scholarly journals Effects of Resveratrol on Daily Rhythms of Locomotor Activity and Body Temperature in Young and Aged Grey Mouse Lemurs

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Fabien Pifferi ◽  
Alexandre Dal-Pan ◽  
Solène Languille ◽  
Fabienne Aujard
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Biological Clock ◽  
The Elderly ◽  
Aged Mouse ◽  
Dark Cycle ◽  
Temperature Rhythm ◽  
Mouse Lemurs ◽  
Body Temperature Rhythm ◽  
Activity Onset

In several species, resveratrol, a polyphenolic compound, activates sirtuin proteins implicated in the regulation of energy balance and biological clock processes. To demonstrate the effect of resveratrol on clock function in an aged primate, young and aged mouse lemurs(Microcebus murinus)were studied over a 4-week dietary supplementation with resveratrol. Spontaneous locomotor activity and daily variations in body temperature were continuously recorded. Reduction in locomotor activity onset and changes in body temperature rhythm in resveratrol-supplemented aged animals suggest an improved synchronisation on the light-dark cycle. Resveratrol could be a good candidate to restore the circadian rhythms in the elderly.

scholarly journals Drosophila Temperature Preference Rhythms: An Innovative Model to Understand Body Temperature Rhythms

2019 ◽  
Vol 20 (8) ◽  
pp. 1988 ◽  
Author(s):  
Tadahiro Goda ◽  
Fumika N. Hamada
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
The Body ◽  
Metabolic Energy ◽  
Temperature Preference ◽  
Preferred Temperature ◽  
Activity Rhythms ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Human Body Temperature

Human body temperature increases during wakefulness and decreases during sleep. The body temperature rhythm (BTR) is a robust output of the circadian clock and is fundamental for maintaining homeostasis, such as generating metabolic energy and sleep, as well as entraining peripheral clocks in mammals. However, the mechanisms that regulate BTR are largely unknown. Drosophila are ectotherms, and their body temperatures are close to ambient temperature; therefore, flies select a preferred environmental temperature to set their body temperature. We identified a novel circadian output, the temperature preference rhythm (TPR), in which the preferred temperature in flies increases during the day and decreases at night. TPR, thereby, produces a daily BTR. We found that fly TPR shares many features with mammalian BTR. We demonstrated that diuretic hormone 31 receptor (DH31R) mediates Drosophila TPR and that the closest mouse homolog of DH31R, calcitonin receptor (Calcr), is essential for mice BTR. Importantly, both TPR and BTR are regulated in a distinct manner from locomotor activity rhythms, and neither DH31R nor Calcr regulates locomotor activity rhythms. Our findings suggest that DH31R/Calcr is an ancient and specific mediator of BTR. Thus, understanding fly TPR will provide fundamental insights into the molecular and neural mechanisms that control BTR in mammals.

The Circadian Body Temperature Rhythm in the Elderly: Effect of Single Daily Melatonin Dosing

2006 ◽  
Vol 23 (3) ◽  
pp. 639-658 ◽  
Author(s):  
D. G. Gubin ◽  
G. D. Gubin ◽  
J. Waterhouse ◽  
D. Weinert
Keyword(s):  
Body Temperature ◽  
The Elderly ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm

scholarly journals Entrainment of circadian rhythms of locomotor activity by ambient temperature cycles in the dromedary camel

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hicham Farsi ◽  
Mohamed R. Achaâban ◽  
Mohammed Piro ◽  
Béatrice Bothorel ◽  
Mohammed Ouassat ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Ambient Temperature ◽  
Cycle Phase ◽  
Dromedary Camel ◽  
Dark Cycle ◽  
Free Running ◽  
Activity Onset ◽  
Master Clock

Abstract In the dromedary camel, a well-adapted desert mammal, daily ambient temperature (Ta)-cycles have been shown to synchronize the central circadian clock. Such entrainment has been demonstrated by examining two circadian outputs, body temperature and melatonin rhythms. Locomotor activity (LA), another circadian output not yet investigated in the camel, may provide further information on such specific entrainment. To verify if daily LA is an endogenous rhythm and whether the desert Ta-cycle can entrain it, six dromedaries were first kept under total darkness and constant-Ta. Results showed that the LA rhythm free runs with a period of 24.8–24.9 h. After having verified that the light–dark cycle synchronizes LA, camels were subjected to a Ta-cycle with warmer temperatures during subjective days and cooler temperatures during subjective nights. Results showed that the free-running LA rhythm was entrained by the Ta-cycle with a period of exactly 24.0 h, while a 12 h Ta-cycle phase advance induced an inversion of the LA rhythm and advanced the acrophase by 9 h. Similarly, activity onset and offset were significantly advanced. All together, these results demonstrate that the Ta-cycle is a strong zeitgeber, able to entrain the camel LA rhythm, hence corroborating previous results concerning the Ta non-photic synchronization of the circadian master clock.

Forced internal desynchronization between circadian temperature and activity rhythms in squirrel monkeys

1985 ◽  
Vol 248 (5) ◽  
pp. R567-R572
Author(s):  
P. H. Gander ◽  
R. Lydic ◽  
H. E. Albers ◽  
M. C. Moore-Ede
Keyword(s):  
Body Temperature ◽  
Squirrel Monkey ◽  
Activity Rhythm ◽  
The Body ◽  
Saimiri Sciureus ◽  
Dark Cycle ◽  
Temperature Rhythm ◽  
Internal Desynchronization ◽  
Body Temperature Rhythm ◽  
Rest Activity

In an attempt to force internal desynchronization between the rest-activity rhythm and the body temperature rhythm of the squirrel monkey (Saimiri sciureus), five animals were studied in a 14:14 light-dark cycle. In four animals a 28-h spectral component was found to predominate in the rest-activity rhythm, whereas an unentrained circadian component (tau = 25.9 +/- 0.4 h) predominated in the body temperature rhythm. Plots of the cycle-by-cycle acrophases of the two rhythms confirm that they desynchronize, due to the failure of the temperature rhythm to entrain to the light-dark cycle. These data from intact animals provide further support for the hypothesis that the squirrel monkey circadian timing system has at least two pacemakers. A rhythm for which the supra-chiasmatic nuclei (SCN) have previously been shown to be essential (rest-activity) simultaneously exhibited a different period from a rhythm (body temperature) that has been shown to persist after destruction of the SCN.

The glycemic index of a mid morning snack modifies the body temperature rhythm

2013 ◽  
Vol 14 ◽  
pp. e242-e243
Author(s):  
J. Belzunce ◽  
C. Noguera ◽  
L. Gené ◽  
R. Rial
Keyword(s):  
Body Temperature ◽  
Glycemic Index ◽  
The Body ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm

Temperature dependence of rat circadian pacemaker

1981 ◽  
Vol 241 (1) ◽  
pp. R17-R20 ◽  
Author(s):  
F. P. Gibbs
Keyword(s):  
Body Temperature ◽  
Temperature Dependence ◽  
Temperature Compensation ◽  
Biological Clock ◽  
Female Rats ◽  
Circadian Pacemaker ◽  
Dark Cycle ◽  
Ether Anesthesia ◽  
Normal Speed ◽  
Neonatal Stage

Blind female rats were maintained in running-wheel cages in a 12-h light-dark cycle. Hypothermia was induced by ether anesthesia, wetting of the fur by ethanol, and covering with ice. Rats were put in restraining cages and colonic temperatures were maintained between 20 and 32 degrees C for 3-16 h by cooling with ice and water. On recovery from hypothermia, the rats were replaced in their home wheels. Examination of the activity records showed significant phase delays associated with temperatures lower than 28 degrees C. At 20 degrees C, the phase delays indicated that the clock was running at about 64% normal speed giving a mean Q10 of 1.33, which is quite a bit higher than previously reported. It is speculated that, because the rat maintains its body temperature within narrow limits after the neonatal stage, it has lost the precise temperature compensation for the period of its biological clock that has been so well documented in other organisms.

Estimation of Circadian Body Temperature Rhythm Based on Heart Rate in Healthy, Ambulatory Subjects

2017 ◽  
Vol 21 (2) ◽  
pp. 407-415 ◽  
Author(s):  
Soo Young Sim ◽  
Kwang Min Joo ◽  
Han Byul Kim ◽  
Seungjin Jang ◽  
Beomoh Kim ◽  
...  
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm

Milking frequency affects the circadian body temperature rhythm in dairy cows

2008 ◽  
Vol 117 (2-3) ◽  
pp. 130-138 ◽  
Author(s):  
P.E. Kendall ◽  
C.B. Tucker ◽  
D.E. Dalley ◽  
D.A. Clark ◽  
J.R. Webster
Keyword(s):  
Body Temperature ◽  
Dairy Cows ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Milking Frequency
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