Miller Harvey J, Tribby Calvin P, Brown Barbara B, Smith Ken R, Werner Carol M, Wolf Jean, Wilson Laura, Oliveira Marcelo G Simas
Department of Geography, The Ohio State University, 1036 Derby Hall/154 North Oval Mall, Columbus, OH 43210, USA; Center for Urban and Regional Analysis (CURA), The Ohio State University, USA.
Department of Geography, The Ohio State University, 1036 Derby Hall/154 North Oval Mall, Columbus, OH 43210, USA; Center for Urban and Regional Analysis (CURA), The Ohio State University, USA.
Health Place. 2015 Nov;36:8-17. doi: 10.1016/j.healthplace.2015.08.005. Epub 2015 Sep 1.
Poor health outcomes from insufficient physical activity (PA) are a persistent public health issue. Public transit is often promoted for positive influence on PA. Although there is cross-sectional evidence that transit users have higher PA levels, this may be coincidental or shifted from activities such as recreational walking. We use a quasi-experimental design to test if light rail transit (LRT) generated new PA in a neighborhood of Salt Lake City, Utah, USA. Participants (n=536) wore Global Positioning System (GPS) receivers and accelerometers before (2012) and after (2013) LRT construction. We test within-person differences in individuals' PA time based on changes in transit usage pre- versus post-intervention. We map transit-related PA to detect spatial clustering of PA around the new transit stops. We analyze within-person differences in PA time based on daily transit use and estimate the effect of daily transit use on PA time controlling for socio-demographic variables. Results suggest that transit use directly generates new PA that is not shifted from other PA. This supports the public health benefits from new high quality public transit such as LRT.
身体活动不足导致的健康不佳是一个长期存在的公共卫生问题。公共交通常常因对身体活动有积极影响而得到推广。尽管有横断面证据表明乘坐公共交通的人身体活动水平较高，但这可能是巧合，或者是从诸如休闲步行等活动转移而来的。我们采用准实验设计来测试轻轨交通（LRT）是否在美国犹他州盐湖城的一个社区产生了新的身体活动。参与者（n = 536）在轻轨建设前（2012年）和后（2013年）佩戴全球定位系统（GPS）接收器和加速度计。我们根据干预前后交通使用情况的变化来测试个体身体活动时间的个体内差异。我们绘制与交通相关的身体活动图，以检测新交通站点周围身体活动的空间聚集情况。我们根据每日交通使用情况分析个体身体活动时间的个体内差异，并在控制社会人口统计学变量的情况下估计每日交通使用对身体活动时间的影响。结果表明，乘坐公共交通直接产生了新的身体活动，而不是从其他身体活动转移而来的。这支持了诸如轻轨等新型高质量公共交通带来的公共卫生益处。
