLoS)@
  dct_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@'
...