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Excess weight is established as a major risk factor for cardiovascular diseases, particularly in young individuals. To get a better understanding of the pathophysiology underlying increased cardiovascular disease risk, we evaluated early signs of organ damage and their possible relationship to sympathetic nervous activity. Eighteen lean (body mass index <25(More)
Changes in measures of heart rate variability (HRV) have been associated with an increased risk for sudden cardiac death. The mechanisms underlying this association are not known. The objective of this study was to assess the relationship between the amount of norepinephrine (NE) released from the cardiac sympathetic terminals and short-term HRV. The study(More)
BACKGROUND Glucose ingestion stimulates sympathetic nervous system (SNS) activity in lean subjects, whereas blunted responses have been reported in the obese. OBJECTIVE The objective was to investigate the impact of insulin resistance on the SNS response to oral glucose. DESIGN Nineteen insulin-resistant (IR) and 12 insulin-sensitive (IS) obese subjects(More)
Suggestions were made that increased myocardial sympathetic activity is reflected by elevated QT variability (dynamic changes in QT interval duration). However, the relationship between QT variability and the amount of norepinephrine released from the cardiac sympathetic terminals is unknown. We thus attempted to assess this relationship. The study was(More)
OBJECTIVE The purpose of this study was to examine the effects of weight loss on sympathetic nervous system responsiveness to glucose ingestion in obese subjects with metabolic syndrome, in whom such responses are reportedly blunted. RESEARCH DESIGN AND METHODS Thirty four subjects, 19 insulin resistant and 15 insulin sensitive and aged 55 +/- 1 years(More)
OBJECTIVE Sympathetic nervous system (SNS) overactivity contributes to the pathogenesis and target organ complications of obesity. This study was conducted to examine the effects of lifestyle interventions (weight loss alone or together with exercise) on SNS function. RESEARCH DESIGN AND METHODS Untreated men and women (mean age 55 +/- 1 year; BMI 32.3(More)
Methods for the determination of serum urate which employ the uricase-peroxidase reaction may suffer interference from concentrations of bilirubin which can be found in relatively mild jaundice. Such concentrations of bilirubin are also frequently present in sera distributed as part of an external quality assessment scheme and, for this reason, laboratories(More)
Excess weight is established as a major risk factor for cardiovascular diseases, particularly in young individuals. To get a better understanding of the pathophysiology underlying increased cardiovascular disease risk, we evaluated early signs of organ damage and their possible relationship to sympathetic nervous activity. Eighteen lean (body mass index 25(More)
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