title: Long scotophase acclimation increases free urinary catecholamine content in the rat.
abstract: 1. Acclimation of laboratory rats Rattus norvegicus albino to long scotophase 8L:16D and 4L:20D at an ambient temperature (Ta) of 25 degrees C caused an increase in urinary free catecholamine compared to 12L:12D at Ta = 25 degrees C. 2. Transferring the same individuals from 8L:16D to 12L:12D (at Ta = 25 degrees C) caused a decrease in this factor. 3. The results of this study suggest that acclimation to long scotophase increases sympathetic nervous system and chromaffine cell activities.
mesh_terms: D000818:Animals; D001835:Body Weight; D002395:Catecholamines / Q000652:urine*; D003624:Darkness; D008297:Male; D051381:Rats; D013997:Time Factors
chemical_list: D002395:Catecholamines