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112
4.5 CONCLUSIONS
Despite the above limitations, this is the first longitudinal study to demonstrate that
MetS leads to adverse activity patterns in minority girls. Our findings suggest a vicious
cycle of inactivity and metabolic complications. Overweight status and other metabolic
health issues such as MetS might lead to low activity levels and increased sedentary
behaviors, triggering a spiral of health risk and health risk behavior. This offers a more
comprehensive explanation for the associations between metabolic health and activity
levels, accounting for pubertal development and the accompanying behavioral and
metabolic changes that occur at this time. 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. The combination of the psychosocial, physical, and biological
mechanisms involved in obesity and MetS may contribute to an increase of sedentary
behavior in youth. Future research that incorporates longitudinal designs in large and
diverse populations with multiple follow-ups for metabolic health, activity levels, and
psychosocial correlates are needed to uncover mechanisms by which MetS might
influence sedentary behavior and physical activity over time.
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 123 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 112 4.5 CONCLUSIONS Despite the above limitations, this is the first longitudinal study to demonstrate that MetS leads to adverse activity patterns in minority girls. Our findings suggest a vicious cycle of inactivity and metabolic complications. Overweight status and other metabolic health issues such as MetS might lead to low activity levels and increased sedentary behaviors, triggering a spiral of health risk and health risk behavior. This offers a more comprehensive explanation for the associations between metabolic health and activity levels, accounting for pubertal development and the accompanying behavioral and metabolic changes that occur at this time. 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. The combination of the psychosocial, physical, and biological mechanisms involved in obesity and MetS may contribute to an increase of sedentary behavior in youth. Future research that incorporates longitudinal designs in large and diverse populations with multiple follow-ups for metabolic health, activity levels, and psychosocial correlates are needed to uncover mechanisms by which MetS might influence sedentary behavior and physical activity over time. |
