Effects of dehydration on thermoregulation in cats exposed to high ambient temperatures.
Effects of dehydration on thermoregulation in cats exposed to high ambient temperatures.
复制标题
脱水对暴露在高温环境下的猫的体温调节的影响。
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
M. A. Baker
中科院分区：
文献类型：
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作者：
P. Doris;M. A. Baker
在暴露于几种高环境温度的9只水合猫中测量蒸发性失水（EWL）、代谢率（MR）、体核温度（Tc）和呼吸率（RR）。在自由饮水的动物和进行性脱水期间进行测量。在43和40 ℃时，脱水过程中EWL没有显著变化。在38和35摄氏度，脱水4天的动物的EWL减少到约50%的水合水平。RR的降低与EWL的降低高度相关，这表明脱水猫的蒸发控制在很大程度上取决于RR的控制。在43、40和38摄氏度下，脱水动物的Tc显着升高，在35摄氏度下观察到不明显的上升趋势。多元线性回归分析的数据EWL，Tc，和脱水水平表明，脱水减少蒸发反应升高Tc，并表明温度调节系统的敏感性发生变化。对MR、Tc和脱水水平的类似分析表明，在给定的Tc下，脱水导致较低的MR。在脱水过程中，经体温校正的MR变化主要与代谢能消耗的改变有关。已经形成了一个模型来估计猫的通气代谢成本。
Measurements of evaporative water loss (EWL), metabolic rate (MR), body core temperature (Tc), and respiratory rate (RR) were made in nine hydrated cats exposed to several high ambient temperatures. Measurements were made in animals hydrated ad libitum and during progressive dehydration. At 43 and 40 degrees C, no significant change in EWL occurred during dehydration. At 38 and 35 degrees C, EWL in animals dehydrated for 4 days was reduced to about 50% of hydrated levels. Reductions in RR correlated highly with reduced EWL, suggesting that control of evaporation in dehydrated cats is dependent largely on control of RR. Significant elevations in Tc occurred in dehydrated animals at 43, 40, and 38 degrees C, and an insignificant upward trend was observed at 35 degrees C. Multiple linear regression analysis of data for EWL, Tc, and level of dehydration indicates that dehydration reduces the evaporative response to elevations in Tc and suggests that a change in the sensitivity of the thermoregulatory system is occurring. A similar analysis for MR, Tc, and level of dehydration shows that dehydration results in a lower MR at a given Tc. Changes in MR, corrected for body temperature, during dehydration are principally related at altered ventilatory energy expenditure. A model has been formed for estimating the metabolic cost of ventilation in the cat.