Is energy substrate mobilization a limiting factor for cold thermogenesis?
| Autor: | Ira Jacobs, Peter Tikuisis, Michel B. Ducharme, André L. Vallerand |
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| Rok vydání: | 1993 |
| Předmět: |
Limiting factor
Adult Male Physiology Calorimetry Carbohydrate metabolism Body Temperature Animal science Physiology (medical) medicine Ingestion Humans Orthopedics and Sports Medicine Analysis of Variance Chemistry Public Health Environmental and Occupational Health Rectum Substrate (chemistry) General Medicine Hypothermia Thermoregulation Cold Temperature Biochemistry Carbohydrate Metabolism medicine.symptom Energy Metabolism Skin Temperature Thermogenesis Oxidation-Reduction Body Temperature Regulation |
| Zdroj: | European journal of applied physiology and occupational physiology. 67(3) |
| ISSN: | 0301-5548 |
| Popis: | Energy substrate mobilization has been suggested as being a limiting factor for the rate of cold-induced thermogenesis (M), and consequently in delaying hypothermia. The evidence supporting this hypothesis in humans, however, is not convincing and the hypothesis has yet to be tested in a rigorous manner using a full heat balance analysis (partitional calorimetry). The goal of this study was therefore to re-investigate whether enhancing energy substrate mobilization by feeding cold-exposed subjects would improveM and affect heat debt (S; the minute-by-minute balance ofM and heat losses) as well as rectal (T re) and mean skin temperatures $$\bar T_{sk} $$ . Nine healthy semi-nude fasted subjects were exposed to 5° C (3 h at rest, 1 m · s−1 wind) on three occasions following the ingestion at min 0 and 90 of either: (1) a placebo, (2) 710 kJ of pure carbohydrates (100%-CHO), or (3) 710 kJ of a high-carbohydrate bar (High-CHO). As expected in the cold,T re andT sk decreased whereasM, S and heat losses increased (P |
| Databáze: | OpenAIRE |
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