BACKGROUND Each day is made up of a composition of ‘time-use behaviours’. These can be classified by their intensity (e.g., light or moderate-vigorous physical activity (PA)) or domain (e.g., chores, socialising). Intensity-based time-use behaviours are linked with cognitive function and cardiometabolic health in older adults, but it is unknown whether these relationships differ depending on the domain (or type/context) of behaviour. METHODS This study included 397 older adults (65.5 ± 3.0 years, 69% female, 16.0 ± 3.0 years education) from Adelaide and Newcastle, Australia. Time-use behaviours were recorded using the Multimedia Activity Recall for Children and Adults (MARCA), cognitive function was measured using the Addenbrooke’s Cognitive Examination III (ACE-III) and Cambridge Neuropsychological Test Automated Battery (CANTAB), and systolic and diastolic blood pressure, total cholesterol and waist-hip ratio were also recorded. Two 24-hr time-use compositions were derived from each participant’s MARCA, including a four-part intensity composition (sleep, sedentary behaviour, light and moderate-vigorous PA) and an eight-part domain composition (Sleep, Self-Care, Chores, Screen Time, Quiet Time, Household Administration, Sport/Exercise, and Social). RESULTS Linear regressions found significant associations between the domain composition and both ACE-III (p=0.010) and waist-hip ratio (p=0.009), and between the intensity composition and waist-hip ratio (p=0.025). Isotemporal substitution modelling demonstrated that the domains of sedentary behaviours and PA impacted their associations with ACE-III, whilst any PA appeared beneficial for waist-hip ratio. CONCLUSIONS Findings suggest the domain of behaviour should be considered when aiming to support cognitive function, whereas for cardiometabolic health, it appears sufficient to promote any type of PA

中文翻译：

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我们应该为了我们的健康更聪明还是更努力地工作？基于强度和域的时间使用成分的比较及其与认知和心脏代谢健康的关联


背景 每一天都由“时间使用行为”组成。这些可以根据其强度（例如，轻度或中度剧烈的体力活动 （PA））或领域（例如，家务、社交）进行分类。基于强度的时间使用行为与老年人的认知功能和心脏代谢健康有关，但尚不清楚这些关系是否因行为的领域（或类型/背景）而异。方法 本研究包括来自阿德莱德和澳大利亚斯卡斯尔的 397 名老年人 （65.5 ± 3.0 岁，69% 为女性，16.0 ± 3.0 年受教育程度）。使用儿童和成人多媒体活动回忆 （MARCA） 记录时间使用行为，使用 Addenbrooke 认知检查 III （ACE-III） 和剑桥神经心理学测试自动电池 （CANTAB） 测量认知功能，还记录收缩压和舒张压、总胆固醇和腰臀比。每个参与者的 MARCA 得出两个 24 小时的时间使用组合，包括一个由四部分组成的强度组合（睡眠、久坐行为、轻度和中等强度的 PA）和一个由八部分组成的领域组合（睡眠、自我照顾、家务、屏幕时间、安静时间、家庭管理、运动/锻炼和社交）。结果 线性回归分析发现，结构域组成与 ACE-III （p = 0.010） 和腰臀比 （p = 0.009） 以及强度组成与腰臀比 （p = 0.025） 之间存在显著关联。等时区替代模型表明，久坐行为和 PA 的领域会影响它们与 ACE-III 的关联，而任何 PA 似乎都有利于腰臀比。结论 研究结果表明，在旨在支持认知功能时应考虑行为领域，而对于心脏代谢健康，它似乎足以促进任何类型的 PA