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125
seen in countries in an early stage of socioeconomic development. Nevertheless, the
obesity burden could shift to lower SES groups, as the country’s gross national product
(GNP) rises. Taken together, these findings suggest that a nation’s development stage
may moderate the relationships between SES and obesity. This idea creates an important
perspective that weight-related correlates (e.g., SES, ethnicity, nation’s economic
development stage) could interact to influence obesity. Relevant examples have been
described elsewhere.(24) For example, the interaction between SES and ethnicity on
obesity had been documented in a recent report. In this study, the inverse SES-obesity
relationship was found to vary across ethnic groups.(156) In summary, results from Study
1 suggest that caution should be used when translating findings across cultures and
socioeconomic development stages. More specifically, the SES-obesity association is
dynamic and more complicated in developing societies undergoing rapid economic
growth. Obesity prevention and treatment should be culturally appropriate and consider
the socio-economical aspects of the target population to enhance its effectiveness. Aside
from the direct influences of correlates on obesity, future research should also consider
the inter-relationships between these correlates and how they interact to affect obesity
risk.
Usefulness of regular MetS screening to reduce future disease risk in youth
The adverse impact that MetS was found to have on sedentary behavior (Study 3)
has three clinical implications. It suggests that screening for MetS on a regular basis in
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 136 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 125 seen in countries in an early stage of socioeconomic development. Nevertheless, the obesity burden could shift to lower SES groups, as the country’s gross national product (GNP) rises. Taken together, these findings suggest that a nation’s development stage may moderate the relationships between SES and obesity. This idea creates an important perspective that weight-related correlates (e.g., SES, ethnicity, nation’s economic development stage) could interact to influence obesity. Relevant examples have been described elsewhere.(24) For example, the interaction between SES and ethnicity on obesity had been documented in a recent report. In this study, the inverse SES-obesity relationship was found to vary across ethnic groups.(156) In summary, results from Study 1 suggest that caution should be used when translating findings across cultures and socioeconomic development stages. More specifically, the SES-obesity association is dynamic and more complicated in developing societies undergoing rapid economic growth. Obesity prevention and treatment should be culturally appropriate and consider the socio-economical aspects of the target population to enhance its effectiveness. Aside from the direct influences of correlates on obesity, future research should also consider the inter-relationships between these correlates and how they interact to affect obesity risk. Usefulness of regular MetS screening to reduce future disease risk in youth The adverse impact that MetS was found to have on sedentary behavior (Study 3) has three clinical implications. It suggests that screening for MetS on a regular basis in |
