Publications (4)0.33 Total impact
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Article: [Energy expenditure and body composition in severe and morbid obese women after gastric bypass].
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ABSTRACT: The effects of gastric bypass (GBP) on resting energy expenditure (REE) are not well known. To evaluate the changes in REE and its relationship with body composition in severe and morbid obese women before and six and twelve months after GBP. Twenty three women aged 37+/-10 years, with a body mass index of 44+/-4 kg/m(2), were evaluated before, six and twelve months after GBP. REE was measured in a Deltatrac indirect calorimeter and expressed as kcal/day Fat mass (EM), and fat free mass (EEM) were determined by double beam X-ray densitometry (DEXA). Body weight reduction six and twelve months after GBP was 29.0+/-4.3 and 35.8+/-6.9%, respectively. The best predictor of weight reduction was initial weight (p <0.01). At six and twelve months, REE decreased by 291.7+/-260.0 and 353.8+/-378.4 kcal/day, respectively. In the same periods REE/kg body weight increased by 3.3 and 4.8 kcal/kg respectively, compared to baseline. REE/kg EEM was unchanged. GBP was associated with significant changes in body composition after six and twelve months. However, despite weight reduction, resting energy expenditure per fat free mass unit did not change significantly.Revista medica de Chile 05/2008; 136(5):570-7. · 0.33 Impact Factor -
Article: Zinc absorption from a micronutrient-fortified dried cow's milk used in the Chilean National Complementary Food Program
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ABSTRACT: The objective was to compare the absorption of zinc from a micronutrient-fortified dried cow's milk, which is part of the Chilean National Complementary Food Program, with that from a standard nonfortified milk. Fortification included the addition of iron, zinc, copper, and ascorbic acid to provide total concentrations (in 100 g of powder) of 10, 5, 0.5, and 70 mg, respectively. Seven adults with normal plasma zinc concentrations (16.0 +/- 0.9 mu mol/L) were studied. Fractional absorption of zinc was determined from single test meals using a stable isotope-based methodology. Mean (+/- SD) fractional absorption of zinc of the test meal containing nonfortified milk was 0.29 +/- 0.09 compared with 0.30 +/- 0.09 of the test meal with the fortified milk (P = not significant). Absolute zinc absorptions from the test meals were 0.43 +/- 0.14 vs 0.57 +/- 0.16 mg, respectively (P =.02). Micronutrient fortification of dried cow's milk, including zinc, was associated with increased total zinc absorption. -
Article: Gasto energético y composición corporal en mujeres con obesidad severa y mórbida sometidas a bypass gástrico
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ABSTRACT: The effects of gastric bypass (GBP) on resting energy expenditure (REE) are not well known. Aim: To evaluate the changes in REE and its relationship with body composition in severe and morbid obese women before and six and twelve months after GBP. Patients and methods: Twenty three women aged 37±10 years, with a body mass index of 44±4 kg/m2, were evaluated before, six and twelve months after GBP. REE was measured in a Deltatrac indirect calorimeter and expressed as kcal/day. Fat mass (FM), and fat free mass (FFM) were determined by double beam X ray densitometry (DEXA). Results: Body weight reduction six and twelve months after GBP was 29.0±4.3 and 35.8±6.9%, respectively. The best predictor of weight reduction was initial weight (p <0.01). At six and twelve months, REE decreased by 291.7±260.0 and 353.8±378.4 kcal/day, respectively. In the same periods REE/kg body weight increased by 3.3 and 4.8 kcal/kg respectively, compared to baseline. REE/kg FFM was unchanged. Conclusions: GBP was associated with significant changes in body composition after six and twelve months. However, despite weight reduction, resting energy expenditure per fat free mass unit did not change significantly -
Article: Concordancia entre gasto energético y reposo medido y estimado por fórmulas predictivas en mujeres con obesidad severa y mórbida
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ABSTRACT: Publicación ISI Email : projasmon@gmail.com Objective: To compare measured resting energy expenditure (REE) with that predicted by formulas derived from populations with normal weight or obesity and from women with severe and morbid obesity. Material and methods: 66 women (aged 35.6 +/- 10.3 y and BMI of 44.7 +/- 4.9 kg/m(2)) were evaluated by indirect calorimetry with a metabolic monitor Deltatrac (Datex Inst., Finland), before undergoing gastric bypass. REE was calculated with the following equations: Harris-Benedict's with both actual and adjusted weight, Ireton-Jones', Mifflin's, and Carrasco's Fast Estimation, which corresponds to 16.2 kcal x kg actual weight. Results: (mean +/- sd). Measured REE was 1797 +/- 239 kcal/day. All formulas, except Harris-Benedict's with adjusted weight, overestimated REE. The Ireton-Jones' equation presented the greater overestimation (689 329 kcal/day), whereas Mifflin's equation overestimated REE only by 6 202 kcal/day. No significant differences were detected between measured and calculated REE by Mifflin's and Carrasco's Fast Estimation. Accuracy (defined as difference between calculated and measured REE within +/- 10%) was greater with Mifflin's equation (68%), followed by Harris-Benedict's with actual weight (64%) and Carrasco's Fast Estimation (61%). By using the Bland-Altman analysis, significant correlations were observed between calculated-measured REE and mean REE (calculated + measured/2) with all equations except Carrasco's Fast Estimation. This means that all but one formula underestimate or overestimate REE depending on the level of measured REE. Conclusion: In severe and morbid obese women, Mifflin's and Carrasco's Fast Estimation equations provided the best performance to estimate REE. Before recommending an equation in an a subset of individuals it is necessary to make previous validation studies mine that equation with the best predictive power for this particular group of patients.
