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Contact: Nathaniel Dunford
American Thoracic Society
ATS 2012, SAN FRANCISCO Weight loss improved both metabolic parameters and sleep-disordered breathing (SDB) in obese children in a new study from researchers in Belgium, confirming links between metabolic dysregulation, SDB and obesity.
“SDB is highly prevalent in childhood obesity, and may be a risk factor for the metabolic syndrome. In our population of 224 obese children and adolescents, 30% had SDB, which was significantly correlated with metabolic parameters, including aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT) and HDL cholesterol at baseline,” said Stijn Verhulst, MD, MSc, PhD, coordinator of the pediatric sleep lab at the Antwerp University Hospital, Belgium. “After weight loss, all metabolic parameters improved, and just 24% of the study group had residual SDB.”
The results will be presented at the ATS 2012 International Conference in San Francisco.
Median age of the children in the study was 15.5 years (range 10.1-18.0). Participants underwent baseline sleep screening and those with diagnosed SDB underwent additional sleep screening four-six months after weight loss treatment. A fasting blood assay was performed at baseline and at four-six months.
Mean BMI at baseline was 36.4 kg/m2. After a six-month weight loss program that incorporated diet, increased physical activity and psychological support, mean BMI was reduced to 29.2 kg/m2. ASAT improved after weight loss in parallel with an improvement in oxygen saturation during sleep, while HDL-cholesterol mainly improved with lowering BMI.
“The association between SDB and metabolic parameters in children remains controversial,” said Dr. Verhulst. “This study confirmed the independent effect of nocturnal hypoxia on HDL-cholesterol and liver enzyme levels in morbidly obese teenagers with SDB at baseline. We also confirmed that weight loss has a high success percentage in the treatment of SDB in obese teenagers. Furthermore, both weight loss and the consequent improvement in SDB both drive improvements in metabolic dysregulation.”
“Because of the high dropout rate after six months and the relatively limited number of subjects with residual sleep apnea, these findings need to be confirmed in a larger study,” Dr. Verhulst concluded. “Furthermore, it remains important to study the mechanisms linking SDB with these metabolic parameters in obese teens and to study the long-term effects of SDB on future metabolic and cardiovascular morbidity.”
“Sleep-Disordered Breathing And Metabolic Dysregulation In Obese Children Before And After Weight Loss” (Session D18, Wednesday, May 23, 9:30 a.m., Room 3020-3022, Moscone Center; Abstract 30317)
* Please note that numbers in this release may differ slightly from those in the abstract. Many of these investigations are ongoing; the release represents the most up-to-date data available at press time.
Introduction: A high prevalence of sleep-disordered breathing (SDB) is found in childhood obesity. SDB is a known risk factor for developing the metabolic syndrome. Weight loss has been suggested to be the treatment of choice in obese children.
Aim: In this study we focused on the effects of weight loss and SDB on common metabolic parameters.
Methods: Consecutive obese children between 10 and 18 years were recruited. They followed a treatment program with diet, increased physical activity and psychological support. All children underwent a baseline sleep screening and a control study after 4-6 months of treatment in case of diagnosed SDB. A fasting blood assay was performed baseline and after 4-6 months.
Results: 84 children and adolescents with a median age of 15.1 years (9.5-18.9) were included. Mean BMI z-score was 2.73 0.41. 44% of the subjects had SDB. Respiratory disturbance index correlated with HDL-cholesterol (r=-0.34; P=0.002), ASAT (r=0.33; P=0.003) and ALAT (r=0.35; P=0.001). No correlations were found for glucose, triglycerides and total cholesterol. After weight loss treatment all metabolic parameters improved and only 8% of the patients had residual SDB. Improvements in ASAT and ALAT were mediated by improvements in BMI. Improvements in oxygen desaturation index (ODI) were associated with an increase in HDL-cholesterol (r=0.49; P=0.003).
Conclusion: This study confirms the link between ASAT, ALAT, HDL-cholesterol and SDB baseline. HDL-cholesterol improved after weight loss in association with improvements in ODI.
Funded by: None reported
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