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core body temperature circadian rhythm

Stefan Mendt, Martina Anna Maggioni, Michael Nordine, Mathias Steinach, Oliver Opatz, Daniel Belavý, Dieter Felsenberg, Jochim Koch, Peng Shang, Hanns-Christian Gunga, Alexander Stahn
Continuous recordings of core body temperature (CBT) are a well-established approach in describing circadian rhythms. Given the discomfort of invasive CBT measurement techniques, the use of skin temperature recordings has been proposed as a surrogate. More recently, we proposed a heat-flux approach (the so-called Double Sensor) for monitoring CBT. Studies investigating the reliability of the heat-flux approach over a 24-hour period, as well as comparisons with skin temperature recordings, are however lacking...
October 11, 2016: Chronobiology International
Diane B Boivin, Ari Shechter, Philippe Boudreau, Esmot Ara Begum, Ng Mien Kwong Ng Ying-Kin
This study quantifies sex differences in the diurnal and circadian variation of sleep and waking while controlling for menstrual cycle phase and hormonal contraceptive use. We compared the diurnal and circadian variation of sleep and alertness of 8 women studied during two phases of the menstrual cycle and 3 women studied during their midfollicular phase with that of 15 men. Participants underwent an ultradian sleep-wake cycle (USW) procedure consisting of 36 cycles of 60-min wake episodes alternating with 60-min nap opportunities...
September 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
Christine M Walsh, Leslie Ruoff, Jonathan Varbel, Kathleen Walker, Lea T Grinberg, Adam L Boxer, Joel H Kramer, Bruce L Miller, Thomas C Neylan
OBJECTIVE/BACKGROUND: The brainstem is among the first regions affected in progressive supranuclear palsy (PSP) and is part of the sleep/circadian regulation network. In two small studies, blood pressure and core body temperature circadian patterns were disrupted in PSP; however, it is unclear if circadian activity rhythms are also affected. Our objective was to perform circadian analyses of the rest-activity rhythms in PSP and determine the association with increasing disease severity...
June 2016: Sleep Medicine
Ahmed A Al-Haidary, Khalid A Abdoun, Emad M Samara, Aly B Okab, Mamane Sani, Roberto Refinetti
Camels are well adapted to hot arid environments and can contribute significantly to the economy of developing countries in arid regions of the world. Full understanding of the physiology of camels requires understanding of the internal temporal order of the body, as reflected in daily or circadian rhythms. In the current study, we investigated the daily rhythmicity of 20 physiological variables in camels exposed to natural oscillations of ambient temperature in a desert environment and compared the daily temporal courses of the variables...
August 2016: Research in Veterinary Science
Bun Tsuji, Yasushi Honda, Narihiko Kondo, Takeshi Nishiyasu
We investigated whether heat-induced hyperventilation during exercise is affected by time of day, as diurnal variation leads to higher core temperatures in the evening. Nineteen male subjects were divided into two experiments (protocol 1, n = 10 and protocol 2, n = 9). In protocol 1, subjects performed cycle exercise at 50% peak oxygen uptake in the heat (37°C and 50% RH) in the morning (0600) and evening (1800). Results showed that baseline resting and exercising esophageal temperature (Tes) were significantly (0...
August 1, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Gorica Micic, Nicole Lovato, Michael Gradisar, Helen J Burgess, Sally A Ferguson, Leon Lack
Our objectives were to investigate the period lengths (i.e., taus) of the endogenous core body temperature rhythm and melatonin rhythm in delayed sleep-wake phase disorder patients (DSWPD) and non-24-h sleep-wake rhythm disorder patients (N24SWD) compared with normally entrained individuals. Circadian rhythms were measured during an 80-h ultradian modified constant routine consisting of 80 ultrashort 1-h "days" in which participants had 20-min sleep opportunities alternating with 40 min of enforced wakefulness...
August 2016: Journal of Biological Rhythms
Erika Navarrete, Juan Roberto Ortega-Bernal, Lucero Trejo-Muñoz, Georgina Díaz, Rodrigo Montúfar-Chaveznava, Ivette Caldelas
Experimental evidence indicates that during pre-visual stages of development in mammals, circadian regulation is still not under the control of the light-entrainable hypothalamic pacemaker, raising the possibility that the circadian rhythmicity that occurs during postnatal development is under the control of peripheral oscillators, such as the main olfactory bulb (MOB). We evaluated the outcome of olfactory bulbectomy on the temporal pattern of core body temperature and gross locomotor activity in newborn rabbits...
2016: PloS One
Marco Preußner, Florian Heyd
Many aspects of human physiology and behavior display rhythmicity with a period of approximately 24 h. Rhythmic changes are controlled by an endogenous time keeper, the circadian clock, and include sleep-wake cycles, physical and mental performance capability, blood pressure, and body temperature. Consequently, many diseases, such as metabolic, sleep, autoimmune and mental disorders and cancer, are connected to the circadian rhythm. The development of therapies that take circadian biology into account is thus a promising strategy to improve treatments of diverse disorders, ranging from allergic syndromes to cancer...
June 2016: Pflügers Archiv: European Journal of Physiology
Yuki Yasumoto, Chiaki Hashimoto, Reiko Nakao, Haruka Yamazaki, Hanako Hiroyama, Tadashi Nemoto, Saori Yamamoto, Mutsumi Sakurai, Hideaki Oike, Naoyuki Wada, Chikako Yoshida-Noro, Katsutaka Oishi
BACKGROUND: The circadian clock regulates various physiological and behavioral rhythms such as feeding and locomotor activity. Feeding at unusual times of the day (inactive phase) is thought to be associated with obesity and metabolic disorders in experimental animals and in humans. OBJECTIVE: The present study aimed to determine the underlying mechanisms through which time-of-day-dependent feeding influences metabolic homeostasis. METHODS: We compared food consumption, wheel-running activity, core body temperature, hormonal and metabolic variables in blood, lipid accumulation in the liver, circadian expression of clock and metabolic genes in peripheral tissues, and body weight gain between mice fed only during the sleep phase (DF, daytime feeding) and those fed only during the active phase (NF, nighttime feeding)...
May 2016: Metabolism: Clinical and Experimental
S L Christiansen, K Højgaard, O Wiborg, E V Bouzinova
Disturbances of circadian rhythms have been suggested to be a causal factor in the development of major depressive disorder. However, the mechanisms underlying the association between circadian rhythm abnormalities and mood disorders are still unknown. In the current study the association between diurnal pattern of key phase markers (melatonin, corticosterone, and core body temperature) and anhedonic-like behavior was investigated using the highly validated rat chronic mild stress (CMS) model of depression...
September 2016: Neuroscience Research
A Wirz-Justice, K Kräuchi, D P Brunner, P Graw, H J Haug, G Leonhardt, A Sarrafzadeh, J English, J Arendt
Seasonal affective disorder (SAD) is characterised by recurrent episodes in autumn and winter of depression, hypersomnia, augmented appetite with carbohydrate craving, and weight gain, and can be successfully treated with bright light. Circadian rhythm hypotheses (summarized in) have stimulated research into the pathophysiology of SAD, postulating that: 1.The illness is a consequence of delayed phase position, 2.It is correlated with diminished circadian amplitude, or 3.It results from changes in the nocturnal duration between dusk and dawn e...
June 1995: Acta Neuropsychiatrica
Davina Derous, Sharon E Mitchell, Cara L Green, Luonan Chen, Jing-Dong J Han, Yingchun Wang, Daniel E L Promislow, David Lusseau, John R Speakman, Alex Douglas
Food intake and circadian rhythms are regulated by hypothalamic neuropeptides and circulating hormones, which could mediate the anti-ageing effect of calorie restriction (CR). We tested whether these two signaling pathways mediate CR by quantifying hypothalamic transcripts of male C57BL/6 mice exposed to graded levels of CR (10 % to 40 %) for 3 months. We found that the graded CR manipulation resulted in upregulation of core circadian rhythm genes, which correlated negatively with circulating levels of leptin, insulin-like growth factor 1 (IGF-1), insulin, and tumor necrosis factor alpha (TNF-α)...
April 2016: Aging
Ming Huang, Toshiyo Tamura, Zunyi Tang, Wenxi Chen, Shigehiko Kanaya
A wearable thermometry for core body temperature (CBT) measurement has both healthcare and clinical applications. On the basis of the mechanism of bioheat transfer, we earlier designed and improved a wearable thermometry using the dualheat- flux method for CBT measurement. In this study, this thermometry is examined experimentally. We studied a fastchanging CBT measurement (FCCM, 55 min, 12 subjects) inside a thermostatic chamber and performed long-term monitoring of CBT (LTM, 24 h, 6 subjects). When compared with a reference, the CoreTemp CM-210 by Terumo, FCCM shows 0...
February 23, 2016: IEEE Journal of Biomedical and Health Informatics
Soo Young Sim, Kwang Min Joo, Han Byul Kim, Seung Jin Jang, Beom Oh Kim, Seung Bum Hong, Sungwan Kim, Kwang Suk Park
Core body temperature is a reliable marker for circadian rhythm. As characteristics of circadian body temperature rhythm change during diverse health problems, such as sleep disorder and depression, body temperature monitoring is often used in clinical diagnosis and treatment. However, the use of current thermometers in circadian rhythm monitoring is impractical in daily life. As heart rate is a physiological signal relevant to thermoregulation, we investigated the feasibility of heart rate monitoring in estimating circadian body temperature rhythm...
February 19, 2016: IEEE Journal of Biomedical and Health Informatics
Rong Guo, Steve M Simasko, Heiko T Jansen
BACKGROUND: Circadian rhythms are essential for adapting to the environment. Chronic alcohol consumption often leads to sleep and circadian disruptions, which may impair the life quality of individuals with alcohol use disorders and contribute to the morbidity associated with alcoholism. METHODS: We used a pair-feeding liquid diet alcohol exposure protocol (6 weeks duration) in PER1::LUC transgenic rats to examine the effects of chronic alcohol exposure on: (i) diurnal rhythms of core body temperature and locomotor activity, (ii) plasma corticosterone (CORT) concentrations, and (iii) rhythms of ex vivo Period1 (Per1) expression in the suprachiasmatic nucleus (SCN), pituitary, and adrenal glands...
February 2016: Alcoholism, Clinical and Experimental Research
Charli Sargent, Xuan Zhou, Raymond W Matthews, David Darwent, Gregory D Roach
The impact of sleep restriction on the endogenous circadian rhythms of hunger and satiety were examined in 28 healthy young men. Participants were scheduled to 2 × 24-h days of baseline followed by 8 × 28-h days of forced desynchrony during which sleep was either moderately restricted (equivalent to 6 h in bed/24 h; n = 14) or severely restricted (equivalent to 4 h in bed/24 h; n = 14). Self-reported hunger and satisfaction were assessed every 2.5 h during wake periods using visual analogue scales. Participants were served standardised meals and snacks at regular intervals and were not permitted to eat ad libitum...
February 2016: International Journal of Environmental Research and Public Health
S Yeim, C Boudebesse, B Etain, F Belliviera
INTRODUCTION: Bipolar disorder is a severe and complex multifactorial disease, characterized by alternance of acute episodes of depression and mania/hypomania, interspaced by euthymic periods. The etiological determinants of bipolar disorder yet, are still poorly understood. For the last 30 years, chronobiology is an important field of investigation to better understand the pathophysiology of bipolar disorder. METHODS: We conducted a review using Medline, ISI Database, EMBase, PsyInfo up to January 2015, using the following keywords combinations: "mood disorder", "bipolar disorder", "depression", "unipolar disorder", "major depressive disorder", "affective disorder", for psychiatric conditions; and "circadian rhythms", "circadian markers", "circadian gene", "clock gene", "melatonin" for circadian rhythms...
September 2015: L'Encéphale
Florina Nechita, Mihail Cristian Pîrlog, Anca Livia ChiriŢă
Depression leads to disturbances in physiological rhythms, which result in disturbances in circadian sleep-wake cycles, hormonal secretion patterns and fluctuations in mood, all of which can be objectively measured. These disturbances, which are associated with depression, can be also used to define depression. Beyond these "transversal" time-related symptoms, there are the "longitudinal" time-related symptoms, since depression evolves over a long period of time, with a profound impact on a person's life and is often associated with long-term psychosocial consequences (Mendlewicz, 2010)...
2015: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
Takeru Matsumura, Hikaru Nakagawa, Kota Suzuki, Chisa Ninomiya, Takayuki Ishiwata
Brain monoamines - such as noradrenaline (NA), dopamine (DA) and serotonin (5-HT) - regulate several important physiological functions, including the circadian rhythm. The purpose of this study was to examine changes in NA, DA and 5-HT levels in various brain regions and their effect on core body temperature (Tc), heart rate (HR) and locomotor activity (Act) in rats following exposure to an artificial light/dark (LD) cycle. For this, male Wistar rats were housed at an ambient temperature (Ta) of 23 °C and 50% relative humidity with free access to food and water...
2015: Chronobiology International
Raymond W Matthews, Sally A Ferguson, Charli Sargent, Xuan Zhou, Anastasi Kosmadopoulos, Gregory D Roach
There is some evidence that short interstimulus intervals (ISIs) on the Psychomotor Vigilance Test (PVT) are associated with longer and more varied reaction times (RTs). Preparation processes may impede RT following short ISIs, resulting in additional unexplained variance. The aims of this study were to investigate whether there is an effect of ISI on RT and errors within the PVT, and whether such an effect changes with three elements of fatigue: time of day, prior wake and time on task. Twelve male participants completed 49 PVTs across 7× 28h periods of forced desynchrony...
November 9, 2015: Accident; Analysis and Prevention
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