Screen-based sedentary behavior and cardiorespiratory fitness from age 11 to 13.
Screen-based sedentary behavior and cardiorespiratory fitness from age 11 to 13.
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DOI：
10.1249/mss.0b013e318247cd73
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发表时间：
2012-07
影响因子：
4.1
通讯作者：
Blair SN
中科院分区：
文献类型：
--
作者：
Mitchell JA;Pate RR;Blair SN
旨在确定 11 至 13 岁儿童在屏幕久坐行为上花费的时间是否与心肺健康 (CRF) 水平的变化相关，并根据剧烈体力活动 (VPA) 进行调整。参与者是健康研究对照组的儿童 (n=2,097)，他们在 11 岁和 13 岁时进行了 20m 穿梭跑测试。自我报告的屏幕时间被用作久坐行为的衡量标准。纵向分位数回归用于模拟预测变量对第 10、25、50、75 和 90 个往返跑圈百分位数变化的影响。屏幕时间（小时/天）是主要预测因素，并且还对 VPA、体重指数和家庭教育进行了调整。对于男孩来说，更多的屏幕时间与 11 岁至 13 岁期间第 25、50 和 75 个往返跑圈数百分位数较少的往返跑圈数相关。最强的关联是在第 75 个往返跑百分位数（-0.57，95% CI：-0.93 至 -0.21）。对于女孩来说，在 11 岁至 13 岁期间，在第 50、75 和 90 个往返跑圈百分位数处，更多的屏幕时间与更少的往返跑圈数相关；最强的关联是在第 90 个往返跑百分位数（-0.65、-1.01 至 -0.30）。在男孩和女孩的第 10 个往返跑百分位数处，发现屏幕时间和往返跑圈数之间存在边界负相关（分别为 -0.28、-0.57 至 0.01 和 -0.17、-0.41 至 0.06）。 11 至 13 岁期间，更多的屏幕时间与较低的 CRF 相关，与 VPA 无关。然而，CRF 分布下尾部的相关性最弱。
To determine if time spent in screen-based sedentary behavior is associated with change in cardiorespiratory fitness (CRF) levels in children from age 11 to 13, adjusting for vigorous physical activity (VPA). Participants were children (n=2,097) enrolled in the control arm of the HEALTHY Study, who performed 20m shuttle run tests at ages 11 and 13. Self-reported screen time was used as a measure of sedentary behavior. Longitudinal quantile regression was used to model the influence of predictors on changes at the 10th, 25th, 50th, 75th and 90th shuttle run lap percentiles. Screen time (hrs/d) was the main predictor and adjustment was also made for VPA, body mass index and household education. In boys, more screen time was associated with fewer shuttle run laps completed from age 11 to 13 at the 25th, 50th and 75th shuttle run lap percentiles; the strongest association was at the 75th shuttle run percentile (-0.57, 95% CI: -0.93 to -0.21). In girls, more screen time was associated with fewer shuttle run laps completed from age 11 to 13 at the 50th, 75th and 90th shuttle run lap percentiles; the strongest association was at the 90th shuttle run percentile (-0.65, -1.01 to -0.30). Borderline negative associations were found between screen time and shuttle run laps at the 10th shuttle run percentile in boys and girls (-0.28, -0.57 to 0.01 and -0.17, -0.41 to 0.06, respectively). More screen time was associated with lower CRF from age 11 to 13, independent of VPA. However, the association was weakest at the lower tail of the CRF distribution.