Biomaterial Database

Circadian drinking rhythms in SHR and WKY rats: effects of increasing light intensity. 1993

A M Rosenwasser

Department of Psychology, University of Maine, Orono 04469-5742.

This study sought to define the generality of a previous finding that the spontaneously hypertensive (SHR) and normotensive Wistar-Kyoto (WKY) rat strains differ in free-running circadian period when maintained in running-wheel cages under constant light. Circadian drinking rhythms were monitored in SHRs and WKYs housed without access to running wheels under an increasing series of light intensities beginning with constant darkness. Strain differences in circadian period were seen only at relatively high light intensities, indicating that SHRs and WKYs differ in circadian light sensitivity. Since SHRs and WKYs differ in circadian period with or without access to running wheels, this strain difference is not likely to depend on differential locomotor activity levels. SHRs and WKYs also differed in spectral profile and circadian waveform, but only under low light intensities. At higher intensities, dissociation of rhythmicity was seen in both strains.

UI	MeSH Term	Description	Entries
D008027	Light	That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.	Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
D008297	Male		Males
D009043	Motor Activity	Body movements of a human or an animal as a behavioral phenomenon.	Activities, Motor,Activity, Motor,Motor Activities
D011918	Rats, Inbred SHR	A strain of Rattus norvegicus with elevated blood pressure used as a model for studying hypertension and stroke.	Rats, Spontaneously Hypertensive,Rats, SHR,Inbred SHR Rat,Inbred SHR Rats,Rat, Inbred SHR,Rat, SHR,Rat, Spontaneously Hypertensive,SHR Rat,SHR Rat, Inbred,SHR Rats,SHR Rats, Inbred,Spontaneously Hypertensive Rat,Spontaneously Hypertensive Rats
D011921	Rats, Inbred WKY	A strain of Rattus norvegicus used as a normotensive control for the spontaneous hypertensive rats (SHR).	Rats, Wistar Kyoto,Wistar Kyoto Rat,Rats, WKY,Inbred WKY Rat,Inbred WKY Rats,Kyoto Rat, Wistar,Rat, Inbred WKY,Rat, WKY,Rat, Wistar Kyoto,WKY Rat,WKY Rat, Inbred,WKY Rats,WKY Rats, Inbred,Wistar Kyoto Rats
D001794	Blood Pressure	PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.	Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D002940	Circadian Rhythm	The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.	Diurnal Rhythm,Nyctohemeral Rhythm,Twenty-Four Hour Rhythm,Nycthemeral Rhythm,Circadian Rhythms,Diurnal Rhythms,Nycthemeral Rhythms,Nyctohemeral Rhythms,Rhythm, Circadian,Rhythm, Diurnal,Rhythm, Nycthemeral,Rhythm, Nyctohemeral,Rhythm, Twenty-Four Hour,Rhythms, Circadian,Rhythms, Diurnal,Rhythms, Nycthemeral,Rhythms, Nyctohemeral,Rhythms, Twenty-Four Hour,Twenty Four Hour Rhythm,Twenty-Four Hour Rhythms
D004326	Drinking	The consumption of liquids.	Water Consumption,Water Intake,Drinkings
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012931	Social Environment	The aggregate of social and cultural institutions, forms, patterns, and processes that influence the life of an individual or community.	Social Context,Environment, Social,Social Ecology,Context, Social,Contexts, Social,Ecologies, Social,Ecology, Social,Environments, Social,Social Contexts,Social Ecologies,Social Environments