Ultradian Rhythms in Locomotor Activity, Deep Body Temperature and Plasma Corticosterone Levels in Rats: Two Different Origins?

1985 ◽  
pp. 77-94 ◽  
Author(s):  
K. Honma ◽  
S. Honma
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Plasma Corticosterone ◽  
Ultradian Rhythms ◽  
Deep Body Temperature ◽  
Different Origins ◽  
Deep Body

Endogenous ultradian rhythms in rats exposed to prolonged continuous light

1978 ◽  
Vol 235 (5) ◽  
pp. R250-R256 ◽  
Author(s):  
K. I. Honma ◽  
T. Hiroshige
Keyword(s):  
Circadian Rhythm ◽  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Continuous Light ◽  
Plasma Corticosterone ◽  
Ultradian Rhythm ◽  
Ultradian Rhythms ◽  
Serial Sampling ◽  
Free Running

Circadian rhythms of locomotor activity, body temperature, and plasma corticosterone were determined simultaneously in individual rats that were exposed to 200 lx continuous light for over 3 mo. Free-running circadian rhythms of locomotor activity persisted for about 2 mo under continuous light and then the rhythms gradually decomposed. After 3 mo of exposure, circadian rhythms disappeared and activity bursts of 1- to 2-h duration manifested themselves several times during a 24-h period. Body temperature also exhibited several bursts of fluctuation and these bursts were closely correlated in their temporal sequence with those of locomotor activity. A least-squares spectrum analysis revealed that the burst had regular 4- to 6-h periods. Plasma corticosterone, determined by serial sampling at 2-h intervals from individual rats, also exhibited several secretion episodes in a day. These episodic secretions synchronized with bursts of locomotor activity. These results suggest that the ultradian component, manifested under prolonged continuous light, is a fundamental unit of the circadian rhythm and an oscillator for the ultradian rhythm is common to the three functions examined.

Evaluation of a newly developed monitor of deep body temperature

2002 ◽  
Vol 16 (4) ◽  
pp. 354-357 ◽  
Author(s):  
Michiaki Yamakage ◽  
Sohshi Iwasaki ◽  
Akiyoshi Namiki
Keyword(s):  
Body Temperature ◽  
Deep Body Temperature ◽  
Deep Body

Circadian rhythm abnormalities of deep body temperature in depressive disorders

1992 ◽  
Vol 26 (3) ◽  
pp. 191-198 ◽  
Author(s):  
Kazushi Daimon ◽  
Naoto Yamada ◽  
Tetsushi Tsujimoto ◽  
Saburo Takahashi
Keyword(s):  
Circadian Rhythm ◽  
Body Temperature ◽  
Depressive Disorders ◽  
Deep Body Temperature ◽  
Deep Body

Hypothalamic temperature and deep body temperature during copulation in the male rat

1987 ◽  
Vol 39 (3) ◽  
pp. 367-370 ◽  
Author(s):  
Mark S. Blumberg ◽  
Julie A. Mennella ◽  
Howard Moltz
Keyword(s):  
Body Temperature ◽  
Male Rat ◽  
Hypothalamic Temperature ◽  
Deep Body Temperature ◽  
Deep Body

Development of a new method for the noninvasive measurement of deep body temperature without a heater

2010 ◽  
Vol 32 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Kei-Ichiro Kitamura ◽  
Xin Zhu ◽  
Wenxi Chen ◽  
Tetsu Nemoto
Keyword(s):  
Body Temperature ◽  
New Method ◽  
Noninvasive Measurement ◽  
Deep Body Temperature ◽  
Deep Body

THE EFFECTS OF TEMPERATURE ON THE OXYGEN CONSUMPTION, HEART RATE AND DEEP BODY TEMPERATURE DURING DIVING IN THE TUFTED DUCK AYTHYA FULIGULA

1992 ◽  
Vol 163 (1) ◽  
pp. 139-151 ◽  
Author(s):  
R. M. BEVAN ◽  
P. J. BUTLER
Keyword(s):  
Oxygen Consumption ◽  
Body Temperature ◽  
Deep Body Temperature ◽  
Tufted Duck ◽  
Winter Conditions ◽  
Winter Temperatures ◽  
Summer Temperatures ◽  
The Mean ◽  
Maintain Body Temperature ◽  
Deep Body

Six tufted ducks were trained to dive for food at summer temperatures (air, 26°C, water, 23°C) and at winter temperatures (air, 5.8°C, water 7.4°C). The mean resting oxygen consumption (Voo2) a t winter temperatures (rwin) was 90% higher than that at summer temperatures (Tsum), but deep body temperatures (Tb) were not significantly different. Diving behaviour and mean oxygen consumption for dives of mean duration were similar at Twin and at Tsum, although the mean oxygen consumption for surface intervals of mean duration was 50% greater at Twin and Tb was significantly lower (1°C) at the end of a series of dives in winter than it was in summer. There appears to be an energy saving of 67 J per dive during winter conditions and this may, at least partially, be the result of the metabolic heat produced by the active muscles being used to maintain body temperature. While at rest under winter conditions, this would be achieved by shivering thermogenesis. Thus, the energetic costs of foraging in tufted ducks in winter are not as great as might be expected from the almost doubling of metabolic rate in resting birds.

Fetal and maternal temperatures in rabbits

1965 ◽  
Vol 20 (4) ◽  
pp. 737-741 ◽  
Author(s):  
Frederick M. Hart ◽  
J. Job Faber
Keyword(s):  
New Zealand ◽  
Body Temperature ◽  
Heat Loss ◽  
Abdominal Cavity ◽  
Dorsal Surface ◽  
Ventral Surface ◽  
Sodium Pentobarbital ◽  
Deep Body Temperature ◽  
New Zealand White Rabbits ◽  
Deep Body

The differences between fetal deep body temperature and maternal aortic temperature were measured in 10 New Zealand white rabbits of 22—29 days gestation with thermocouples thrust into the fetuses immediately after the animals had been killed by a warmed overdose of sodium pentobarbital. Fetal temperatures exceeded maternal temperatures by —2.51 + 0.099.X °C, where X is the gestational age in days. There is 95% confidence that fetal temperatures exceeded maternal temperature by at least 0.25 °C at a fetal age of 29 days. Permanently implanted thermocouples in six nonpregnant rabbits showed that the ventral surface of the abdominal cavity is colder than the aorta, and that the dorsal surface is slightly warmer. Fetal heat loss is partly via the umbilical circulation and partly via the fetal body surface. tissue temperatures in rabbits; fetal heat loss Submitted on September 28, 1964

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