Journal Article

Sedentary behavior and subclinical atherosclerosis in African Americans: cross-sectional analysis of the Jackson heart study

Hooker, Steven P, Muntner, Paul, Sims, Mario, Shimbo, Daichi, Dubbert, Patricia M, Diaz, Keith M, Seals, Samantha R, Booth, John N., III

2016

Overview

BACKGROUND: Previous studies have reported conflicting results as to whether an association exists between sedentary time and cardiovascular disease (CVD) risk among African Americans. These studies, however, were limited by lack of consideration of sedentary behavior in leisure versus non-leisure settings. To elucidate this relation, we investigated the associations of television (TV) viewing time and occupational sitting with carotid intima-media thickness (CIMT), a subclinical atherosclerosis measure, in a community-based sample of African Americans. METHODS: We studied 3410 participants from the Jackson Heart Study, a single-site, community-based study of African Americans residing in Jackson, MS. CIMT was assessed by ultrasonography and represented mean far-wall thickness across right and left sides of the common carotid artery. TV viewing time, a measure of leisure sedentary behavior, and occupational sitting, a measure of non-leisure sedentary behavior, were assessed by questionnaire. RESULTS: In a multivariable regression model that included physical activity and CVD risk factors, longer TV viewing time (2–4 h/day and >4 h/day) was associated with greater CIMT (adjusted mean ± SE difference from referent [<2 h/day] of 0.009 ± 0.008 mm for 2–4 h/day, and 0.028 ± 0.009 mm for >4 h/day; P-trend =0.001). In contrast, more frequent occupational sitting (‘sometimes’ and ‘often/always’) was associated with lower CIMT (adjusted mean ± SE difference from referent [‘never/seldom’]:−0.021 ± 0.009 mm for ‘sometimes’, and−0.018 ± 0.008 mm for ‘often/always’; P-trend = 0.042). CONCLUSIONS: Longer TV viewing time was associated with greater CIMT, while occupational sitting was associated with lower CIMT. These findings suggest the role of sedentary behaviors in the pathogenesis of CVD among African Americans may vary by whether individuals engage in leisure versus non-leisure sedentary behaviors.

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V
• Subject: African Americans / African Americans - statistics & numerical data / Atherosclerosis / Atherosclerosis - epidemiology / Behavior modification / Behavioral Sciences / Care and treatment / carotid arteries / Carotid Intima-Media Thickness / Clinical Nutrition / Cross-Sectional Studies / Data collection / Diagnosis / Exercise / Female / Health aspects / Health Promotion and Disease Prevention / Health risk assessment / Heart / Humans / Leisure / Male / Medicine / Medicine & Public Health / Middle Aged / Mississippi - epidemiology / Mortality / pathogenesis / physical activity / Physical fitness / questionnaires / regression analysis / risk factors / Sedentary behavior / Sedentary Lifestyle - ethnology / Studies / television / ultrasonography / Ultrasound imaging