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core body temperature circadian phase

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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
#1
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
https://www.readbyqxmd.com/read/27621470/diurnal-and-circadian-variation-of-sleep-and-alertness-in-men-vs-naturally-cycling-women
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/26965348/circadian-rhythms-and-sleep-regulation-in-seasonal-affective-disorder
#10
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
https://www.readbyqxmd.com/read/26842248/chronic-alcohol-consumption-in-rats-leads-to-desynchrony-in-diurnal-rhythms-and-molecular-clocks
#11
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
https://www.readbyqxmd.com/read/26840322/daily-rhythms-of-hunger-and-satiety-in-healthy-men-during-one-week-of-sleep-restriction-and-circadian-misalignment
#12
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
https://www.readbyqxmd.com/read/26563739/using-interstimulus-interval-to-maximise-sensitivity-of-the-psychomotor-vigilance-test-to-fatigue
#13
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
https://www.readbyqxmd.com/read/26534845/the-efficacy-of-objective-and-subjective-predictors-of-driving-performance-during-sleep-restriction-and-circadian-misalignment
#14
Anastasi Kosmadopoulos, Charli Sargent, Xuan Zhou, David Darwent, Raymond W Matthews, Drew Dawson, Gregory D Roach
Fatigue is a significant contributor to motor-vehicle accidents and fatalities. Shift workers are particularly susceptible to fatigue-related risks as they are often sleep-restricted and required to commute around the clock. Simple assays of performance could provide useful indications of risk in fatigue management, but their effectiveness may be influenced by changes in their sensitivity to sleep loss across the day. The aim of this study was to evaluate the sensitivity of several neurobehavioral and subjective tasks to sleep restriction (SR) at different circadian phases and their efficacy as predictors of performance during a simulated driving task...
October 31, 2015: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/26333783/morning-and-evening-physical-exercise-differentially-regulate-the-autonomic-nervous-system-during-nocturnal-sleep-in-humans
#15
Yujiro Yamanaka, Satoko Hashimoto, Nana N Takasu, Yusuke Tanahashi, Shin-Ya Nishide, Sato Honma, Ken-Ichi Honma
Effects of daily physical exercise in the morning or in the evening were examined on circadian rhythms in plasma melatonin and core body temperature of healthy young males who stayed in an experimental facility for 7 days under dim light conditions (<10 lux). Sleep polysomnogram (PSG) and heart rate variability (HRV) were also measured. Subjects performed 2-h intermittent physical exercise with a bicycle ergometer at ZT3 or at ZT10 for four consecutive days, where zeitgeber time 0 (ZT0) was the time of wake-up...
November 1, 2015: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/26086998/congenital-central-hypoventilation-syndrome-cchs-circadian-temperature-variation
#16
Rehan Saiyed, Casey M Rand, Michael S Carroll, Cynthia M Koliboski, Tracey M Stewart, Cindy D Brogadir, Anna S Kenny, Emily K E Petersen, David W Carley, Debra E Weese-Mayer
BACKGROUND: Congenital central hypoventilation syndrome (CCHS) is a rare neurocristopathy, which includes a control of breathing deficit and features of autonomic nervous system (ANS) dysregulation. In recognition of the fundamental role of the ANS in temperature regulation and rhythm and the lack of any prior characterization of circadian temperature rhythms in CCHS, we sought to explore peripheral and core temperatures and circadian patterning. We hypothesized that CCHS patients would exhibit lower peripheral skin temperatures (PST), variability, and circadian rhythmicity (vs...
March 2016: Pediatric Pulmonology
https://www.readbyqxmd.com/read/25900040/repeated-psychosocial-stress-at-night-affects-the-circadian-activity-rhythm-of-male-mice
#17
Manuela S Bartlang, Henrik Oster, Charlotte Helfrich-Förster
We have recently shown that molecular rhythms in the murine suprachiasmatic nucleus (SCN) are affected by repeated social defeat (SD) during the dark/active phase (social defeat dark [SDD]), while repeated SD during the light/inactive phase (social defeat light [SDL]) had no influence on PERIOD2::LUCIFERASE explant rhythms in the SCN. Here we assessed the effects of the same stress paradigm by in vivo biotelemetry on 2 output rhythms of the circadian clock (i.e., activity and core body temperature) in wild-type (WT) and clock-deficient Period (Per)1/2 double-mutant mice during and following repeated SDL and SDD...
June 2015: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/25798696/atypical-expression-of-circadian-clock-genes-in-denervated-mouse-skeletal-muscle
#18
Reiko Nakao, Saori Yamamoto, Kazumasa Horikawa, Yuki Yasumoto, Takeshi Nikawa, Chiaki Mukai, Katsutaka Oishi
The central circadian clock in the suprachiasmatic nucleus of the hypothalamus synchronizes peripheral clocks through neural and humoral signals in most mammalian tissues. Here, we analyzed the effects of unilateral sciatic denervation on the expression of circadian clock- and clock-controlled genes in the gastrocnemius muscles of mice twice per day on days 0, 3, 7, 9, 11 and 14 after denervation and six times on each of days 7 and 28 after denervation to assess the regulation mechanism of the circadian clock in skeletal muscle...
May 2015: Chronobiology International
https://www.readbyqxmd.com/read/25648622/thermoregulation-and-energetics-in-hibernating-black-bears-metabolic-rate-and-the-mystery-of-multi-day-body-temperature-cycles
#19
Øivind Tøien, John Blake, Brian M Barnes
Black bears overwintering in outdoor hibernacula in Alaska decrease metabolism to as low as 25 % basal rates, while core body temperature (T(b)) decreases from 37 to 38 °C to a mid-hibernation average of 33 °C. T b develops cycles of 1.6-7.3 days length within a 30-36 °C range, with no circadian component. We do not know the mechanism or function underlying behind the T(b) cycles, although bears avoid T(b) of <30 °C and shorter cycles are predicted from higher rates of heat loss in colder conditions...
May 2015: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/25615603/free-access-to-a-running-wheel-advances-the-phase-of-behavioral-and-physiological-circadian-rhythms-and-peripheral-molecular-clocks-in-mice
#20
Yuki Yasumoto, Reiko Nakao, Katsutaka Oishi
Behavioral and physiological circadian rhythms are controlled by endogenous oscillators in animals. Voluntary wheel-running in rodents is thought to be an appropriate model of aerobic exercise in humans. We evaluated the effects of chronic voluntary exercise on the circadian system by analyzing temporal profiles of feeding, core body temperature, plasma hormone concentrations and peripheral expression of clock and clock-controlled genes in mice housed under sedentary (SED) conditions or given free access to a running-wheel (RW) for four weeks...
2015: PloS One
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