Thermoregulatory ability of female rats during pregnancy and lactation
| Autor: | M. A. Toraason, E. A. Knecht, G. L. Wright |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
medicine.medical_specialty
Pregnancy Hot Temperature Physiology Late gestation Thermoregulation Biology medicine.disease Adaptation Physiological Rats Endocrinology medicine.anatomical_structure Heat acclimation Body Water Physiology (medical) Internal medicine Lactation medicine Gestation Animals Pregnancy Animal Female Body Temperature Regulation |
| Zdroj: | The American journal of physiology. 239(5) |
| ISSN: | 0002-9513 |
| Popis: | Thermoregulatory ability of female rats was examined before pregnancy, during gestation, and during lactation. Thermoregulatory pattern, colonic temperature, evaporative water loss, and survival time were monitored during terminal heating (39.5 +/- 0.9 degrees C) designed to allow prolonged survival (3-4 h) with a sustained thermoregulatory effort. Results confirmed our previously reported observation of decreased thermoregulatory ability in lactating dams, with evidence suggesting thermoregulatory impairment during late gestation. Lactating dams displayed a type III thermoregulatory pattern, and established a rate of evaporative water loss effective for thermostasis at an elevated colonic temperature. However, survival time was significantly decreased compared to nonreproducing females. In contrast, prior heat acclimation tended to increase the survival time of lactating dams. It was concluded that the reduction in thermoregulatory ability observed in lactating dams was related to their inability to maintain a rate of evaporative water loss effective for thermostasis at an elevated colonic temperature. |
| Databáze: | OpenAIRE |
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