The association of physical activity, sedentary behaviors, and body mass index classification in a cross-sectional analysis: are the effects homogenous?
The association of physical activity, sedentary behaviors, and body mass index classification in a cross-sectional analysis: are the effects homogenous?
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DOI：
10.1186/1471-2458-11-926
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发表时间：
2011-12-14
影响因子：
4.5
通讯作者：
Ory, Marcia G.
中科院分区：
文献类型：
--
作者：
Dickerson, Justin B.;Smith, Matthew Lee;Ory, Marcia G.
背景：虽然人们对体育活动（PA）的益处和久坐行为对身体质量指数（BMI）的影响了解很多，但对这些影响在个体之间的同质性知之甚少。本研究的目的是确定PA和久坐行为对所有BMI分类的个体是否有相同的影响。方法：分析来自社区健康评估的数据，并选择样本，包括自我报告患有与肥胖相关的慢性疾病的受访者（n = 2,840）。描述性统计用于描述所选自变量与BMI之间的关联。采用同步分位数回归来确定人口统计学自变量、每周中度PA的分钟数和每天看电视的小时数对BMI分类的影响的同质程度。在使用同步分位数回归的研究中，“效应”一词用于描述关联，而不是因果关系。结果：每周几分钟的适度PA对较低的BMI有显著影响，但只有当受访者至少被归类为肥胖I级时（β = -0.001, p = 0.006）。当被调查者被分类为肥胖II类与肥胖I类时，中度PA对低BMI的影响变化显著增加（F = 4.54, p = 0.033）。每天花几个小时看电视对较高的BMI有显著影响，但只有当被调查者至少被归类为超重时（beta = 0.87, p < 0.001）。当被调查者被归类为肥胖I级与超重时，看电视对高BMI的影响变化显著增加（F = 5.57, p = 0.018）。结论：肥胖个体的PA和看电视与BMI的关系大于单纯超重个体。应针对特定的BMI分类制定定制的干预措施，以最大限度地提高公共卫生效益。
Background: While much is known about the benefits of physical activity (PA) and the consequence of sedentary behaviors relative to body mass index (BMI), little is known about the homogeneity of these effects across individuals. The goal of this study was to determine if PA and sedentary behaviors have the same effect on individuals of all BMI classifications.Methods: Data from a community health assessment were analyzed and a sample was selected to include respondents who self-reported a chronic disease associated with obesity (n = 2,840). Descriptive statistics were used to describe the association between selected independent variables and BMI. Simultaneous quantile regression was used to identify the degree of homogeneity in the effect of demographic independent variables, minutes per week of moderate PA, and hours per day spent watching television on BMI classification. In studies using simultaneous quantile regression, the word "effect" is used to describe association, not causation.Results: Minutes per week of moderate PA had a significant effect on lower BMI, but only when respondents were at least classified as obese-class I (beta = -0.001, p = 0.006). The change in effect of moderate PA in lower BMI increased significantly when respondents were classified as obese-class II versus obese-class I (F = 4.54, p = 0.033). Hours per day spent watching television had a significant effect on higher BMI, but only when the respondent was at least classified as overweight (beta = 0.87, p < 0.001). The change in effect of watching television on higher BMI increased significantly when respondents were classified as obese-class I versus overweight (F = 5.57, p = 0.018).Conclusion: PA and watching television were more related to BMI for obese individuals than those who were just overweight. Customized interventions for specific BMI classifications should be developed to maximize public health benefits.