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23
identified one study(18) which assessed the associations between activity levels and
MetS specifically in minority youtha. That study,(18) which was conducted on a sample
of 4- to19-year-old Hispanic children and adolescents, demonstrated that
moderate-to-vigorous physical activity as measured by accelerometry was inversely
related to the number of risk factors of MetS. To inform development of interventions for
minority ethnic groups who are at greater metabolic risk, more studies on minority youth
are needed to assist in establishing the link between physical activity levels and MetS.
Another gap in the existing literature is that sedentary behavior has received less
attention than physical activity. As sedentary behavior is known to be associated with
progression toward MetS in adults,(53, 67) future research needs to understand this
relationship in youth. Another problem common to the literature on activity levels and
obesity(147) is that studies examining relationships between activity levels and MetS are
often confined to self-reported assessments of physical activity and sedentary behavior.
There is a lack of studies using objective measures of physical activity. Indeed, only three
pediatric studies identified used objectively measured physical activity (all measured by
acclerometry).(8, 57, 172) However, these studies were conducted on European youths
and little is known regarding activity levels and MetS in US minority youth.
a Another study was conducted in a predominantly minority adolescent sample. Walker at el.227 found no
association between physical activity and MetS in a racially/ethnically diverse adolescent sample from
NHANES [ Non-Hispanic Black (34%), Mexican American (38%), and Non-Hispanic White (28%)].
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 34 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 23 identified one study(18) which assessed the associations between activity levels and MetS specifically in minority youtha. That study,(18) which was conducted on a sample of 4- to19-year-old Hispanic children and adolescents, demonstrated that moderate-to-vigorous physical activity as measured by accelerometry was inversely related to the number of risk factors of MetS. To inform development of interventions for minority ethnic groups who are at greater metabolic risk, more studies on minority youth are needed to assist in establishing the link between physical activity levels and MetS. Another gap in the existing literature is that sedentary behavior has received less attention than physical activity. As sedentary behavior is known to be associated with progression toward MetS in adults,(53, 67) future research needs to understand this relationship in youth. Another problem common to the literature on activity levels and obesity(147) is that studies examining relationships between activity levels and MetS are often confined to self-reported assessments of physical activity and sedentary behavior. There is a lack of studies using objective measures of physical activity. Indeed, only three pediatric studies identified used objectively measured physical activity (all measured by acclerometry).(8, 57, 172) However, these studies were conducted on European youths and little is known regarding activity levels and MetS in US minority youth. a Another study was conducted in a predominantly minority adolescent sample. Walker at el.227 found no association between physical activity and MetS in a racially/ethnically diverse adolescent sample from NHANES [ Non-Hispanic Black (34%), Mexican American (38%), and Non-Hispanic White (28%)]. |
