The Timing of the Human Circadian Clock Is Accurately Represented by the Core Body Temperature Rhythm following Phase Shifts to a Three-Cycle Light Stimulus Near the Critical Zone

2000 ◽  
Vol 15 (6) ◽  
pp. 524-530 ◽  
Author(s):  
Sat Bir S. Khalsa ◽  
Megan E. Jewett ◽  
Jeanne F. Duffy ◽  
Charles A. Czeisler
Keyword(s):  
Body Temperature ◽  
Circadian Clock ◽  
Light Stimulus ◽  
Core Body Temperature ◽  
Phase Shifts ◽  
Critical Zone ◽  
The Core ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Core Body

scholarly journals Heterothermy is associated with reduced fitness in wild rabbits

2017 ◽  
Vol 13 (12) ◽  
pp. 20170521 ◽  
Author(s):  
Shane K. Maloney ◽  
Maija K. Marsh ◽  
Steven R. McLeod ◽  
Andrea Fuller
Keyword(s):  
Body Temperature ◽  
Oryctolagus Cuniculus ◽  
Reproductive Output ◽  
Core Body Temperature ◽  
The Body ◽  
The Core ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Core Body ◽  
Growth And Reproduction

An increase in variation in the 24 h pattern of body temperature (heterothermy) in mammals can be induced by energy and water deficits. Since performance traits such as growth and reproduction also are impacted by energy and water balance, we investigated whether the characteristics of the body temperature rhythm provide an indication of the reproductive success of an individual. We show that the amplitude of the daily rhythm of body temperature in wild rabbits ( Oryctolagus cuniculus ) prior to breeding is inversely related to the number of pregnancies in the subsequent seven months, while the minimum daily body temperature is positively correlated to the number of pregnancies. Because reproductive output could be predicted from characteristics of the core body temperature rhythm prior to the breeding season, we propose that the pattern of the 24 h body temperature rhythm could provide an index of animal fitness in a given environment.

The core body temperature rhythm is altered in progressive supranuclear palsy

2009 ◽  
Vol 19 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Keisuke Suzuki ◽  
Tomoyuki Miyamoto ◽  
Masayuki Miyamoto ◽  
Koichi Hirata
Keyword(s):  
Body Temperature ◽  
Progressive Supranuclear Palsy ◽  
Core Body Temperature ◽  
The Core ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Core Body

Disturbed core body temperature rhythm after major surgery

2004 ◽  
Vol 2 (3) ◽  
pp. 226-228 ◽  
Author(s):  
Ismail GÖGENUR ◽  
Andreas EVERSBUSCH ◽  
Michael ACHIAM ◽  
Pernille SØLVING ◽  
Jacob ROSENBERG
Keyword(s):  
Body Temperature ◽  
Core Body Temperature ◽  
Major Surgery ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Core Body

Modification of circadian body temperature rhythm during the luteal menstrual phase: role of melatonin

1996 ◽  
Vol 80 (1) ◽  
pp. 25-29 ◽  
Author(s):  
A. Cagnacci ◽  
R. Soldani ◽  
G. A. Laughlin ◽  
S. S. Yen
Keyword(s):  
Body Temperature ◽  
Core Body Temperature ◽  
Menstrual Phase ◽  
Temperature Rhythm ◽  
Melatonin Administration ◽  
Early Follicular Phase ◽  
Body Temperature Rhythm ◽  
The Mean ◽  
Core Body

In women during early follicular phase (FP), the rise of melatonin at night accounts for 40% of the nocturnal core body temperature (Tc) decline. In seven normal-cycling women, the circadian rhythms of Tc and melatonin of the FP were compared with those of the luteal phase (LP). In addition, in both phases the Tc response to daytime melatonin administration was investigated. Melatonin levels were comparable during the two menstrual phases, but the nocturnal melatonin onset was delayed by 90 min in the LP (P < 0.01). This was accompanied by a delay of the nadir of the Tc circadian rhythm (P < 0.002), a 0.3 degrees C elevation (P < 0.005) of the mean 24-h value, and a 40% blunting (P < 0.002) of the amplitude. This attenuation of circadian Tc in LP women was replicated in two estrogen-treated hypogonadal women by the administration of medroxyprogesterone acetate. The daytime administration of melatonin (2.5 mg) decreased Tc during the FP (P < 0.01) but was ineffective in the LP. Present data indicate that in LP, in association with high progesterone levels, an attenuated and phase-delayed circadian Tc rhythm may, in part, be due to a reduced effect of melatonin.

Circadian temperature rhythms in rabbit pups and in their does

2001 ◽  
Vol 35 (4) ◽  
pp. 364-373 ◽  
Author(s):  
B. Jilge ◽  
B. Kuhnt ◽  
W. Landerer ◽  
S. Rest
Keyword(s):  
Body Temperature ◽  
Core Body Temperature ◽  
Circadian Oscillator ◽  
Suprachiasmatic Nuclei ◽  
The Core ◽  
Temperature Rhythm ◽  
Pregnancy And Lactation ◽  
Temperature Rhythms ◽  
Milk Ingestion ◽  
Core Body

Circadian rhythms of mammals are generated endogenously, the master oscillator system residing in the suprachiasmatic nuclei (SCN). Previous experiments have indicated that the rabbit has a feeding entrainable circadian oscillator (FEO) which is supposed to be of greatest importance during the early infancy of the rabbit. Here we report the course of telemetrically monitored core body temperature of rabbit pups and of their does. Temperature increased from 37.6 ± 0.3 °C on day 2 to 39.5 ± 0.1 °C on day 28 of life. The pups showed a 24 h temperature rhythm even during their first days of life. Temperature increased 2&frac12;-3 h prior to nursing for 0.4-0.8 °C and rose for an additional 0.4-0.6 °C immediately after milk ingestion. The anticipatory, but not the postprandial component persisted when nursing was skipped twice. The persistence of a rhythm in the absence of any entraining agent is crucial for its endogenous generation. In the doe, the core body temperature gradually decreased during the last 2/3 of pregnancy. During parturition it steeply rose for 1.5-1.7 °C and attained a plateau of 39.7 ± 0.2 °C during lactation. The circadian rhythm persisted during the whole course of pregnancy and lactation. Thus, in the rabbit an endogenous, feeding entrainable circadian oscillator appears to operate from the first days of life. It is of functional significance in that it alerts the pup in time so that it is able to utilize the singular short presence of the doe for maximal milk intake.

scholarly journals Temperature Monitoring and Perioperative Thermoregulation

2008 ◽  
Vol 109 (2) ◽  
pp. 318-338 ◽  
Author(s):  
Daniel I. Sessler ◽  
David S. Warner ◽  
Mark A. Warner
Keyword(s):  
Body Temperature ◽  
General Anesthesia ◽  
Core Temperature ◽  
Core Body Temperature ◽  
Neuraxial Anesthesia ◽  
General Anesthetics ◽  
The Core ◽  
Core Body ◽  
Dose Dependent ◽  
Body Heat

Most clinically available thermometers accurately report the temperature of whatever tissue is being measured. The difficulty is that no reliably core-temperature-measuring sites are completely noninvasive and easy to use-especially in patients not undergoing general anesthesia. Nonetheless, temperature can be reliably measured in most patients. Body temperature should be measured in patients undergoing general anesthesia exceeding 30 min in duration and in patients undergoing major operations during neuraxial anesthesia. Core body temperature is normally tightly regulated. All general anesthetics produce a profound dose-dependent reduction in the core temperature, triggering cold defenses, including arteriovenous shunt vasoconstriction and shivering. Anesthetic-induced impairment of normal thermoregulatory control, with the resulting core-to-peripheral redistribution of body heat, is the primary cause of hypothermia in most patients. Neuraxial anesthesia also impairs thermoregulatory control, although to a lesser extent than does general anesthesia. Prolonged epidural analgesia is associated with hyperthermia whose cause remains unknown.

Monitoring of the core body temperature of cows using implantable wireless thermometers

2019 ◽  
Vol 163 ◽  
pp. 104849 ◽  
Author(s):  
Wataru Iwasaki ◽  
Shuichi Ishida ◽  
Daisuke Kondo ◽  
Yuichi Ito ◽  
Jun Tateno ◽  
...  
Keyword(s):  
Body Temperature ◽  
Core Body Temperature ◽  
The Core ◽  
Core Body

scholarly journals Skipping Breakfast for 6 Days Delayed the Circadian Rhythm of the Body Temperature without Altering Clock Gene Expression in Human Leukocytes

Nutrients ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2797 ◽  
Author(s):  
Hitomi Ogata ◽  
Masaki Horie ◽  
Momoko Kayaba ◽  
Yoshiaki Tanaka ◽  
Akira Ando ◽  
...  
Keyword(s):  
Gene Expression ◽  
Body Temperature ◽  
Clock Gene ◽  
Core Body Temperature ◽  
The Core ◽  
Clock Gene Expression ◽  
Meal Timing ◽  
Dim Light ◽  
Core Body ◽  
Skipping Breakfast

Breakfast is often described as “the most important meal of the day” and human studies have revealed that post-prandial responses are dependent on meal timing, but little is known of the effects of meal timing per se on human circadian rhythms. We evaluated the effects of skipping breakfast for 6 days on core body temperature, dim light melatonin onset, heart rate variability, and clock gene expression in 10 healthy young men, with a repeated-measures design. Subjects were provided an isocaloric diet three times daily (3M) or two times daily (2M, i.e., breakfast skipping condition) over 6 days. Compared with the 3M condition, the diurnal rhythm of the core body temperature in the 2M condition was delayed by 42.0 ± 16.2 min (p = 0.038). On the other hand, dim light melatonin onset, heart rate variability, and clock gene expression were not affected in the 2M condition. Skipping breakfast for 6 days caused a phase delay in the core body temperature in healthy young men, even though the sleep–wake cycle remained unchanged. Chronic effects of skipping breakfast on circadian rhythms remain to be studied.

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