Schedule-induced chronic hypertension.
Rats were fed on an intermittent-feeding schedule one 45-mg food pellet every 90 sec for 5 hours per day (experimental group) or an equivalent food ration as a single, daily feeding (control group). All animals were mononephrectomized and given saline to drink. Experimental animals became polydipsic (schedule-induced polydipsia). The rate and amount of fluid intakes between the two groups were controlled in the second experiment. In both experiments a significant blood pressure difference developed between the groups and remained terminally after water replaced saline as the drinking fluid for about 3 weeks. The development of chronic hypertension in the experimental group in the second experiment is regarded as a psychosomatic counterpart of other excessive and persistent behaviors (e.g., polydipsia, aggression), which can be induced by certain intermittent-feeding schedules. Observations on the heart (increased weight), kidney (minor pathologic changes), and adrenals (no change) were consistent with essential hypertension.
D000818:Animals; D001794:Blood Pressure; D002908:Chronic Disease; D004195:Disease Models, Animal; D004326:Drinking; D005247:Feeding Behavior; D006801:Humans; D006973:Hypertension / Q000209:etiology*; D008297:Male; D011602:Psychophysiologic Disorders; D051381:Rats; D012055:Reinforcement Schedule; D012965:Sodium Chloride / Q000008:administration & dosage
D012965:Sodium Chloride