Free Fatty Acids, Insulin Resistance, and Corrected QT Intervals in Morbid Obesity: Effect of Weight Loss During 6 Months With Differing Dietary Interventions
| Autor: | Nayyar Iqbal, Frederick F. Samaha, Prakash Seshadri, Kathryn L. Chicano, Linda Stern, Denise A. Daily |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Blood Glucose
Male medicine.medical_specialty Diet Reducing Endocrinology Diabetes and Metabolism medicine.medical_treatment Fatty Acids Nonesterified QT interval Diet Carbohydrate-Restricted Electrocardiography Endocrinology Insulin resistance Heart Rate Weight loss Internal medicine Diabetes mellitus Heart rate Dietary Carbohydrates medicine Humans Insulin Diet Fat-Restricted business.industry General Medicine Middle Aged medicine.disease Dietary Fats Obesity Obesity Morbid Patient Compliance Female Insulin Resistance medicine.symptom business Body mass index |
| Zdroj: | Endocrine Practice. 11:234-239 |
| ISSN: | 1530-891X |
| DOI: | 10.4158/ep.11.4.234 |
| Popis: | To assess whether shortening of the corrected QT (QTc) interval is most closely associated with changes in weight, insulin resistance, or free fatty acids (FFAs) (or some combination of these factors).We randomized 75 severely obese subjects without diabetes to either a low-carbohydrate or a conventional low-fat weight-loss diet for 6 months. We measured QTc, insulin sensitivity, body mass index, and FFAs at baseline and at 6 months. Analysis was performed to determine whether improvement in weight, in insulin resistance, or in FFAs has the greatest effect on reducing the QTc interval."Completers" of both the low-carbohydrate diet (N = 25) and the low-fat diet (N = 22) had a decrease in weight, but the weight loss was greater in the low-carbohydrate group. A statistically significant decrease in QTc from baseline was observed only in the low-carbohydrate group. QTc in the low-carbohydrate group correlated with improvement in insulin resistance, but this finding was not significant after correction for the greater weight loss. FFAs or weight loss was not correlated with QTc in either dietary group.Low-carbohydrate dieting is associated with a greater decrease in the QTc interval in comparison with low-fat dieting. Improvements in insulin resistance seem to have a relatively weak mechanistic role, and a decrease in FFAs has no apparent role in the reduction of the QTc interval. |
| Databáze: | OpenAIRE |
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