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Thermoregulation

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https://www.readbyqxmd.com/read/29147922/the-effect-of-head-to-head-competition-on-behavioural-thermoregulation-thermophysiological-strain-and-performance-during-exercise-in-the-heat
#1
Jo Corbett, Danny K White, Martin J Barwood, Christopher R D Wagstaff, Michael J Tipton, Terry McMorris, Joseph T Costello
BACKGROUND: It has been suggested that pacing is a thermoregulatory behaviour. We investigated the effect of competition on pacing, performance and thermophysiological strain during exercise in the heat and the psychological factors mediating competition effects. METHOD: Eighteen males (maximum oxygen uptake [V O 2max] 3.69 [0.44] L min(-1)) undertook a preliminary 20-km cool (wet-bulb globe temperature [WBGT] 12 °C) cycling time trial (TT) and three experimental 20-km trials (balanced order): (i) cool TT (CoolSolo); (ii) hot (WBGT 26 °C) TT (HotSolo); (iii) hot head-to-head competition (HotH2H)...
November 17, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29142185/anesthesia-procedure-for-congenital-insensitivity-to-pain-in-a-child-with-anhidrosis-syndrome-a-rare-case
#2
Aykut Urfalioglu, Mahmut Arslan, Yakup Duman, Gökce Gisi, Gözen Oksuz, Hüseyin Yildiz, Hafize Oksuz, Ayşe Balaban
Congenital insensitivity to pain with anhidrosis (CIPA) syndrome is a neuropathy characterized by insensitivity to pain, impaired thermoregulation, anhidrosis, and mental retardation. A 9-year old boy with CIPA syndrome, underwent 2 operations for a calcaneal ulcer. During the first operation standard monitorization was performed. In the second operation, Bispectral Index (BIS) monitoring was added and temperature was monitored with an esophageal probe. In the first operation, in which anesthesia induction was applied with ketamine and midazolam, extremity movements with surgical stimuli were seen...
2017: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
https://www.readbyqxmd.com/read/29142044/thermoregulatory-role-of-insensible-evaporative-water-loss-constancy-in-a-heterothermic-marsupial
#3
Christine Elizabeth Cooper, Philip Carew Withers
'Insensible' evaporative water loss of mammals has been traditionally viewed as a passive process, but recent studies suggest that insensible water loss is under regulatory control, although the physiological role of this control is unclear. We test the hypothesis that regulation of insensible water loss has a thermoregulatory function by quantifying for the first time evaporative water loss control, along with metabolic rate and body temperature, of a heterothermic mammal during normothermia and torpor. Evaporative water loss was independent of ambient relative humidity at ambient temperatures of 20 and 30°C, but not at 25°C or during torpor at 20°C...
November 2017: Biology Letters
https://www.readbyqxmd.com/read/29138741/challenges-to-global-implementation-of-infrared-thermography-technology-current-perspective
#4
Michael Shterenshis
Medical infrared thermography (IT) produces an image of the infrared waves emitted by the human body as part of the thermoregulation process that can vary in intensity based on the health of the person. This review analyzes recent developments in the use of infrared thermography as a screening and diagnostic tool in clinical and nonclinical settings, and identifies possible future routes for improvement of the method. Currently, infrared thermography is not considered to be a fully reliable diagnostic method...
2017: Central Asian Journal of Global Health
https://www.readbyqxmd.com/read/29138228/low-protein-diet-induced-hyperphagia-and-adiposity-are-modulated-through-interactions-involving-thermoregulation-motor-activity-and-protein-quality-in-mice
#5
Anne Blais, Catherine Chaumontet, Dalila Azzout-Marniche, Julien Piedcoq, Gilles Fromentin, Claire Gaudichon, Daniel Tomé, Patrick C Even
Low-protein (LP) containing diets can induce overeating in rodents and possibly in humans in an effort to meet protein requirement but the consequences on energy expenditure (EE) are unclear. The present study evaluated the changes induced by reducing dietary protein from 20% to 6%, using either soy protein or casein, on energy intake, body composition and EE in mice housed at 22°C or at 30°C (thermal-neutrality). LP feeding increased energy intake and adiposity, more in soy fed than in casein fed mice, but also increased EE thus limiting fat accumulation...
November 14, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29133226/the-effect-of-dietary-neonicotinoid-pesticides-on-non-flight-thermogenesis-in-worker-bumble-bees-bombus-terrestris
#6
Robert Potts, Rebecca M Clarke, Sophie E Oldfield, Lisa K Wood, Natalie Hempel de Ibarra, James E Cresswell
For bumble bees (genus Bombus), the capacity for non-flight thermogenesis is essential for two fundamental processes undertaken by adult workers, namely recovery from torpor after chilling and brood incubation. Farmland bees can be widely exposed to dietary residues of neurotoxic neonicotinoid insecticides that appear in the nectar and pollen of treated bee-attractive crops, which may harm them. An earlier study shows that dietary neonicotinoids cause complex alterations to thermoregulation in honey bees, but their effects on the thermogenic capabilities of individual bumble bees has been untested previously...
November 10, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/29130885/animal-thermoregulation-a-review-of-insulation-physiology-and-behaviour-relevant-to-temperature-control-in-buildings
#7
Dominic McCafferty, Guillaume Pandraud, Jérôme Gilles, Maria Fabra-Puchol, Pierre-Yves Henry
Birds and mammals have evolved many thermal adaptations that are relevant for bioinspired design of temperature control systems and energy management in buildings. Similar to many buildings, endothermic animals generate internal metabolic heat, are well insulated, regulate their temperature within set limits, modify microclimate and adjust thermal exchange with their environment. Here, we review the major components of animal thermoregulation in endothermic birds and mammals that are pertinent for building engineering, in a world where climate is changing and reduction in energy use is needed...
November 13, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29128926/helminth-infections-in-a-pair-of-sympatric-congeneric-lizard-species
#8
Thiago Maia-Carneiro, Tatiana Motta-Tavares, Robson Waldemar Ávila, Carlos F D Rocha
We analyzed parameters of parasitism by helminths in a pair of sympatric congeneric lizard species (Tropidurus hispidus and Tropidurus semitaeniatus). Differences in their supracommunities (richness, composition, and abundance) and the influence of helminthic loads on minimum flight initiation distances and body temperatures were evaluated. We reported new findings of Piratuba digiticauda infecting T. hispidus and Oochoristica bresslaui infecting T. semitaeniatus. Parapharyngodon alvarengai was the most abundant helminth in both host species...
November 11, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29119875/effects-of-positive-end-expiratory-pressure-on-intraoperative-core-temperature-in-patients-undergoing-posterior-spine-surgery-prospective-randomised-trial
#9
Hyungseok Seo, Je Do Son, Hyung-Chul Lee, Hyung-Min Oh, Chul-Woo Jung, Hee-Pyoung Park
Objective Positive end-expiratory pressure (PEEP) causes carotid baroreceptor unloading, which leads to thermoregulatory peripheral vasoconstriction. However, the effects of PEEP on intraoperative thermoregulation in the prone position remain unknown. Methods Thirty-seven patients undergoing spine surgery in the prone position were assigned at random to receive either 10 cmH2O PEEP (Group P) or no PEEP (Group Z). The primary endpoint was core temperature 180 minutes after intubation. Secondary endpoints were delta core temperature (difference in core temperature between 180 minutes and immediately after tracheal intubation), incidence of intraoperative hypothermia (core temperature of <36°C), and peripheral vasoconstriction-related data...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/29118845/association-between-intravascular-thermoregulation-devices-and-the-development-of-venous-thrombo-embolic-phenomenon
#10
Sophie Winder-Rhodes, Rosamund Lotay, James Doyle
No abstract text is available yet for this article.
August 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/29118023/the-orchestration-of-autonomous-and-behavioral-thermoregulation
#11
Boris R M Kingma
There seems to be an efficient order in the recruitment of thermo-effectors, which allows for body temperature regulation at minimal cost of nutrients and water. But how does thermal behaviour fit in this order? In this edition Schlader et al. hypothesized that thermal behavior fits in the orderly recruitment of thermo-effectors as follows: 1) vasomotor responses, 2) behavioral responses, and 3) sweating or metabolic responses. Their results support this hypothesis by showing consistently for heating and cooling that non-glabrous skin blood flow changes immediately with changes in skin temperature, followed by the initiation of a behavioral response...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29113989/cold-hearted-bats-uncoupling-of-heart-rate-and-metabolism-during-torpor-at-subzero-temperatures
#12
Shannon E Currie, Clare Stawski, Fritz Geiser
Many hibernating animals thermoregulate during torpor and defend their body temperature (Tb) below 10°C by an increase in metabolic rate. Above a critical temperature (Tcrit) animals usually thermoconform. We investigated the physiological responses above and below Tcrit for a small tree dwelling bat (Chalinolobus gouldii, ∼14 g) that is often exposed to subzero temperatures during winter. Through simultaneous measurement of heart rate (HR) and oxygen consumption (V̇O2) we show that the relationship between oxygen transport and cardiac function is substantially altered in thermoregulating torpid bats between 1 and -2°C, compared with thermoconforming torpid bats at mild ambient temperatures (Ta 5-20°C)...
November 7, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29112964/environment-dependence-of-behavioural-consistency-in-adult-male-european-green-lizards-lacerta-viridis
#13
Gergely Horváth, Boglárka Mészáros, Tamás János Urszán, Katalin Bajer, Orsolya Molnár, László Zsolt Garamszegi, Gábor Herczeg
Understanding the background mechanisms affecting the emergence and maintenance of consistent between-individual variation within population in single (animal personality) or across multiple (behavioural syndrome) behaviours has key importance. State-dependence theory suggests that behaviour is 'anchored' to individual state (e.g. body condition, gender, age) and behavioural consistency emerges through behavioural-state feedbacks. A number of relevant state variables are labile (e.g. body condition, physiological performance) and expected to be affected by short-term environmental change...
2017: PloS One
https://www.readbyqxmd.com/read/29109627/temperature-management-under-general-anesthesia-compulsion-or-option
#14
REVIEW
Barkha Bindu, Ashish Bindra, Girija Rath
Administration of general anesthesia requires continuous monitoring of vital parameters of the body including body temperature. However, temperature continues to be one of the least seriously monitored parameters perioperatively. Inadvertent perioperative hypothermia is a relatively common occurrence with both general and regional anesthesia and can have significant adverse impact on patients' outcome. While guidelines for perioperative temperature management have been proposed, there are no specific guidelines regarding the best site or best modality of temperature monitoring and management intraoperatively...
July 2017: Journal of Anaesthesiology, Clinical Pharmacology
https://www.readbyqxmd.com/read/29108562/support-for-the-thermal-coadaptation-hypothesis-from-the-growth-rates-of-sceloporus-jarrovii-lizards
#15
L D Patterson, C-A Darveau, G Blouin-Demers
The thermal coadaptation hypothesis posits that ectotherms thermoregulate behaviorally to maintain body temperatures (Tb) that maximize performance, such as net energy gain. Huey's (1982) energetics model describes how food availability and Tb interact to affect net energy gain. We tested the thermal coadaptation hypothesis and Huey's energetics model with growth rates of juvenile Yarrow's spiny lizards (Sceloporus jarrovii). We compared the preferred (selected) Tb range (Tsel) of lizards in high and low energy states to their optimal temperature (To) for growth over nine weeks, and determined whether the To for growth depended on food availability...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29108558/partitioning-thermal-habitat-on-a-vertical-rock-a-herculean-task
#16
Panayiotis Pafilis, Panayiota Maragou, Kostas Sagonas, Efstratios Valakos
Species occurring in sympatry have to effectively segregate their niche in order to co-exist. In the case of ectotherms in particular, the very important parameter of thermal biology has to be taken into account. Here we investigated the thermoregulatory effectiveness (E) of two endemic Greek lizards (Hellenolacerta graeca and Podarcis peloponnesiacus) that live syntopically on a rocky cliff in the Peloponnese. We presumed that the two species would select different microhabitats, to avoid interspecific competition, and follow a similar thermoregulation pattern as they experience the same conditions...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29108557/seasonal-energetics-and-torpor-use-in-north-american-flying-squirrels
#17
Megan N Olson, Jeff Bowman, Gary Burness
Seasonal cold temperatures require mammals to use morphological, behavioural, or physiological traits to survive periods of extreme cold and food shortage. Torpor is a physiological state that minimizes energy requirements by decreasing resting metabolic rate (MR) and body temperature (Tb). Many rodent species are capable of torpor, however, evidence in northern and southern flying squirrels (Glaucomys sabrinus and Glaucomys volans, respectively) has remained anecdotal. We experimentally attempted to induce torpor in wild-caught flying squirrels by lowering ambient temperature (Ta) and measuring MR using open-flow respirometry...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29103320/cross-sectional-area-of-the-murine-aorta-linearly-increases-with-increasing-core-body-temperature
#18
A Colleen Crouch, Adam B Manders, Amos A Cao, Ulrich M Scheven, Joan M Greve
PURPOSE: The cardiovascular (CV) system plays a vital role in thermoregulation. To date, the response of core vasculature to increasing core temperature has not been adequately studied in vivo. Our objective was to non-invasively quantify the arterial response in murine models due to increases in body temperature, with a focus on core vessels of the torso and investigate whether responses were dependent on sex or age. METHODS: Male and female, adult and aged mice were anaesthetised and underwent magnetic resonance imaging (MRI)...
November 6, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29099251/effect-of-brachycephaly-and-body-condition-score-on-respiratory-thermoregulation-of-healthy-dogs
#19
Michael S Davis, Sabrina L Cummings, Mark E Payton
OBJECTIVE To evaluate the effect of brachycephaly and body condition score on respiratory thermoregulation of healthy dogs. DESIGN Prospective study. ANIMALS 52 brachycephalic and 53 nonbrachycephalic dogs. PROCEDURES All dogs were exposed to a cool treatment (temperature, 21.8 ± 1.7°C [71.2 ± 3.1°F]; relative humidity, 62.2 ± 9.7%; and ambient enthalpy, 47.7 ± 6.6 kcal/kg) and then a hot treatment (temperature, 32.9 ± 1.7°C [91.2 ± 3.1°F]; relative humidity, 51.9 ± 9.8%; and ambient enthalpy, 74...
November 15, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29095375/negative-temperature-differential-in-preterm-infants-less-than-29-weeks-gestational-age-associations-with-infection-and-maternal-smoking
#20
Robin B Knobel-Dail, Richard Sloane, Diane Holditch-Davis, David T Tanaka
BACKGROUND: Hypothermia is related to increased morbidity and mortality in very preterm infants; continuous temperature monitoring is necessary. Thermoregulation is limited in preterm infants. OBJECTIVES: The purpose of the research was to assess and describe negative temperature differential (NTD) and assess the associations of NTD with infant demographic characteristics, medical history, and clinical events. METHODS: An exploratory, case study design was used...
November 2017: Nursing Research
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