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35
(SES) and overweight prevalence has been found in China.(99) Previous research
suggests that overweight epidemic in China may partially be attributed to a widespread of
social belief that overweight represents health and prosperity in Chinese culture.(227)
A healthy diet and physical activity have long been emphasized as two important
strategies for the prevention of obesity.(103) Studies conducted in Western societies also
show consistently that diet, physical activity, and sedentary behaviors are lifestyle factors
that significantly influence weight status.(166) Associations between these lifestyle
factors and weight status was examined in a sample of U.S. Latino and African American
youth (from the proposed Study 2) and a higher level of moderate-to-vigorous physical
activity was found to be related to body fat mass ( =-0.12, P=0.02). In China, the
adoption of an open-market policy and rapid economical growth have led to major shifts
in individual dietary patterns.(176) Not only scarcity of food has been reduced on a
national level, but also average food consumption has increased.(168) In the wake of
these changes, adolescents have begun to consume more energy dense and nutrient poor
foods.(50) Coinciding with China’s increasing industrialization are shifts in physical
activity behaviors.(29) Increased household automobile ownership and the affordability
of TV and computers have been linked to reductions in physical activity(30) and
increases in sedentary behavior(122) among Chinese youth.
Sleep is another lifestyle factor that has been linked with overweight.(27) Growing
evidence of an association between a insufficient sleep and overweight is coming out of
Object Description
| Title | The vicious cycle of inactivity, obesity, and metabolic health consequences in at-risk pediatric populations |
| Author | Hsu, Ya-Wen |
| Author email | ywxxbirdy@yahoo.com; yawenhsu@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Preventive Medicine (Health Behavior) |
| School | Keck School of Medicine |
| Date defended/completed | 2011-03-09 |
| Date submitted | 2011 |
| Restricted until | Restricted until 26 Apr. 2012. |
| Date published | 2012-04-26 |
| Advisor (committee chair) |
Chou, Chih-Ping Spruijt-Metz, Donna |
| Advisor (committee member) |
Unger, Jennifer B. Azen, Stanley Paul Palinkas, Lawrence A. |
| Abstract | PURPOSE: This dissertation examined the associations between physical activity, sedentary behavior, overweight, and the metabolic syndrome (MetS) in at-risk pediatric populations in the United States and in China. Study 1 identified the independent influences of physical activity, sedentary behavior, and other weight-related correlates on overweight status in Chinese youth. Study 2 explored the influences of physical activity and sedentary behavior on MetS in US minority youth. Study 3 compared the longitudinal trends of physical activity and sedentary behavior between youth with and without MetS in a sample of US minority female youth.; METHODS: Participants were youth (ages 8-18 years) in the United States and in China. Study 1 used baseline data from of a longitudinal smoking prevention and health promotion study conducted in the 7 large cities in China for Chinese youth ages 11-18 years. Study 2 used baseline data from three related pediatric obesity studies that share a set of common methods and measures (US Latino and African American youth ages 8-18 years). Data for Study 3 are from a longitudinal, observation study for Latina and African American female youth ages 8-11 years at baseline.; RESULTS: In Study 1, Chinese youth were more likely to be overweight if they spent more time being sedentary, slept <7 hours/night, were male, were younger, participated more in vigorous physical activity, had higher levels of parental education, better self-perceived health status, a higher frequency of vegetable intake, and a lower frequency of sweet/fast food intake. In Study 2, lower levels of moderate-to-vigorous physical activity (by accelerometry) and higher levels of sedentary behavior (by 3-day physical activity recall) are associated with increased the metabolic risk independent of each other and body composition. In Study 3, a significant decline in MVPA and an increase in sedentary behavior were observed over one year. Sedentary behavior as measured by accelerometry increased 23.42 minutes/per quarterly visit, adding up to 93.68 minutes/per year more in youth with MetS than in those without.; CONCLUSION: Overweight-related correlates seem to play different roles in the Chinese culture than in Western cultures. Findings from this dissertation support a vicious cycle of increasing inactivity, obesity, and metabolic complications. These findings, coupled with longitudinal evidence of the effects of activity levels on obesity and MetS, suggests that physical activity and sedentary behavior could function as antecedents as well as consequences of overweight or MetS in youth. |
| Keyword | Chinese youth; metabolic syndrome; minority youth; obesity; physical activity; sedentary behavior |
| Geographic subject (country) | USA; China |
| Coverage date | 1970/2010 |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m3779 |
| Contributing entity | University of Southern California |
| Rights | Hsu, Ya-Wen |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Hsu-4455 |
| Archival file | uscthesesreloadpub_Volume23/etd-Hsu-4455.pdf |
Description
| Title | Page 46 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 35 (SES) and overweight prevalence has been found in China.(99) Previous research suggests that overweight epidemic in China may partially be attributed to a widespread of social belief that overweight represents health and prosperity in Chinese culture.(227) A healthy diet and physical activity have long been emphasized as two important strategies for the prevention of obesity.(103) Studies conducted in Western societies also show consistently that diet, physical activity, and sedentary behaviors are lifestyle factors that significantly influence weight status.(166) Associations between these lifestyle factors and weight status was examined in a sample of U.S. Latino and African American youth (from the proposed Study 2) and a higher level of moderate-to-vigorous physical activity was found to be related to body fat mass ( =-0.12, P=0.02). In China, the adoption of an open-market policy and rapid economical growth have led to major shifts in individual dietary patterns.(176) Not only scarcity of food has been reduced on a national level, but also average food consumption has increased.(168) In the wake of these changes, adolescents have begun to consume more energy dense and nutrient poor foods.(50) Coinciding with China’s increasing industrialization are shifts in physical activity behaviors.(29) Increased household automobile ownership and the affordability of TV and computers have been linked to reductions in physical activity(30) and increases in sedentary behavior(122) among Chinese youth. Sleep is another lifestyle factor that has been linked with overweight.(27) Growing evidence of an association between a insufficient sleep and overweight is coming out of |
