Feder M E
J Exp Biol. 1986 Mar;121:271-83. doi: 10.1242/jeb.121.1.271.
To determine the effects of thermal acclimation upon locomotor performance and the rate of oxygen consumption (MO2) during activity, small (less than 3 g), lungless salamanders, Desmognathus ochrophaeus Cope, were acclimated to three temperatures (5, 13 and 21 degrees C) and exercised at various controlled speeds within an exercise wheel while their MO2 was measured. MO2 increased with speed at low speeds (less than 14 cm min-1). Although animals could sustain greater speeds, MO2 did not increase further. These small, exclusively skin-breathing salamanders could increase their MO2 9-11 times during exercise and could sustain nearly half of the oxygen flux expected across a similar surface area of the mammalian lung. However, their maximum aerobic speed was remarkably slow (14 cm min-1) and their net cost of transport remarkably large (15-17 ml O2 g-1 km-1). Thermal acclimation affected MO2 during activity, the maximum sustainable speed and locomotor stamina in different ways. During exercise at 13 degrees C, cold-acclimated animals had a significantly greater MO2 than warm-acclimated animals, but did not differ in stamina or the maximum sustainable speed. During exercise at 21 degrees C, cold acclimation did not affect the MO2 significantly, but it decreased the stamina and increased the rate of lactate accumulation. Thus, these results suggest that thermal acclimation of the MO2 is not tightly coupled to thermal acclimation of locomotor performance in salamanders.
为了确定热适应对无肺蝾螈（Desmognathus ochrophaeus Cope，体重小于3克）活动时运动表现和耗氧率（MO2）的影响，将其置于三种温度（5、13和21摄氏度）下进行热适应，然后在运动轮中以不同的控制速度运动，同时测量它们的MO2。在低速（小于14厘米/分钟）时，MO2随速度增加。尽管动物能够维持更高的速度，但MO2并未进一步增加。这些小型的、完全通过皮肤呼吸的蝾螈在运动时可以将其MO2提高9至11倍，并且能够维持的氧通量接近哺乳动物肺相同表面积预期氧通量的近一半。然而，它们的最大有氧速度非常慢（14厘米/分钟），其单位运输净成本非常高（15 - 17毫升O2/克·千米）。热适应以不同方式影响活动期间的MO2、最大可持续速度和运动耐力。在13摄氏度运动时，冷适应动物的MO2显著高于热适应动物，但在耐力或最大可持续速度方面没有差异。在21摄氏度运动时，冷适应对MO2没有显著影响，但会降低耐力并增加乳酸积累速率。因此，这些结果表明，蝾螈MO2的热适应与运动表现的热适应并没有紧密联系。
