Pineal and retinal melatonin is involved in the control of circadian locomotor activity and body temperature rhythms in the pigeon

1989 ◽  
Vol 166 (2) ◽  
Author(s):  
Itsuki Oshima ◽  
Hideki Yamada ◽  
Maki Goto ◽  
Koji Sato ◽  
Shizufumi Ebihara
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Temperature Rhythms

scholarly journals Circadian Disruption Alters the Effects of Lipopolysaccharide Treatment on Circadian and Ultradian Locomotor Activity and Body Temperature Rhythms of Female Siberian Hamsters

2015 ◽  
Vol 30 (6) ◽  
pp. 543-556 ◽  
Author(s):  
Brian J. Prendergast ◽  
Erin J. Cable ◽  
Tyler J. Stevenson ◽  
Kenneth G. Onishi ◽  
Irving Zucker ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Disruption ◽  
Siberian Hamsters ◽  
Temperature Rhythms

Circadian locomotor activity and core-body temperature rhythms in Alzheimer's disease

1995 ◽  
Vol 16 (5) ◽  
pp. 765-771 ◽  
Author(s):  
Andrew Satlin ◽  
Ladislav Volicer ◽  
Edward G. Stopa ◽  
David Harper
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Locomotor Activity ◽  
Body Temperature ◽  
Core Body Temperature ◽  
Temperature Rhythms ◽  
Core Body

Flexibility in body temperature rhythms of free-living natal mole-rats (Cryptomys hottentotus natalensis)

2021 ◽  
pp. 102973
Author(s):  
M.K. Oosthuizen ◽  
G. Robb ◽  
A. Harrison ◽  
A. Froneman ◽  
K. Joubert ◽  
...  
Keyword(s):  
Body Temperature ◽  
Free Living ◽  
Temperature Rhythms

Light-induced suppression of the rat circadian system

1995 ◽  
Vol 268 (5) ◽  
pp. R1111-R1116 ◽  
Author(s):  
P. Depres-Brummer ◽  
F. Levi ◽  
G. Metzger ◽  
Y. Touitou
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Prolonged Exposure ◽  
Light Exposure ◽  
Continuous Light ◽  
Circadian System ◽  
Short Exposure ◽  
Complete Suppression ◽  
Continuous Darkness

In a constant environment, circadian rhythms persist with slightly altered period lengths. Results of studies with continuous light exposure are less clear, because of short exposure durations and single-variable monitoring. This study sought to characterize properties of the oscillator(s) controlling the rat's circadian system by monitoring both body temperature and locomotor activity. We observed that prolonged exposure of male Sprague-Dawley rats to continuous light (LL) systematically induced complete suppression of body temperature and locomotor activity circadian rhythms and their replacement by ultradian rhythms. This was preceded by a transient loss of coupling between both functions. Continuous darkness (DD) restored circadian synchronization of temperature and activity circadian rhythms within 1 wk. The absence of circadian rhythms in LL coincided with a mean sixfold decrease in plasma melatonin and a marked dampening but no abolition of its circadian rhythmicity. Restoration of temperature and activity circadian rhythms in DD was associated with normalization of melatonin rhythm. These results demonstrated a transient internal desynchronization of two simultaneously monitored functions in the rat and suggested the existence of two or more circadian oscillators. Such a hypothesis was further strengthened by the observation of a circadian rhythm in melatonin, despite complete suppression of body temperature and locomotor activity rhythms. This rat model should be useful for investigating the physiology of the circadian timing system as well as to identify agents and schedules having specific pharmacological actions on this system.

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