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core body temperature circadian phase

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https://www.readbyqxmd.com/read/29247670/sleep-on-a-high-heat-capacity-mattress-increases-conductive-body-heat-loss-and-slow-wave-sleep
#1
Kurt Kräuchi, Elisa Fattori, Alessandra Giordano, Maria Falbo, Antonella Iadarola, Francesca Aglì, Antonella Tribolo, Roberto Mutani, Alessandro Cicolin
Environmental temperature can strongly affect sleep. The habitual sleep phase is usually located between evening decline and morning rise of the circadian rhythm of core body temperature (CBT). However, the thermophysiological mechanisms promoting or disturbing sleep are not yet fully understood. The purpose of this study was to examine the effects of a high heat capacity mattress (HHCM) on CBT, skin temperatures and sleep in comparison to a conventional low heat capacity mattress (LHCM). Based on the higher heat capacity of HHCM an increase in conductive body heat loss enhances the nocturnal decline in CBT can be expected...
March 1, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29138967/mice-lacking-egr1-have-impaired-clock-gene-bmal1-oscillation-locomotor-activity-and-body-temperature
#2
Casper Schwartz Riedel, Birgitte Georg, Henrik L Jørgensen, Jens Hannibal, Jan Fahrenkrug
Early growth response transcription factor 1 (EGR1) is expressed in the suprachiasmatic nucleus (SCN) after light stimulation. We used EGR1-deficient mice to address the role of EGR1 in the clock function and light-induced resetting of the clock. The diurnal rhythms of expression of the clock genes BMAL1 and PER1 in the SCN were evaluated by semi-quantitative in situ hybridization. We found no difference in the expression of PER1 mRNA between wildtype and EGR1-deficient mice; however, the daily rhythm of BMAL1 mRNA was completely abolished in the EGR1-deficient mice...
January 2018: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29128213/the-effects-of-feeding-a-partial-mixed-ration-plus-a-top-dress-before-feeding-on-milk-production-and-the-daily-rhythm-of-feed-intake-and-plasma-hormones-and-metabolites-in-dairy-cows
#3
M Niu, K J Harvatine
Total mixed rations (TMR) are commonly fed to dairy cows with a goal of reducing ruminal acidosis, but the daily pattern of feed intake has major implication for rumen fermentation and postabsorptive physiology. Generally there is low feed intake during the overnight period and high intake after feeding and during the afternoon. The objective of this study was to determine if feeding a partial mixed ration (PMR) plus a high starch top-dress before feeding of the PMR would improve production and modify key daily rhythms...
January 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29082805/identification-and-prediction-of-the-fertile-window-with-a-new-web-based-medical-device-using-a-vaginal-biosensor-for-measuring-the-circadian-and-circamensual-core-body-temperature
#4
Pedro-Antonio Regidor, Marta Kaczmarczyk, Esther Schiweck, Maren Goeckenjan-Festag, Henry Alexander
Fertility awareness-based (FAB) methods represent a term that includes all family planning methods that are based on the identification of the fertile window. They are based on the woman's observation of physiological signs of the fertile and infertile phases of the menstrual cycle. The first approach consists basically in symptothermal methods accompanied by cervical mucus measurements and clinical menstrual cycling data recording. The second most often used methods are the urinary measurement of E3G and luteinizing hormone (LH) with a personalized computer system...
October 28, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28711776/sleep-wake-profiles-and-circadian-rhythms-of-core-temperature-and-melatonin-in-young-people-with-affective-disorders
#5
Joanne S Carpenter, Rébecca Robillard, Daniel F Hermens, Sharon L Naismith, Christopher Gordon, Elizabeth M Scott, Ian B Hickie
While disturbances of the sleep-wake cycle are common in people with affective disorders, the characteristics of these disturbances differ greatly between individuals. This heterogeneity is likely to reflect multiple underlying pathophysiologies, with different perturbations in circadian systems contributing to the variation in sleep-wake cycle disturbances. Such disturbances may be particularly relevant in adolescents and young adults with affective disorders as circadian rhythms undergo considerable change during this key developmental period...
November 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28626157/protein-restriction-does-not-affect-body-temperature-pattern-in-female-mice
#6
Goro A Kato, Hiroki Shichijo, Toshihiro Takahashi, Akio Shinohara, Tetsuo Morita, Chihiro Koshimoto
Daily torpor is a physiological adaptation in mammals and birds characterized by a controlled reduction of metabolic rate and body temperature during the resting phase of circadian rhythms. In laboratory mice, daily torpor is induced by dietary caloric restriction. However, it is not known which nutrients are related to daily torpor expression. To determine whether dietary protein is a key factor in inducing daily torpor in mice, we fed mice a protein-restricted (PR) diet that included only one-quarter of the amount of protein but the same caloric level as a control (C) diet...
October 30, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28576852/neurocardiovascular-deficits-in-the-q175-mouse-model-of-huntington-s-disease
#7
Tamara S Cutler, Saemi Park, Dawn H Loh, Maria C Jordan, Tomohiro Yokota, Kenneth P Roos, Cristina A Ghiani, Christopher S Colwell
Cardiovascular dysautonomia as well as the deterioration of circadian rhythms are among the earliest detectable pathophysiological changes in individuals with Huntington's disease (HD). Preclinical research requires mouse models that recapitulate disease symptoms and the Q175 knock-in model offers a number of advantages but potential autonomic dysfunction has not been explored. In this study, we sought to test the dual hypotheses that cardiovascular dysautonomia can be detected early in disease progression in the Q175 model and that this dysfunction varies with the daily cycle...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28569119/skin-temperature-rhythms-in-humans-respond-to-changes-in-the-timing-of-sleep-and-light
#8
Marc Cuesta, Philippe Boudreau, Nicolas Cermakian, Diane B Boivin
Body temperature is known to vary with circadian phase and to be influenced by factors that can mask its circadian expression. We wanted to test whether skin temperature rhythms were sensitive to an abrupt shift of the sleep schedule and to the resetting effects of light. Nineteen healthy subjects spent 6 days in time isolation and underwent a simulated night-shift procedure. They were assigned to either a control group ( n = 10) or bright light group ( n = 9) and measurements were taken under a baseline day-oriented schedule and during the 4(th) cycle of a night-oriented schedule...
June 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/28438982/the-histaminergic-system-is-involved-in-psychological-stress-induced-hyperthermia-in-rats
#9
Battuvshin Lkhagvasuren, Takakazu Oka
The histaminergic system modulates numerous physiological functions such as wakefulness, circadian rhythm, feeding, and thermoregulation. However, it is not yet known if this system is also involved in psychological stress-induced hyperthermia (PSH) and, if so, which histamine (H) receptor subtype mediates the effect. Therefore, we investigated the effects of pretreatments with intraperitoneal injections of mepyramine (an H1 receptor inverse agonist), cimetidine (an H2 receptor antagonist), and ciproxifan (an H3 receptor inverse agonist) on cage-exchange stress-induced hyperthermia (a model of PSH) by monitoring core body temperature (Tc) during both light (10:00 am-12:00 pm) and dark (10:00 pm-12:00 am) phases in conscious, freely moving rats...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28264977/constant-light-desynchronizes-olfactory-versus-object-and-visuospatial-recognition-memory-performance
#10
Shu K E Tam, Sibah Hasan, Harry M C Choi, Laurence A Brown, Aarti Jagannath, Steven Hughes, Mark W Hankins, Russell G Foster, Vladyslav V Vyazovskiy, David M Bannerman, Stuart N Peirson
Circadian rhythms optimize physiology and behavior to the varying demands of the 24 h day. The master circadian clock is located in the suprachiasmatic nuclei (SCN) of the hypothalamus and it regulates circadian oscillators in tissues throughout the body to prevent internal desynchrony. Here, we demonstrate for the first time that, under standard 12 h:12 h light/dark (LD) cycles, object, visuospatial, and olfactory recognition performance in C57BL/6J mice is consistently better at midday relative to midnight...
March 29, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28216802/constraint-is-associated-with-earlier-circadian-phase-and-morningness-confirmation-of-relationships-between-personality-and-circadian-phase-using-a-constant-routine-protocol
#11
B Bullock, G Murray, J L Anderson, T Cooper-O'Neill, J J Gooley, S W Cain, S W Lockley
Associations among personality, diurnal preference, and circadian phase were investigated using a constant routine laboratory protocol. One hundred and sixty-eight healthy participants aged 18-30 years (Women n = 68) completed either a 30- or 50-hour constant routine under dim-light conditions (<3 lux), during which circadian phase was measured from core body temperature and melatonin. Prior to laboratory admission, self-report measures of personality and diurnal preference were also obtained. The personality trait of Constraint correlated positively with morning diurnal preference and earlier circadian phase, with circadian phase partially mediating the relationship between Constraint and diurnal preference...
January 2017: Personality and Individual Differences
https://www.readbyqxmd.com/read/27726448/circadian-rhythms-in-bed-rest-monitoring-core-body-temperature-via-heat-flux-approach-is-superior-to-skin-surface-temperature
#12
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...
2017: Chronobiology International
https://www.readbyqxmd.com/read/27621470/diurnal-and-circadian-variation-of-sleep-and-alertness-in-men-vs-naturally-cycling-women
#13
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
https://www.readbyqxmd.com/read/27611743/can-the-circadian-phase-be-estimated-from-self-reported-sleep-timing-in-patients-with-delayed-sleep-wake-phase-disorder-to-guide-timing-of-chronobiologic-treatment
#14
Nicole Lovato, Gorica Micic, Michael Gradisar, Sally A Ferguson, Helen J Burgess, David J Kennaway, Leon Lack
INTRODUCTION: The efficacy of bright light and/or melatonin treatment for Delayed Sleep Wake Phase Disorder (DSWPD) is contingent upon an accurate clinical assessment of the circadian phase. However, the process of determining this circadian phase can be costly and is not yet readily available in the clinical setting. The present study investigated whether more cost-effective and convenient estimates of the circadian phase, such as self-reported sleep timing, can be used to predict the circadian phase and guide the timing of light and/or melatonin treatment (i...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27544836/rest-activity-rhythm-disruption-in-progressive-supranuclear-palsy
#15
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
https://www.readbyqxmd.com/read/27312974/circadian-melatonin-and-temperature-taus-in-delayed-sleep-wake-phase-disorder-and-non-24-hour-sleep-wake-rhythm-disorder-patients-an-ultradian-constant-routine-study
#16
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
https://www.readbyqxmd.com/read/27305041/participation-of-the-olfactory-bulb-in-circadian-organization-during-early-postnatal-life-in-rabbits
#17
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
https://www.readbyqxmd.com/read/27085778/short-term-feeding-at-the-wrong-time-is-sufficient-to-desynchronize-peripheral-clocks-and-induce-obesity-with-hyperphagia-physical-inactivity-and-metabolic-disorders-in-mice
#18
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
https://www.readbyqxmd.com/read/27033803/disturbed-diurnal-rhythm-of-three-classical-phase-markers-in-the-chronic-mild-stress-rat-model-of-depression
#19
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
https://www.readbyqxmd.com/read/26985450/individually-tailored-light-intervention-through-closed-eyelids-to-promote-circadian-alignment-and-sleep-health
#20
Mariana G Figueiro
BACKGROUND: Light is most effective at changing the timing of the circadian clock when applied close to the core body temperature minimum. The present study investigated, in a home setting, if individually tailored light treatment using flashing blue light delivered through closed eyelids during the early part of the sleep period delayed circadian phase and sleep in a population of healthy older adults and in those suffering from early awakening insomnia. METHODS: Twenty-eight participants (9 early awakening insomniacs) completed an 8-week, within-subjects study...
March 1, 2015: Sleep Health
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