Page 141 |
Save page Remove page | Previous | 141 of 172 | Next |
|
small (250x250 max)
medium (500x500 max)
Large (1000x1000 max)
Extra Large
large ( > 500x500)
Full Resolution
All (PDF)
|
This page
All
|
130
Therefore, we suggest a larger sample size is needed to obtain valid estimations by
3DPAR.
Taken together, a combination of subjective and objective measures is
recommended to better understand activity levels. Considering that these two modalities
assess different aspects of activity levels, caution should be undertaken when attempting
to compare results across measurement modalities.
5.4 Overall Conclusions
This dissertation expands the current literature on obesity and MetS in at-risk
pediatric populations in China and in the United States. Findings from this dissertation
suggest a vicious cycle of increasing inactivity, obesity, and metabolic complications.
Such knowledge points to new directions for preventing obesity and improving metabolic
health in minority youth, and identifies the pivotal role of sedentary behavior. Future
effort should focus on the development of interventions that target reductions in
sedentariness , rather than targeting physical activity alone. Additionally, in light of the
rising rates of overweight and MetS in pediatric populations,(193) more attention should
be paid to youth with MetS. Given the precipitous annual increase in sedentary behavior
shown in peripubertal minority girls with MetS, it could be important to develop targeted
interventions to reduce sedentary behavior and increase physical activity in these
children. Lastly, since research on how MetS affects activity levels is still in its infancy,
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 141 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 130 Therefore, we suggest a larger sample size is needed to obtain valid estimations by 3DPAR. Taken together, a combination of subjective and objective measures is recommended to better understand activity levels. Considering that these two modalities assess different aspects of activity levels, caution should be undertaken when attempting to compare results across measurement modalities. 5.4 Overall Conclusions This dissertation expands the current literature on obesity and MetS in at-risk pediatric populations in China and in the United States. Findings from this dissertation suggest a vicious cycle of increasing inactivity, obesity, and metabolic complications. Such knowledge points to new directions for preventing obesity and improving metabolic health in minority youth, and identifies the pivotal role of sedentary behavior. Future effort should focus on the development of interventions that target reductions in sedentariness , rather than targeting physical activity alone. Additionally, in light of the rising rates of overweight and MetS in pediatric populations,(193) more attention should be paid to youth with MetS. Given the precipitous annual increase in sedentary behavior shown in peripubertal minority girls with MetS, it could be important to develop targeted interventions to reduce sedentary behavior and increase physical activity in these children. Lastly, since research on how MetS affects activity levels is still in its infancy, |
