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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/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
#4
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/27033803/disturbed-diurnal-rhythm-of-three-classical-phase-markers-in-the-chronic-mild-stress-rat-model-of-depression
#5
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/26915143/a-wearable-thermometry-for-core-body-temperature-measurement-and-its-experimental-verification
#6
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
https://www.readbyqxmd.com/read/26746321/-circadian-markers-and-genes-in-bipolar-disorder
#7
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
https://www.readbyqxmd.com/read/26662127/circadian-malfunctions-in-depression-neurobiological-and-psychosocial-approaches
#8
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
https://www.readbyqxmd.com/read/26563739/using-interstimulus-interval-to-maximise-sensitivity-of-the-psychomotor-vigilance-test-to-fatigue
#9
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
#10
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
#11
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/26246488/identification-of-scalp-eeg-circadian-variation-using-a-novel-correlation-sum-measure
#12
Ali Shahidi Zandi, Philippe Boudreau, Diane B Boivin, Guy A Dumont
OBJECTIVE: In this paper, we propose a novel method to determine the circadian variation of scalp electroencephalogram (EEG) in both individual and group levels using a correlation sum measure, quantifying self-similarity of the EEG relative energy across waking epochs. APPROACH: We analysed EEG recordings from central-parietal and occipito-parietal montages in nine healthy subjects undergoing a 72 h ultradian sleep-wake cycle protocol. Each waking epoch (∼ 1 s) of every nap opportunity was decomposed using the wavelet packet transform, and the relative energy for that epoch was calculated in the desired frequency band using the corresponding wavelet coefficients...
October 2015: Journal of Neural Engineering
https://www.readbyqxmd.com/read/26086998/congenital-central-hypoventilation-syndrome-cchs-circadian-temperature-variation
#13
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/25908646/melatonin-physiological-effects-in-humans
#14
REVIEW
B Claustrat, J Leston
Melatonin is a methoxyindole synthesized and secreted principally by the pineal gland at night under normal light/dark conditions. The endogenous rhythm of secretion is generated by the suprachiasmatic nuclei and entrained to the light/dark cycle. Light is able to either suppress or synchronize melatonin production according to the light schedule. The nycthohemeral rhythm of this hormone can be evaluated by repeated measurement of plasma or saliva melatonin or urine sulfatoxymelatonin, the main hepatic metabolite...
April 2015: Neuro-Chirurgie
https://www.readbyqxmd.com/read/25655795/temperature-oscillations-drive-cycles-in-the-activity-of-mmp-2-9-secreted-by-a-human-trabecular-meshwork-cell-line
#15
Stanley Ka-Lok Li, Juni Banerjee, Christopher Jang, Amita Sehgal, Richard A Stone, Mortimer M Civan
PURPOSE: Aqueous humor inflow falls 50% during sleeping hours without proportional fall in IOP, partly reflecting reduced outflow facility. The mechanisms underlying outflow facility cycling are unknown. One outflow facility regulator is matrix metalloproteinase (MMP) release from trabecular meshwork (TM) cells. Because anterior segment temperature must oscillate due to core temperature cycling and eyelid closure during sleep, we tested whether physiologically relevant temperature oscillations drive cycles in the activity of secreted MMP...
February 2015: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/25636902/estimating-resting-metabolic-rate-by-biologging-core-and-subcutaneous-temperature-in-a-mammal
#16
Benjamin Rey, Lewis G Halsey, Robyn S Hetem, Andrea Fuller, Duncan Mitchell, Jean-Louis Rouanet
Tri-axial accelerometry has been used to continuously and remotely assess field metabolic rates in free-living endotherms. However, in cold environments, the use of accelerometry may underestimate resting metabolic rate because cold-induced stimulation of metabolic rate causes no measurable acceleration. To overcome this problem, we investigated if logging the difference between core and subcutaneous temperatures (ΔTc-s) could reveal the metabolic costs associated with cold exposure. Using implanted temperature data loggers, we recorded core and subcutaneous temperatures continuously in eight captive rabbits (Oryctolagus cuniculus) and concurrently measured their resting metabolic rate by indirect calorimetry, at ambient temperatures ranging from -7 to +25°C...
May 2015: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/25414044/evidence-of-a-diurnal-thermogenic-handicap-in-obesity
#17
Daniela Grimaldi, Federica Provini, Giulia Pierangeli, Natalia Mazzella, Giovanni Zamboni, Giulio Marchesini, Pietro Cortelli
A thermogenic handicap has been proposed as potential contributor to weight gain in obese subjects but results from clinical studies are inconclusive. We tested whether diurnal and nocturnal body core temperature (BcT) measured for 20-h differed in nine obese subjects compared with 12 lean healthy controls when studied at rest under strictly controlled conditions. BcT was significantly reduced (∼0.35 °C) in obese subjects only during diurnal hours while during nocturnal hours BcT pattern was identical in the two groups...
March 2015: Chronobiology International
https://www.readbyqxmd.com/read/25285469/the-effects-of-evening-bright-light-exposure-on-subsequent-morning-exercise-performance
#18
A Thompson, H Jones, E Marqueze, W Gregson, G Atkinson
We investigated the effects of evening bright light on the circadian timing of core temperature and morning exercise performance under conditions of high thermal stress. At 20:00 h, 8 males were exposed to a standardised light protocol and thereafter to either polychromatic bright light (2,500 lux at 50 cm, BL) or no light (0 lux, NL) for 30 min. The following morning, intermittent cycling exercise was undertaken followed by a 10 km time-trial in an environmental chamber set to 35°C and 60% relative humidity...
February 2015: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/25277741/a-virtual-rat-for-simulating-environmental-and-exertional-heat-stress
#19
Vineet Rakesh, Jonathan D Stallings, Jaques Reifman
Severe cases of environmental or exertional heat stress can lead to varying degrees of organ dysfunction. To understand heat-injury progression and develop efficient management and mitigation strategies, it is critical to determine the thermal response in susceptible organs under different heat-stress conditions. To this end, we used our previously published virtual rat, which is capable of computing the spatiotemporal temperature distribution in the animal, and extended it to simulate various heat-stress scenarios, including 1) different environmental conditions, 2) exertional heat stress, 3) circadian rhythm effect on the thermal response, and 4) whole body cooling...
December 1, 2014: Journal of Applied Physiology
https://www.readbyqxmd.com/read/25245173/getting-rhythm-how-do-babies-do-it
#20
Desaline Joseph, Nelson W Chong, Morag E Shanks, Ezio Rosato, Nick A Taub, Stewart A Petersen, Michael E Symonds, William P Whitehouse, Michael Wailoo
OBJECTIVES: To investigate the emergence of biological rhythms in the first months of life in human infants, by measuring age-related changes in core body temperature during night-time sleep, hormones (cortisol and 6-sulfatoxymelatonin) and the expression of a clock-controlled gene H3f3b in oral epithelial cells. DESIGN: Observational longitudinal study. SETTING: We measured overnight core body temperature, actigraphy, day-night urinary cortisol and 6-sulfatoxymelatonin, as well as circadian gene expression, in infants at home from March 2007 to July 2008 in Leicester...
January 2015: Archives of Disease in Childhood. Fetal and Neonatal Edition
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