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7
obesity rates and the lack of knowledge about this population puts Chinese youth at
increased risk. Hence, to fill the gaps in the existing literature, the proposed Study 1 will
investigate the associations between weight-related correlates and overweight status in
Chinese youth.
Obesity Risk in Chinese Adolescents and Public Health Implications
Despite the fact that Asian populations have a lower BMI than other ethnic
minorities,(45, 79, 224) they are at increased risk of obesity-related diseases(74) and have
a 60% higher rate of Type Ⅱ diabetes than Non-Hispanic Whites with the same
BMI.(133) In addition, Asian populations have higher visceral fat, a risk factor for
cardiovascular disease and Type Ⅱ diabetes, with adjustments for age and total body
fat.(160) Previous research has indicated that Chinese populations have higher amounts
of body fat at lower BMIs and waist circumferences than do Western populations.(222)
This, coupled with the upward trend in overweight and obesity has led to the increasing
development of chronic diseases.(238) Therefore, assessing factors contributing to
obesity in this population is urgently needed.
In addition to these adverse impacts on health, obesity in China has led to a growing
economic burden.(213) In 2003, estimates of the direct medical cost attributable to
overweight and obesity amounted to 21.11 billion Yuan (RMB) (equivalent to $2.74 U.S.
billion) accounting for 25.5% of the total direct medical costs of the four major chronic
diseases (hypertension, diabetes, coronary heart disease and stroke), or 3.7% of national
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 18 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 7 obesity rates and the lack of knowledge about this population puts Chinese youth at increased risk. Hence, to fill the gaps in the existing literature, the proposed Study 1 will investigate the associations between weight-related correlates and overweight status in Chinese youth. Obesity Risk in Chinese Adolescents and Public Health Implications Despite the fact that Asian populations have a lower BMI than other ethnic minorities,(45, 79, 224) they are at increased risk of obesity-related diseases(74) and have a 60% higher rate of Type Ⅱ diabetes than Non-Hispanic Whites with the same BMI.(133) In addition, Asian populations have higher visceral fat, a risk factor for cardiovascular disease and Type Ⅱ diabetes, with adjustments for age and total body fat.(160) Previous research has indicated that Chinese populations have higher amounts of body fat at lower BMIs and waist circumferences than do Western populations.(222) This, coupled with the upward trend in overweight and obesity has led to the increasing development of chronic diseases.(238) Therefore, assessing factors contributing to obesity in this population is urgently needed. In addition to these adverse impacts on health, obesity in China has led to a growing economic burden.(213) In 2003, estimates of the direct medical cost attributable to overweight and obesity amounted to 21.11 billion Yuan (RMB) (equivalent to $2.74 U.S. billion) accounting for 25.5% of the total direct medical costs of the four major chronic diseases (hypertension, diabetes, coronary heart disease and stroke), or 3.7% of national |
