Effect of illumination on water intake, thirst, and urine output in the rat

Gutman, Yehuda; Benzakein, Felix; Chaimovitz, M.

doi:10.1152/ajplegacy.1969.217.2.471

Cited by 16 publications

(3 citation statements)

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“…These results are consistent with the observation that rats consume more water at night even without prior water deprivation 3,4,9 . The diurnal variation in drinking is believed to be influenced by the rat 24 h rhythm of activity, 11 the feeding rhythm, 6,8 the ‘habitual need’ for water at night 4 or the external lighting conditions 4,12 . Although Oatley reported that the water intake in the first hour after 24 h water deprivation was not influenced by the time of day, 5 our study clearly shows that there was a significant effect of the time of day on water consumed at all times during the 6 h post‐deprivation.…”

Section: Discussionsupporting

confidence: 90%

Time Of Day And Access To Food Alter Water Intake In Rats After Water Deprivation

Ang

McKitrick

Phillips

et al. 2001

Clin Exp Pharma Physio

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1. Drinking behaviour after water deprivation is one of the standard tests used to study thirst in humans and animals. Diurnal cycle and food availability are known to influence water intake, but have not been considered in previous studies of thirst after water deprivation. In the present study, we examined the effects of diurnal variation and food availability on water intake after 24 h water deprivation in rats. 2. All rats cycled through four treatments in varying order. These treatments were: (i) 24 h water deprivation with free access to food from 1900 h one day to 1900 h the next day, followed by free access to both food and water (Night-with-Food); (ii) 24 h water deprivation with free access to food from from 1900 h one day to 1900 h the next day, followed by free access to water but not food (Night-without-Food); (iii) 24 h water deprivation with free access to food from 0700 h one day to 0700 h the next day, followed by free access to both food and water (Day-with-Food); or (iv) 24 h water deprivation with free access to food from 0700 h one day to 0700 h the next day, followed by free access to water but not food (Day-without-Food). The amount of water consumed during the first 6 h, post-24 h water deprivation, was examined under each condition. 3. There was a significant diurnal effect (P < 0.001) and a significant food availability effect (P = 0.007) on the water consumed in the 6 h period after water deprivation. Most water was consumed by the Night-with-Food group and the least amount of water was consumed by the Day-without-Food group. These effects persisted after correction for water intake during 6 h periods from 0700 and 1900 h with and without food but without previous water deprivation. The diurnal and food availability effects on water consumption were independent (P = 0.5). 4. The coefficient of variability for each group suggests that the most sensitive measurements of water intake are obtained during the day in the absence of food. 5. We conclude that both the time of day and access to food independently alter water intake in rats subjected to a previous 24 h water deprivation. Our study also supports the validity of performing water intake measurements in thirst studies in rats during the day.

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Section: Discussionsupporting

confidence: 90%

Time Of Day And Access To Food Alter Water Intake In Rats After Water Deprivation

Ang

McKitrick

Phillips

et al. 2001

Clin Exp Pharma Physio

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show abstract

“…The photoperiod is also an important control of ingestion. The spontaneous drinking (and feeding) behavior of virtually all animals is obedient to the light/dark cycle (Richter, 1965), with good evidence of an endogenous or circadian periodicity (Gutman, Benzakein, & Chaimovitz, 1969) that, in the rat, appears to be acquired during weaning (Levin & Stern, 1975). Again, neurological investigation has only begun.…”

Section: Drinking Without Deficitsmentioning

confidence: 99%

The Physiological Mechanisms of Motivation

Pfaff¹

1982

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“…intake in food-deprived rats, Gutman et at. [5] noticed that the light-induced inhibition of spontaneous drinking disappeared after the 3rd day.…”

Section: N Umber O F Animalsmentioning

confidence: 99%

Effects of Blue and White Light on Infant (Gunn) Rats and on Lactating Mother Rats

Ballowitz¹

1971

Neonatology

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Effect of illumination on water intake, thirst, and urine output in the rat

Cited by 16 publications

References 0 publications

Time Of Day And Access To Food Alter Water Intake In Rats After Water Deprivation

Time Of Day And Access To Food Alter Water Intake In Rats After Water Deprivation

The Physiological Mechanisms of Motivation

Effects of Blue and White Light on Infant (Gunn) Rats and on Lactating Mother Rats

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