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Examination of mid-intervention mediating effects on objectively assessed sedentary time among children in the Transform-Us! cluster-randomized controlled trial

The international journal of behavioral nutrition and physical activity, 2013-05, Vol.10 (1), p.62-62, Article 62 [Peer Reviewed Journal]

COPYRIGHT 2013 BioMed Central Ltd. ;2013 Carson et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ;Copyright © 2013 Carson et al.; licensee BioMed Central Ltd. 2013 Carson et al.; licensee BioMed Central Ltd. ;ISSN: 1479-5868 ;EISSN: 1479-5868 ;DOI: 10.1186/1479-5868-10-62 ;PMID: 23688180

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  • Title:
    Examination of mid-intervention mediating effects on objectively assessed sedentary time among children in the Transform-Us! cluster-randomized controlled trial
  • Author: Carson, Valerie ; Salmon, Jo ; Arundell, Lauren ; Ridgers, Nicola D ; Cerin, Ester ; Brown, Helen ; Hesketh, Kylie D ; Ball, Kylie ; Chinapaw, Mai ; Yildirim, Mine ; Daly, Robin M ; Dunstan, David W ; Crawford, David
  • Subjects: Australia ; Behavior ; Biomarkers ; Central business districts ; Child ; Children & youth ; Clinical trials ; Cluster Analysis ; Consent ; Diabetes ; Ecosystems ; Education ; Ethics ; Faculty ; Female ; Health Behavior ; Health promotion ; Humans ; Intervention ; Linear Models ; Male ; Methods ; Motor Activity ; Multilevel Analysis ; Nutrition research ; Parents ; Parents & parenting ; Physical fitness ; Schools ; Sedentary behavior ; Sedentary Lifestyle ; Socioeconomic Factors ; Studies ; System theory ; Treatment Outcome
  • Is Part Of: The international journal of behavioral nutrition and physical activity, 2013-05, Vol.10 (1), p.62-62, Article 62
  • Description: The optimal targets and strategies for effectively reducing sedentary behavior among young people are unknown. Intervention research that explores changes in mediated effects as well as in outcome behaviors is needed to help inform more effective interventions. Therefore, the purpose of this study was to examine the mid-intervention mediating effects on children's objectively assessed classroom and total weekday sedentary time in the Transform-Us! intervention. The results are based on 293 children, aged 7- to 9-years-old at baseline, from 20 schools in Melbourne, Australia. Each school was randomly allocated to one of four groups, which targeted reducing sedentary time in the school and family settings (SB; n = 74), increasing or maintaining moderate- to vigorous-intensity physical activity in the school and family settings (PA; n = 75), combined SB and PA (SB + PA; n = 80), or the current practice control (C; n = 64). Baseline and mid-intervention data (5-9 months) were collected in 2010 and analyzed in 2012. Classroom and total weekday sedentary time was objectively assessed using ActiGraph accelerometers. The hypothesized mediators including, child enjoyment, parent and teacher outcome expectancies, and child perceived access to standing opportunities in the classroom environment, were assessed by questionnaire. The SB + PA group spent 13.3 min/day less in weekday sedentary time at mid-intervention compared to the control group. At mid-intervention, children in the SB group had higher enjoyment of standing in class (0.9 units; 5-unit scale) and all intervention groups had more positive perceptions of access to standing opportunities in the classroom environment (0.3-0.4 units; 3-unit scale), compared to the control group. However, none of the hypothesized mediator variables had an effect on sedentary time; thus, no mediating effects were observed. While beneficial intervention effects were observed on some hypothesized mediating variables and total weekday sedentary time at mid-intervention, no significant mediating effects were found. Given the dearth of existing information, future intervention research is needed that explores mediated effects. More work is also needed on the development of reliable mediator measures that are sensitive to change overtime. ACTRN12609000715279. ISRCTN83725066.
  • Publisher: England: BioMed Central Ltd
  • Language: English
  • Identifier: ISSN: 1479-5868
    EISSN: 1479-5868
    DOI: 10.1186/1479-5868-10-62
    PMID: 23688180
  • Source: GFMER Free Medical Journals
    MEDLINE
    PubMed Central
    Springer Nature OA/Free Journals
    ProQuest Central
    DOAJ Directory of Open Access Journals
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