Circadian rhythm of core body temperature in two laboratory mouse lines

2005 ◽  
Vol 86 (4) ◽  
pp. 538-545 ◽  
Author(s):  
M CASTILLO ◽  
K HOCHSTETLER ◽  
D GREENE ◽  
S FIRMIN ◽  
R TAVERNIER ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Body Temperature ◽  
Core Body Temperature ◽  
Laboratory Mouse ◽  
Core Body ◽  
Mouse Lines

scholarly journals Changes in blood glucose as a function of body temperature in laboratory mice: implications for daily torpor

2018 ◽  
Vol 315 (4) ◽  
pp. E662-E670 ◽  
Author(s):  
Viviana Lo Martire ◽  
Alice Valli ◽  
Mark J. Bingaman ◽  
Giovanna Zoccoli ◽  
Alessandro Silvani ◽  
...  
Keyword(s):  
Body Temperature ◽  
Core Body Temperature ◽  
Laboratory Mouse ◽  
Glucose Production ◽  
Endogenous Glucose Production ◽  
Limited Food ◽  
Hypometabolic State ◽  
Ad Libitum ◽  
Core Body ◽  
Ad Libitum Feeding

Many small mammals, such as the laboratory mouse, utilize the hypometabolic state of torpor in response to caloric restriction. The signals that relay the lack of fuel to initiate a bout of torpor are not known. Because the mouse will only enter a torpid state when calorically challenged, it may be that one of the inputs for initiation into a bout of torpor is the lack of the primary fuel (glucose) used to power brain metabolism in the mouse. Using glucose telemetry in mice, we tested the hypotheses that 1) circulating glucose (GLC), core body temperature (Tb), and activity are significantly interrelated; and 2) that the level of GLC at the onset of torpor differs from both GLC during arousal from torpor and during feeding when there is no torpor. To test these hypotheses, six C57Bl/6J mice were implanted with glucose telemeters and exposed to different feeding conditions (ad libitum, fasting, limited food intake, and refeeding) to create different levels of GLC and Tb. We found a strong positive and linear correlation between GLC and Tb during ad libitum feeding. Furthermore, mice that were calorically restricted entered torpor bouts readily. GLC was low during torpor entry but did not drop precipitously as Tb did at the onset of a torpor bout. GLC significantly increased during arousal from torpor, indicating the presence of endogenous glucose production. While low GLC itself was not predictive of a bout of torpor, hyperactivity and low GLC preceded the onset of torpor, suggesting that this may be involved in triggering torpor.

The Effects of Thoracic and Cervical Spinal Cord Lesions on the Circadian Rhythm of Core Body Temperature

2011 ◽  
Vol 28 (2) ◽  
pp. 146-154 ◽  
Author(s):  
Dick H. J. Thijssen ◽  
Thijs M. H. Eijsvogels ◽  
Marina Hesse ◽  
Dov B. Ballak ◽  
Greg Atkinson ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Circadian Rhythm ◽  
Body Temperature ◽  
Cervical Spinal Cord ◽  
Core Body Temperature ◽  
Spinal Cord Lesions ◽  
Core Body

scholarly journals Energy intake and the circadian rhythm of core body temperature in sheep

2013 ◽  
Vol 1 (5) ◽  
Author(s):  
Shane K. Maloney ◽  
Leith C. R. Meyer ◽  
D. Blache ◽  
A. Fuller
Keyword(s):  
Circadian Rhythm ◽  
Body Temperature ◽  
Energy Intake ◽  
Core Body Temperature ◽  
Core Body

Circadian rhythm of core body temperature in subjects with chronic fatigue syndrome

2001 ◽  
Vol 21 (2) ◽  
pp. 184-195 ◽  
Author(s):  
Daniel L. Hamilos ◽  
David Nutter ◽  
Josh Gershtenson ◽  
David Ikle ◽  
Sharon Sue Hamilos ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Body Temperature ◽  
Chronic Fatigue Syndrome ◽  
Core Body Temperature ◽  
Chronic Fatigue ◽  
Fatigue Syndrome ◽  
Core Body

Circadian Rhythm Estimation by Core Body Temperature Filtered with Simultaneously Recorded Physiological Data

1997 ◽  
Vol 36 (04/05) ◽  
pp. 306-310 ◽  
Author(s):  
T. Nakano ◽  
E. Koyama ◽  
T. Imai ◽  
H. Hagiwara
Keyword(s):  
Heart Rate ◽  
Circadian Rhythm ◽  
Body Temperature ◽  
Core Body Temperature ◽  
Field Measurements ◽  
Physical Activities ◽  
Temperature Data ◽  
Physiological Data ◽  
Heart Rate Data ◽  
Core Body

Abstract.In field measurements, monitoring of core body temperature is influenced by physical activities; therefore, the estimation of circadian rhythm from the data may not be exact. The purpose of this study is to design a core body temperature filter in order to reduce artifacts induced by physical activities using simultaneously recorded physiological data such as heart rate data.The effects of physical activities on core body temperature and heart rate are assessed through three experiments. Based on the above knowledge, a core body temperature filter was designed. The filter removes part of rectal temperature data as artifact when heart rate rises above a predetermined threshold. As a result, most of the spike-like noise was removed and the filtered temperature data showed sinusoidal variation more than the unfiltered data. The mesor of the estimated rhythm significantly decreased. This filtering method can provide more precise information about circadian rhythm, especially in field measurements.

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