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53
hence, the findings may not generalizable to those without complete data. Fourth, in order
to keep the survey short, assessments of some constructs relied on a small number of
items.
2.5 CONCLUSIONS
This study contributes new information on the modifiable determinants of overweight
that could be targeted for interventions in Chinese youth. Our results indicate that, in
keeping with findings in Western populations,(6, 38, 121) both short sleep duration per
night and greater time spent in sedentary activities were significant risk factors for
overweight. Therefore, interventions to decrease sedentary behaviors and improve sleep
habits may be promising approaches for preventing pediatric overweight. In contrast with
what has been found among Western youth, we found that overweight Chinese youth
were male, were younger, participated more in VPA, had higher SES, a greater intake of
vegetables, and a lower intake of sweets and fast food. This ‘East-West paradox’ might
be driven by rapid shifts in the economic climate in China that makes attractive yet
unhealthy lifestyle and behavioral choices available primarily to the wealthy and
educated population. As the Chinese economy continues to grow, it is crucial to track
these paradoxical relationships, which may or may not ‘flip’ to match relationships we
now see in Western countries. The problem of pediatric overweight in China is complex,
and it is due, in part, to cultural phenomena specific to China. Beyond the prevention
strategies learned from Western countries, solutions to the pediatric obesity epidemic 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 64 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 53 hence, the findings may not generalizable to those without complete data. Fourth, in order to keep the survey short, assessments of some constructs relied on a small number of items. 2.5 CONCLUSIONS This study contributes new information on the modifiable determinants of overweight that could be targeted for interventions in Chinese youth. Our results indicate that, in keeping with findings in Western populations,(6, 38, 121) both short sleep duration per night and greater time spent in sedentary activities were significant risk factors for overweight. Therefore, interventions to decrease sedentary behaviors and improve sleep habits may be promising approaches for preventing pediatric overweight. In contrast with what has been found among Western youth, we found that overweight Chinese youth were male, were younger, participated more in VPA, had higher SES, a greater intake of vegetables, and a lower intake of sweets and fast food. This ‘East-West paradox’ might be driven by rapid shifts in the economic climate in China that makes attractive yet unhealthy lifestyle and behavioral choices available primarily to the wealthy and educated population. As the Chinese economy continues to grow, it is crucial to track these paradoxical relationships, which may or may not ‘flip’ to match relationships we now see in Western countries. The problem of pediatric overweight in China is complex, and it is due, in part, to cultural phenomena specific to China. Beyond the prevention strategies learned from Western countries, solutions to the pediatric obesity epidemic in |
