کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2807179 1157151 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Persistent suppression of resting energy expenditure after acute hypoxia
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
پیش نمایش صفحه اول مقاله
Persistent suppression of resting energy expenditure after acute hypoxia
چکیده انگلیسی

Resting energy expenditure (REE) is known to be influenced by various ambient conditions such as oxygen supply. Investigations in healthy subjects during acute hypoxia revealed a drop in REE, but persistent effects after hypoxia had ended have not been examined so far. Although indirect calorimetry is a well-established method to measure REE, it may lead to false conclusions when hyperventilation, rise in lactate or catecholamines, and decrease of food intake accompany hypoxia. Therefore, we determined REE in healthy men after hypoxia had ended and under conditions of controlled energy supply during a glucose clamp. In a double-blind crossover study design, we induced hypoxia for 30 minutes by decreasing oxygen saturation to 75% (vs 96% in a control session) in 13 healthy men. Indirect calorimetry was performed at baseline and 150 minutes after hypoxia had ended. Plasma glucose was held stable between 4.5 and 5.5 mmol/L, and lactate as well as catecholamine concentrations were monitored. In parallel, we measured alterations in hormones of the hypothalamic-pituitary-thyroid axis, which is one known factor mediating changes in REE. Resting energy expenditure was decreased after hypoxia (from 1656 ± 80 to 1564 ± 97 kcal/d) as compared with the normoxic control condition (1700 ± 82 to 1749 ± 79 kcal/d, P = .037), whereas the respiratory quotient remained stable (P = .79). Plasma lactate, catecholamine levels, and the pituitary thyroid secretory activity were unchanged after hypoxia (P > .2). Our data demonstrate that the REE decrease persists 150 minutes after acute hypoxia, indicating an adaptation of energy metabolism. This should be valued as an additive pathogenic factor in diseases with disturbed energy metabolism.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Metabolism - Volume 55, Issue 5, May 2006, Pages 669–675
نویسندگان
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