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75
MetS while higher levels of physical activity would be protective against MetS.
Differences in relationships between MetS and activity levels by measurement modality
were examined.
3.2 METHODS
Participants
Data for this sample was taken from baseline measures in three related pediatric
obesity studies that share a set of common methods and measures: TRANSITIONS
(Insulin Resistance and Declining Physical Activity Levels in African American and
Latina girls), SANO (Strength and Nutrition Outcomes for Latino Adolescents), and
STAND (Strength Training and Nutrition Development in African American Youth). Of
187 participants who completed a baseline visit, 7 were missing for activity data by
3DPAR and 75 were missing for activity data by accelerometry. The final sample
therefore consisted of 105 participants (Latino 74.3%, female 75.2%, 13±3 years) who
have completed responses to both 3DPAR and accelerometry.
Participants were recruited through medical clinics, churches, community centers,
local schools, and advertisements in Los Angeles County. Detailed methods for these
studies have been published previously.(43, 154, 210) Participants were excluded if they
were using a medication or had been diagnosed with a condition known to influence body
composition, fat distribution, or insulin/glucose metabolism or if they had been diagnosed
with diabetes by fasting plasma glucose (³ 126 mg/dl) at the time of entry to the study.
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 86 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 75 MetS while higher levels of physical activity would be protective against MetS. Differences in relationships between MetS and activity levels by measurement modality were examined. 3.2 METHODS Participants Data for this sample was taken from baseline measures in three related pediatric obesity studies that share a set of common methods and measures: TRANSITIONS (Insulin Resistance and Declining Physical Activity Levels in African American and Latina girls), SANO (Strength and Nutrition Outcomes for Latino Adolescents), and STAND (Strength Training and Nutrition Development in African American Youth). Of 187 participants who completed a baseline visit, 7 were missing for activity data by 3DPAR and 75 were missing for activity data by accelerometry. The final sample therefore consisted of 105 participants (Latino 74.3%, female 75.2%, 13±3 years) who have completed responses to both 3DPAR and accelerometry. Participants were recruited through medical clinics, churches, community centers, local schools, and advertisements in Los Angeles County. Detailed methods for these studies have been published previously.(43, 154, 210) Participants were excluded if they were using a medication or had been diagnosed with a condition known to influence body composition, fat distribution, or insulin/glucose metabolism or if they had been diagnosed with diabetes by fasting plasma glucose (³ 126 mg/dl) at the time of entry to the study. |
