This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.In this protocol, the combined and independent effects of weight loss and apnea improvement induced by gastric bypass surgery will be evaluated for its effects on autonomic nervous system activity, endothelial function, lipid profile, BP and inflammatory markers in obese individuals in order to test the following hypotheses: 1) The greatest improvement in cardiovascular abnormalities will be seen in those obese subjects with severe obstructive sleep apnea at baseline, as they will have both a reduction in weight and in apnea severity following gastric bypass surgery. 2) The improvement in cardiovascular abnormalities such as sympathetic excitation and systemic inflammation will be correlated with the degree of improvement in sleep apnea, as measured by a reduction in Apnea Hypopnea Index, improvement in oxygenation, and decreased sleep fragmentation.
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