Stewart K T, Rosenwasser A M, Adler N T
Physiol Behav. 1985 Apr;34(4):601-8. doi: 10.1016/0031-9384(85)90055-1.
The purpose of this experiment was to investigate the relationship between daily patterns of wheel running activity and feeding behavior. Wheel running and bar pressing for food were continuously recorded from rats which had concurrent access to both wheels and food. In a second condition, wheel running and (non-reinforced) bar pressing were recorded during food deprivation. In a third condition, bar pressing for food was recorded while wheel running was prevented. During ad lib access to wheels and food, both behaviors occurred primarily during the dark phase of the light-dark cycle. However, the nocturnal distribution of these responses differed: the early dark hours were primarily devoted to running, while feeding occurred in small, frequent meals. Maximal food intake occurred during the late dark hours, when meals were larger and less frequent, and there was little running. During three days of complete food deprivation, both wheel running and meal initiation attempts (as indicated by nonreinforced bar pressing) maintained their normal daily patterns. However, during wheel deprivation, changes occurred in the temporal distribution of meals which equalized early and late dark food intake. These results show that the availability of an alternative activity, like wheel running, can be an important determinant of daily feeding patterns. However, the daily pattern of wheel running is not influenced by food availability. Different behaviors may show differential plasticity in the coordination of an overall daily behavioral program.
本实验的目的是研究日常跑步活动模式与进食行为之间的关系。从同时可以使用轮子和食物的大鼠身上持续记录轮子跑步和按压食物杆的行为。在第二种情况下，在食物剥夺期间记录轮子跑步和（无强化的）按压食物杆行为。在第三种情况下，在阻止轮子跑步时记录按压食物杆行为。在自由使用轮子和食物期间，两种行为主要发生在明暗循环的黑暗阶段。然而，这些反应的夜间分布有所不同：黑暗早期主要用于跑步，而进食则以少量、频繁的餐食形式出现。最大食物摄入量发生在黑暗后期，此时餐食量大且频率较低，跑步活动很少。在完全食物剥夺的三天里，轮子跑步和进食开始尝试（如无强化按压食物杆所示）都保持其正常的日常模式。然而，在剥夺轮子使用期间，进食的时间分布发生了变化，使黑暗早期和后期的食物摄入量趋于均衡。这些结果表明，像轮子跑步这样的替代活动的可用性可能是日常进食模式的一个重要决定因素。然而，轮子跑步的日常模式不受食物可用性的影响。不同行为在整体日常行为程序的协调中可能表现出不同的可塑性。
