Social jetlag is associated with cardiorespiratory fitness in male but not female adolescents

Higgins S 1 , Stoner L 2 , Lubransky A 3 , Howe AS 4 , Wong JE 5 , Black K 3 Show all authors , Skidmore P 6

Affiliations 

  • 1 Department of Exercise Science, Elon University, NC, USA. Electronic address: shiggins8@elon.edu
  • 2 Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, NC, USA
  • 3 Department of Human Nutrition, University of Otago, Dunedin, New Zealand
  • 4 Department of General Practice and Primary Health Care, University of Auckland, Auckland, New Zealand
  • 5 Centre for Community Health Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
  • 6 Department of Medicine, University of Otago, Christchurch, 8011, New Zealand
Sleep Med, 2020 11;75:163-170.
PMID: 32858356 DOI: 10.1016/j.sleep.2020.07.030

Abstract

INTRODUCTION: Cardiorespiratory fitness (CRF) is a vital sign that can improve risk classification for adverse health outcomes. While lifestyle-related factors are associated with CRF, few have examined the influence of sleep characteristics, especially in youths. Social jetlag, a mismatch between one's biological clock and sleep schedule, is prevalent in adolescents and associated with increased adiposity, though its relationship with CRF is unclear.

OBJECTIVE: To quantify the relationship between social jetlag and CRF, independent of other sleep characteristics.

METHODS: This cross-sectional sample includes 276 New Zealand adolescents (14-18 years, 52.5% female). CRF (VO2max) was estimated from a 20-m multi-stage shuttle run. Average sleep duration, sleep disturbances, social jetlag, physical activity, and the number of bedroom screens were estimated from validated self-report surveys. Social jetlag is the difference in hours between the midpoint of sleep during weekdays (school) and weekend days (free). Combined and sex-stratified linear regression assessed the association between sleep outcomes and CRF, controlling for relevant covariates.

RESULTS: Males slept 17.6 min less, had less sleep disturbances, and a 25.1-min greater social jetlag than their female peers (all p 

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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