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  • 1.
    Zou, Ding
    et al.
    University of Gothenburg.
    Wennman, Heini
    National Institute for Health and Welfare, Helsinki, Finland.
    Ekblom, Örjan
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology.
    Grote, Ludger
    University of Gothenburg.
    Arvidsson, Daniel
    University of Gothenburg.
    Blomberg, Anders
    Umeå University.
    Torén, Kjell
    University of Gothenburg.
    Bergström, Göran
    University of Gothenburg.
    Börjesson, Mats
    University of Gothenburg.
    Hedner, Jan
    University of Gothenburg.
    Insomnia and cardiorespiratory fitness in a middle-aged population: the SCAPIS pilot study.2019In: Sleep and Breathing, ISSN 1520-9512, E-ISSN 1522-1709, Vol. 23, no 1, p. 319-326Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The relationship between insomnia and cardiorespiratory fitness (CRF), a well-established risk factor for cardiovascular disease, has not been extensively studied. We aimed to assess the independent association between insomnia and CRF in a population-based cohort of subjects aged 50 to 64 years.

    METHODS: Subjects participating in the Swedish CArdioPulmonary bioImaging Study (SCAPIS) pilot cohort (n = 603, men 47.9%) underwent a submaximal cycle ergometer test for estimation of maximal oxygen consumption (VO2max). Data on physical activity and sedentary time were collected via waist-worn accelerometers. An insomnia severity index score ≥ 10 was used to define insomnia.

    RESULTS: Insomnia was identified in 31.8% of the population. The VO2max was significantly lower in insomnia subjects compared with the non-insomnia group (31.2 ± 6.3 vs. 32.4 ± 6.5 ml* kg-1 *min-1, p = 0.028). There was no difference in objectively assessed physical activity or time spent sedentary between the groups. In a multivariate generalized linear model adjusting for confounders, an independent association between insomnia status and lower VO2max was found in men, but not in women (β = - 1.15 [95% CI - 2.23-- 0.06] and - 0.09 [- 1.09-0.92], p = 0.038 and 0.866, respectively).

    CONCLUSIONS: We found a modest, but significant, association between insomnia and lower CRF in middle-aged men, but not in women. Our results suggest that insomnia may link to cardiovascular disease via reduced CRF. Insomnia may require a specific focus in the context of health campaigns addressing CRF.

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