Circadian Rhythms of Serum Thyrotrophin and Body Temperature in Euthyroid Individuals and their Responses to Warming

1984 ◽  
Vol 67 (4) ◽  
pp. 433-437 ◽  
Author(s):  
B. P. O'malley ◽  
A. Richardson ◽  
N. Cook ◽  
S. Swart ◽  
F. D. Rosenthal
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Diurnal Rhythm ◽  
Normal Subjects ◽  
The Body ◽  
Diurnal Rhythms ◽  
Tsh Levels

1. The diurnal rhythms of body temperature and serum thyrotrophin (TSH) levels in euthyroid individuals behaved inversely to one another. 2. An artificially induced rise in the body temperature of these individuals was accompanied by a fall in serum thyrotrophin levels, the amplitudes of their respective rhythms decreasing simultaneously. 3. There was a marked correlation between the degrees of change in body temperature and circulating thyrotrophin levels respectively during warming. 4. In normal subjects manipulation of the diurnal rhythm of body temperature brings about inverse alterations in the thyrotrophin rhythm.

Ballistocardiographic response to hyperthermia

1960 ◽  
Vol 15 (3) ◽  
pp. 445-448 ◽  
Author(s):  
Arthur J. Moss ◽  
Bruce E. Bradley
Keyword(s):  
Body Temperature ◽  
Cardiovascular Response ◽  
Peripheral Resistance ◽  
Low Frequency ◽  
Normal Subjects ◽  
The Body ◽  
Ventricular Ejection ◽  
Time Duration ◽  
J Wave

The body temperature of five normal subjects was raised to levels above 100.0°F through the use of a rubberized anti-exposure suit. The induced hyperkinetic cardiovascular state was studied on an ultra-low-frequency force ballistocardiogram. The ejection deflection (HI wave) consistently increased in amplitude and became more vertical during the hyperthermic state. The time duration from the onset of ventricular ejection to the J wave peak generally was shortened. These changes were interpreted in terms of the known cardiovascular response to the hyperkinetic state. Diminished peripheral resistance and its sequelae seemed to play a major role in the ballistocardiographic changes seen with hyperthermia. Submitted on November 23, 1959

scholarly journals XII.—The Effect of changing the Daily Routine on the Diurnal Rhythm in Body Temperature

1912 ◽  
Vol 48 (2) ◽  
pp. 231-261
Author(s):  
Sutherland Simpson
Keyword(s):  
Body Temperature ◽  
Diurnal Variation ◽  
Diurnal Rhythm ◽  
Temperature Curve ◽  
The Body ◽  
Daily Routine ◽  
Combined Effects ◽  
Diurnal Temperature ◽  
The Subject ◽  
The Individual

To determine whether the diurnal variation in body temperature is due to the combined effects of the various influences which are known to act upon it, such as muscular exercise, the ingestion of food, sleep, etc., or is present independently of these, the daily routine of the individual who is the subject of the experiment may be reversed artificially by causing him to work during the night and rest and sleep during the day, or it may be modified in another way, viz. by rapidly changing his longitude in a journey from west to east, or vice versa. If the temperature of the body is dependent on the influences mentioned, then a total reversal of the daily routine, or any modification of it, should produce a corresponding change in the diurnal temperature curve.

Impairment of heme biosynthesis induces short circadian period in body temperature rhythms in mice

2012 ◽  
Vol 303 (1) ◽  
pp. R8-R18 ◽  
Author(s):  
Reiko Iwadate ◽  
Yoko Satoh ◽  
Yukino Watanabe ◽  
Hiroshi Kawai ◽  
Naomi Kudo ◽  
...  
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Core Body Temperature ◽  
Intraperitoneal Administration ◽  
Biological Rhythms ◽  
Heme Biosynthesis ◽  
Diurnal Rhythms ◽  
Phase Advance ◽  
Constant Darkness ◽  
Acute Porphyria

It has been demonstrated that the function of mammalian clock gene transcripts is controlled by the binding of heme in vitro. To examine the effects of heme on biological rhythms in vivo, we measured locomotor activity (LA) and core body temperature (Tb) in a mouse model of porphyria with impaired heme biosynthesis by feeding mice a griseofulvin (GF)-containing diet. Mice fed with a 2.0% GF-containing diet (GF2.0) transiently exhibited phase advance or phase advance-like phenomenon by 1–3 h in terms of the biological rhythms of Tbor LA, respectively (both, P < 0.05) while mice were kept under conditions of a light/dark cycle (12 h:12 h). We also observed a transient, ∼0.3 h shortening of the period of circadian Tbrhythms in mice kept under conditions of constant darkness ( P < 0.01). Interestingly, the observed duration of abnormal circadian rhythms in GF2.0 mice lasted between 1 and 3 wk after the onset of GF ingestion; this finding correlated well with the extent of impairment of heme biosynthesis. When we examined the effects of therapeutic agents for acute porphyria, heme, and hypertonic glucose on the pathological status of GF2.0 mice, it was found that the intraperitoneal administration of heme (10 mg·kg−1·day−1) or glucose (9 g·kg−1·day−1) for 7 days partially reversed (50%) increases in urinary δ-aminolevulinic acids levels associated with acute porphyria. Treatment with heme, but not with glucose, suppressed the phase advance (-like phenomenon) in the diurnal rhythms ( P < 0.05) and restored the decrease of heme ( P < 0.01) in GF2.0 mice. These results suggest that impairments of heme biosynthesis, in particular a decrease in heme, may affect phase and period of circadian rhythms in animals.

scholarly journals Circadian Sensation and Visual Perception

2021 ◽  
Author(s):  
Michael Jackson Oliveira de Andrade
Keyword(s):  
Nervous System ◽  
Reaction Time ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Visual Perception ◽  
Biological Rhythms ◽  
The Body ◽  
Perception Time ◽  
Sensory Activity ◽  
Attention Memory

The physiology of living beings presents oscillations that are known as biological rhythms. The most studied rhythm is called circadian (circa = circa, dies = day), because it varies with a period close to 24h. Most functions of the body have circadian variations, one can mention, for example, metabolism, body temperature, the activity of the nervous system, secretion of hormones such as melatonin and cortisol. Circadian rhythms were also found in human behavior, for example: in sensory activity, motor activity, reaction time, visual perception, auditory perception, time perception, attention, memory, arithmetic calculus, and executive functions. The present work reviews the visual path that participates in the synchronization of circadian rhythms, as well as the evidence that exists about the presence of circadian rhythms in the sensation and visual perception of the human being.

Free-Running Human Circadian Rhythms in Svalbard

1979 ◽  
Vol 34 (5-6) ◽  
pp. 470-473 ◽  
Author(s):  
A. Johnsson ◽  
W. Engelmann ◽  
W. Klemke ◽  
Aud Tveito Ekse
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Continuous Light ◽  
Circadian System ◽  
The Body ◽  
The Arctic ◽  
Light Conditions ◽  
Temperature Recording ◽  
Rest Time ◽  
Free Running

Abstract The body temperature, activity-rest time, electrolytes of urine samples and mood was measured in two persons during a 19 day period under continuous light conditions in the arctic (vicinity of Ny Ålesund, Svalbard-Spitsbergen). For temperature recording a new thermoprobe and a portable printer was used. Possible week Zeitgeber of the 24 hour day did not synchronize the circadian system, since circadian rhythms of about 26 hours were found. These results open up the pos­ sibility to study effects of drugs on the circadian system of humans under Svalbard conditions.

scholarly journals The Composition of Human Perspiration (Samuel Hyde Memorial Lecture)

1934 ◽  
Vol 27 (7) ◽  
pp. 839-848 ◽  
Author(s):  
B. A. McSwiney
Keyword(s):  
Nervous System ◽  
Lactic Acid ◽  
Body Temperature ◽  
Normal Subjects ◽  
The Body ◽  
Sweat Glands ◽  
Memorial Lecture ◽  
Acetyl Choline ◽  
Warm Blood ◽  
Stimulation Of

Water given off by the skin is classified as insensible and sensible perspiration. Under normal conditions about 600 to 700 c.c. is evaporated from the skin in twentyfour hours. The chief physiological significance of the perspiration is to assist in regulating the body temperature. The constituents of perspiration are very variable. The average values calculated from the examination of fourteen male specimens and ten female specimens are given below:— [Formula: see text] Examination of the figures obtained for the sweat shed by rheumatic subjects shows no marked divergence from those recorded for normal subjects. Lactic acid is stated to be present in relatively large amounts in sweat, but these results have not been confirmed. Moss (1923) demonstrated the importance of the loss of chloride which occurred during continued sweating. He showed that symptoms of water-poisoning occurred when men engaged in hard work in hot places drank water freely. Hancock, Whitehouse and Haldane (1930) point out that the percentage of chloride in sweat increases markedly with duration of sweating, and suggest that water poisoning is due to an alteration in the diffusion pressure of water in the body. The secretion is under control of the nervous system, and is normally excited through stimulation of the centres by warm blood. The sweat-glands are innervated by fibres of the sympathetic system. Adrenaline has, however, no action on the glands, while pilocarpine excites and atropine paralyses. Recent investigations suggest that acetyl-choline is liberated at the nerve-endings.

Two circadian rhythms in the human electroencephalogram during wakefulness

1999 ◽  
Vol 277 (6) ◽  
pp. R1771-R1779 ◽  
Author(s):  
Daniel Aeschbach ◽  
Jeffery R. Matthews ◽  
Teodor T. Postolache ◽  
Michael A. Jackson ◽  
Holly A. Giesen ◽  
...  
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Power Density ◽  
High Frequency ◽  
Spectral Power ◽  
The Body ◽  
Temporal Association ◽  
Alpha Band ◽  
Theta Band ◽  
Time Awake

The influence of the circadian pacemaker and of the duration of time awake on the electroencephalogram (EEG) was investigated in 19 humans during ∼40 h of sustained wakefulness. Two circadian rhythms in spectral power density were educed. The first rhythm was centered in the theta band (4.25–8.0 Hz) and exhibited a minimum ∼1 h after the onset of melatonin secretion. The second rhythm was centered in the high-frequency alpha band (10.25–13.0 Hz) and exhibited a minimum close to the body temperature minimum. The latter rhythm showed a close temporal association with the rhythms in subjective alertness, plasma melatonin, and body temperature. In addition, increasing time awake was associated with an increase of power density in the 0.25- to 9.0-Hz and 13.25- to 20.0-Hz ranges. It is concluded that the waking EEG undergoes changes that can be attributed to circadian and homeostatic (i.e., sleep-wake dependent) processes. The distinct circadian variations of EEG activity in the theta band and in the high-frequency alpha band may represent electrophysiological correlates of different aspects of the circadian rhythm in arousal.

Effect of gastrointestinal flora on body temperature of rats and mice

1990 ◽  
Vol 258 (2) ◽  
pp. R552-R557 ◽  
Author(s):  
M. J. Kluger ◽  
C. A. Conn ◽  
B. Franklin ◽  
R. Freter ◽  
G. D. Abrams
Keyword(s):  
Drinking Water ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Marked Decrease ◽  
The Body ◽  
Body Temperatures ◽  
Gut Flora ◽  
Nighttime Temperatures ◽  
Rats And Mice

The purpose of these experiments was to test the hypothesis that gut flora influences the body temperature of rodents. Rats and mice were implanted with biotelemetry transmitters that enabled us to record both abdominal temperature and activity for long periods of time. Rats given nonabsorbable antibiotics in their drinking water, which reduced their gut flora, had a marked decrease in both their daytime and nighttime temperatures. Similar results were found with germfree mice. The circadian rhythms in body temperature of germfree and conventionalized mice were not different. However, the body temperatures of the germfree mice were lower than those of the conventionalized mice during both the daytime and nighttime. The decrease in body temperature in the germfree mice was not related to changes in activity. These results support the hypothesis that gut flora has a tonic stimulatory effect on both the daytime and nighttime body temperature of rodents.

Antipyretic Plants: An Updated Review

2020 ◽  
Vol 16 (1) ◽  
pp. 4-12
Author(s):  
Vandana Garg ◽  
Rohit Dutt
Keyword(s):  
Side Effects ◽  
Body Temperature ◽  
Medicinal Plants ◽  
Inflammatory Mediators ◽  
Review Paper ◽  
The Body ◽  
Hypothalamic Area ◽  
Antipyretic Activity ◽  
Disease States ◽  
Elevated Body Temperature

Background: Fever, is known as pyrexia, may occur due to infection, inflammation, or any tissue damage and disease states. Normally, the infected or damaged tissue initiates the enhanced formation of pro-inflammatory mediators like cytokines which further increases the synthesis of prostaglandin E2 (PgE2) near the hypothalamic area and thereby trigger the hypothalamus to elevate the body temperature. Objective: Antipyretics are the agents which reduce the elevated body temperature. The most commonly used antipyretic agent, paracetamol, may be fatal due to its side effects. Methods: In this review paper, Chemical Abstracts, Google Scholar, PubMed, and Science Direct were the sources for the published article to collect information regarding antipyretic activity. Results: This review compiles the antipyretic plants that may be useful to treat fever due to various diseases. Conclusion: These medicinal plants could be good alternatives for traditional allopathic antipyretics.

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