Department of Public Health and Primary Care, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium.
Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Melbourne, VIC 3125, Australia.
Int J Environ Res Public Health. 2020 Sep 15;17(18):6708. doi: 10.3390/ijerph17186708.
: Sedentary behaviour guidelines recommend that individuals should regularly break up sitting time. Accurately monitoring such breaks is needed to inform guidelines concerning how regularly to break up sitting time and to evaluate intervention effects. We investigated the concurrent validity of three "UP4FUN child questionnaire" items assessing the number of breaks in sitting time among children and adolescents. : Fifty-seven children and adolescents self-reported number of breaks from sitting taken at school, while watching TV, and during other screen time activities. Participants also wore an activPAL monitor (PAL Technologies, Glasgow, UK) to objectively assess the number of sitting time breaks (frequency/hour) during the school period and the school-free period (which was divided in the periods "after school" and "during the evening"). Concurrent validity was assessed using Spearman rank correlations. : Self-reported number of breaks/hour at school showed good concurrent validity (ρ = 0.676). Results were moderate to good for self-reported number of breaks/hour while watching TV (ρ range for different periods: 0.482 to 0.536) and moderate for self-reported number of breaks/hour in total screen time (ρ range for different periods: 0.377 to 0.468). Poor concurrent validity was found for self-reported number of breaks/hour during other screen time activities (ρ range for different periods: 0.157 to 0.274). Conclusions: Only the questionnaire items about number of breaks at school and while watching TV appear to be acceptable for further use in research focussing on breaks in prolonged sitting among children and adolescents.
：久坐行为指南建议个人应定期打断久坐时间。准确监测这些休息时间对于告知有关应多频繁打断久坐时间的指南以及评估干预效果非常重要。我们调查了三种“UP4FUN 儿童问卷”项目评估儿童和青少年久坐时间休息次数的同时效度。：五十七名儿童和青少年自我报告了在学校、看电视和其他屏幕时间活动期间的休息次数。参与者还佩戴了 activPAL 监测器（格拉斯哥 PAL 技术公司，英国）以客观评估学校期间和学校休息期间（分为“放学后”和“晚上”两个时间段）的久坐时间休息次数（频率/小时）。同时效度通过 Spearman 等级相关进行评估。：自我报告的学校每小时休息次数显示出良好的同时效度（ρ=0.676）。自我报告的看电视每小时休息次数的结果为中度至良好（不同时间段的 ρ 范围为 0.482 至 0.536），而总屏幕时间每小时休息次数的结果为中度（不同时间段的 ρ 范围为 0.377 至 0.468）。其他屏幕时间活动中自我报告的每小时休息次数的同时效度较差（不同时间段的 ρ 范围为 0.157 至 0.274）。结论：仅关于在学校和看电视时休息次数的问卷项目似乎可进一步用于研究儿童和青少年久坐时间休息。
