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121
In Study 2, cross-sectional influences of physical activity and sedentary behavior on
MetS were examined in Latino and African American youth. Our findings demonstrated
that youth with MetS had lower levels of physical activity and higher levels of sedentary
behavior than those without. MVPA was inversely related to odds of developing MetS
and individual MetS features, while sedentary behavior was positively related to the odds
of developing MetS and individual MetS features, independent of body compositions. In
Study 2, both subjective (3DPAR) and objective (accelerometry) measures of activity
levels were utilized. Significant relationships were found between MVPA and MetS as
measured by accelerometry, while significant relationships between sedentary behavior
and MetS were found only with sedentary behavior as measured by self-report (3DPAR).
It seems that the accelerometer and 3DPAR might capture different components of
activity levels.
Study 3 explored the longitudinal impacts of baseline MetS on changes of physical
activity and sedentary behavior over one year between youth with and without MetS in a
sample of minority female peripubertal females. We found that MVPA declined on an
average of 2.17 minutes per quarterly measurement, while sedentary behavior increased
by 5.21 minutes per quarterly measurement over a year. On average, sedentary behavior
in youth with MetS increased by 23.42 minutes/per quarterly visit faster as compared to
those without. The unfavorable activity patterns predicted by MetS may be driven by a
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 132 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 121 In Study 2, cross-sectional influences of physical activity and sedentary behavior on MetS were examined in Latino and African American youth. Our findings demonstrated that youth with MetS had lower levels of physical activity and higher levels of sedentary behavior than those without. MVPA was inversely related to odds of developing MetS and individual MetS features, while sedentary behavior was positively related to the odds of developing MetS and individual MetS features, independent of body compositions. In Study 2, both subjective (3DPAR) and objective (accelerometry) measures of activity levels were utilized. Significant relationships were found between MVPA and MetS as measured by accelerometry, while significant relationships between sedentary behavior and MetS were found only with sedentary behavior as measured by self-report (3DPAR). It seems that the accelerometer and 3DPAR might capture different components of activity levels. Study 3 explored the longitudinal impacts of baseline MetS on changes of physical activity and sedentary behavior over one year between youth with and without MetS in a sample of minority female peripubertal females. We found that MVPA declined on an average of 2.17 minutes per quarterly measurement, while sedentary behavior increased by 5.21 minutes per quarterly measurement over a year. On average, sedentary behavior in youth with MetS increased by 23.42 minutes/per quarterly visit faster as compared to those without. The unfavorable activity patterns predicted by MetS may be driven by a |
