Suzanna M Martinez1, Jeanne M Tschann2, Louise C Greenspan3, Julianna Deardorff4, Carlos Penilla4, Elena Flores5, Lauri A Pasch2, Steve E Gregorich6, Nancy F Butte7. 1. Division of General Pediatrics, University of CA, San Francisco, CA, USA. Electronic address: suzanna.martinez@ucsf.edu. 2. Department of Psychiatry, University of CA, San Francisco, CA, USA. 3. Kaiser Permanente, San Francisco, CA, USA. 4. School of Public Health, University of CA, Berkeley, CA, USA. 5. Department of Counseling Psychology, University of San Francisco, San Francisco, CA, USA. 6. School of Medicine, University of CA, San Francisco, CA, USA. 7. USDA/ARS Children Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
Abstract
OBJECTIVE: Cross-sectional studies show that sleep is related to childhood obesity. We aimed to examine the longitudinal impact of sleep on the risk of obesity in Mexican American children. DESIGN AND METHODS: We evaluated 229 Mexican American 8-10-year-olds and their mothers at baseline and at 12- and 24-month follow-ups. Sleep duration and anthropometrics were collected. Age- and gender-specific body mass index (BMI) z-scores (BMIz) were calculated based on Centers for Disease Control and Prevention guidelines. Sleep duration was estimated using accelerometry. Children were also categorized as long or short sleepers, using the National Sleep Foundation's recommendation to define adequate sleep duration (10-11 h for 5-12-year-olds). Using linear regressions, we examined whether sleep duration predicted BMIz, waist-to-height ratio (WHtR), and weight gain at 24 months. RESULTS: Children were mostly short sleepers (82%). Children who slept less were more likely to have a higher BMIz, WHtR, and weight gain at the 24-month follow-up (β = -0.07, P = 0.01; β = -0.11, P <0.01; and β = -0.14, P = 0.02, respectively), after controlling for baseline weight status, child gender, maternal BMI, and occupation. CONCLUSION: In Mexican American children, shorter sleep duration at baseline was associated with increased weight status over 24 months.
OBJECTIVE: Cross-sectional studies show that sleep is related to childhood obesity. We aimed to examine the longitudinal impact of sleep on the risk of obesity in Mexican American children. DESIGN AND METHODS: We evaluated 229 Mexican American 8-10-year-olds and their mothers at baseline and at 12- and 24-month follow-ups. Sleep duration and anthropometrics were collected. Age- and gender-specific body mass index (BMI) z-scores (BMIz) were calculated based on Centers for Disease Control and Prevention guidelines. Sleep duration was estimated using accelerometry. Children were also categorized as long or short sleepers, using the National Sleep Foundation's recommendation to define adequate sleep duration (10-11 h for 5-12-year-olds). Using linear regressions, we examined whether sleep duration predicted BMIz, waist-to-height ratio (WHtR), and weight gain at 24 months. RESULTS:Children were mostly short sleepers (82%). Children who slept less were more likely to have a higher BMIz, WHtR, and weight gain at the 24-month follow-up (β = -0.07, P = 0.01; β = -0.11, P <0.01; and β = -0.14, P = 0.02, respectively), after controlling for baseline weight status, child gender, maternal BMI, and occupation. CONCLUSION: In Mexican American children, shorter sleep duration at baseline was associated with increased weight status over 24 months.
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