Doris P A, Baker M A
J Appl Physiol Respir Environ Exerc Physiol. 1981 Jul;51(1):46-54. doi: 10.1152/jappl.1981.51.1.46.
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.
对9只处于水合状态的猫在几个较高环境温度下进行了蒸发水损失（EWL）、代谢率（MR）、体核温度（Tc）和呼吸频率（RR）的测量。测量在自由饮水的动物以及进行性脱水过程中进行。在43摄氏度和40摄氏度时，脱水过程中EWL没有显著变化。在38摄氏度和35摄氏度时，脱水4天的动物的EWL降至水合状态水平的约50%。RR的降低与EWL的降低高度相关，这表明脱水猫的蒸发控制很大程度上依赖于RR的控制。在43摄氏度、40摄氏度和38摄氏度时，脱水动物的Tc显著升高，在35摄氏度时观察到不显著的上升趋势。对EWL、Tc和脱水程度数据的多元线性回归分析表明，脱水会降低对Tc升高的蒸发反应，并表明体温调节系统的敏感性正在发生变化。对MR、Tc和脱水程度的类似分析表明，脱水会导致在给定Tc时MR降低。脱水过程中经体温校正的MR变化主要与通气能量消耗的改变有关。已经建立了一个模型来估计猫的通气代谢成本。
