Duke University Medical Center, Department of Community and Family Medicine, Durham, NC, USA.
Int J Behav Nutr Phys Act. 2011 Mar 8;8:17. doi: 10.1186/1479-5868-8-17.
Studies on parent-child correlations of physical activity have been mixed. Few studies have examined concurrent temporal patterns of physical activity and sedentary behaviors in parents and children using direct measures. The purpose of this study was to examine parent-child activity correlations by gender, day of week, and time of day, using accelerometers - a method for direct assessment of physical activity.
Accelerometers were used to assess physical activity and sedentary time in 45 fathers, 45 mothers and their children (23 boys, 22 girls, mean age 9.9 years) over the course of 4 days (Thursday - Sunday). Participants were instructed to wear accelerometers for 24 hours per day. Data from accelerometers were aggregated into waking hours on weekdays and weekends (6:00 am to midnight) and weekday after-school hours (3:00 - 7:00 pm).
Across the 4 days, the mean minutes per day of moderate-to-vigorous physical activity (MVPA) for fathers was 30.0 (s.d. = 17.3), for mothers was 30.1 (s.d. = 20.1) and for children was 145.47 (s.d. = 51.64). Mothers' and fathers' minutes of MVPA and minutes of sedentary time were positively correlated with child physical activity and sedentary time (all ps < .05, with the exception of mothers' and children's sedentary time on weekdays from 6 am to 12 am). Multivariate linear regression analyses resulted in significant effects between parents and children for MVPA across all time segments. For sedentary activity, significant associations were observed only between father and child on the weekend. Sedentary activity of parents and children were not related for other time segments. Models examining the associations of one or two parents with high levels of MVPA or sedentary time indicated a dose response increase in child activity relative to parent.
Greater parental MVPA was associated with increased child MVPA. In addition, having two parents with higher levels of MVPA was associated with greater levels of activity in children. Sedentary time in children was not as strongly correlated with that of their parents. Findings lend support to the notion that to increase childhood activity levels it may be fruitful to improve physical activity among parents.
关于体力活动的亲子相关性的研究结果不一。很少有研究使用直接测量方法同时检查父母和孩子的体力活动和久坐行为的同期时间模式。本研究的目的是使用加速度计（一种直接评估体力活动的方法）按性别、一周中的哪一天和一天中的什么时间检查亲子活动相关性。
使用加速度计在四天（周四至周日）内评估 45 位父亲、45 位母亲及其子女（23 名男孩，22 名女孩，平均年龄 9.9 岁）的体力活动和久坐时间。参与者被要求每天佩戴加速度计 24 小时。从加速度计中收集的数据汇总为工作日和周末（上午 6 点至午夜）以及工作日放学后时段（下午 3 点至 7 点）的清醒时间。
在四天中，父亲的中等到剧烈体力活动（MVPA）的平均每天分钟数为 30.0（标准差= 17.3），母亲为 30.1（标准差= 20.1），孩子为 145.47（标准差= 51.64）。母亲和父亲的 MVPA 分钟数和久坐时间与孩子的体力活动和久坐时间呈正相关（所有 p 值均<.05，母亲和孩子在工作日从上午 6 点到 12 点的久坐时间除外）。多元线性回归分析得出，在所有时间段，父母与孩子之间 MVPA 存在显著影响。对于久坐活动，仅在周末观察到父母与孩子之间存在显著关联。父母和孩子的久坐活动在其他时间段没有关联。检查一位或两位父母与高水平 MVPA 或久坐时间相关联的模型表明，相对于父母，孩子的活动水平呈剂量反应增加。
父母的 MVPA 越高，孩子的 MVPA 越高。此外，父母双方的 MVPA 水平较高与孩子的活动水平较高相关。孩子的久坐时间与父母的久坐时间相关性不强。研究结果支持这样一种观点，即要提高儿童的活动水平，提高父母的身体活动水平可能会有所帮助。
