Respiratory water loss and oxygen consumption in full-term infants exposed to cold air on the first day after birth
Autor: | K Hammarlund, T Riesenfeld, Gunnar Sedin, S Kjartansson, Gunnar Sjörs |
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Rok vydání: | 1994 |
Předmět: |
Male
medicine.medical_specialty chemistry.chemical_element Motor Activity Oxygen law.invention chemistry.chemical_compound Oxygen Consumption Animal science law Respiration medicine Humans Relative humidity Respiratory system Skin business.industry Infant Newborn Humidity General Medicine Carbon Dioxide Thermoregulation Water Loss Insensible Surgery Cold Temperature chemistry Regional Blood Flow Pediatrics Perinatology and Child Health Carbon dioxide Ventilation (architecture) Female Skin Temperature business Body Temperature Regulation |
Zdroj: | Acta Paediatrica. 83:802-807 |
ISSN: | 1651-2227 0803-5253 |
Popis: | Respiratory water loss, oxygen consumption, carbon dioxide production and skin blood flow were measured continuously in nine full-term infants on the first day after birth. After at least 18 min of measurements with the infant asleep in an incubator, with an air temperature of 33 degrees C and a relative humidity of 50%, the temperature of the incubator air was lowered to less than 27.5 degrees C. This resulted in a significant decrease in skin temperature and peripheral skin blood flow, while the infant's core temperature remained unchanged. At the same time, mean respiratory water loss increased from 3.7 to 6.1 mg/kg.min, which can be explained partially by the decrease in ambient humidity that accompanied the decrease in air temperature. In addition, mean oxygen consumption increased from 5.3 to 7.9 ml/kg.min and mean carbon dioxide production increased from 3.8 to 5.9 ml/kg.min. There was no concomitant increase in motor activity. Thus, when the newborn infants were exposed to cool air, they reacted with an increase in respiratory water loss, oxygen consumption and carbon dioxide production before their core temperature was affected and without increasing their motor activity. |
Databáze: | OpenAIRE |
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