scholarly journals Core body temperature does not cool down with skin surface temperature during recovery at room temperature after acute heat stress exposure

2016 ◽  
Vol 191 ◽  
pp. 143-147 ◽  
Author(s):  
A. Sapkota ◽  
A. Herr ◽  
J.S. Johnson ◽  
D.C. Lay
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Surface Temperature ◽  
Room Temperature ◽  
Core Body Temperature ◽  
Skin Surface ◽  
Skin Surface Temperature ◽  
Stress Exposure ◽  
Acute Heat Stress ◽  
Core Body

Circadian rhythms in bed rest: Monitoring core body temperature via heat-flux approach is superior to skin surface temperature

2016 ◽  
Vol 34 (5) ◽  
pp. 666-676 ◽  
Author(s):  
Stefan Mendt ◽  
Martina Anna Maggioni ◽  
Michael Nordine ◽  
Mathias Steinach ◽  
Oliver Opatz ◽  
...  
Keyword(s):  
Heat Flux ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Surface Temperature ◽  
Core Body Temperature ◽  
Bed Rest ◽  
Skin Surface ◽  
Skin Surface Temperature ◽  
Core Body

scholarly journals Magnitude and associated factors of Perioperative hypothermia in patients who underwent Elective surgery at Tikur Anbessa Specialized Hospital, Addis Ababa, Ethiopia.

2019 ◽  
Vol 6 (2) ◽  
pp. 4332-4336 ◽  
Author(s):  
Mulualem S. Fekede ◽  
Wosenyeleh A. Sahile
Keyword(s):  
Body Temperature ◽  
Room Temperature ◽  
Elective Surgery ◽  
Addis Ababa ◽  
Core Body Temperature ◽  
P Value ◽  
Healthy Human ◽  
Cross Sectional ◽  
Perioperative Hypothermia ◽  
Core Body

Background : Body temperature is a vital sign and 37°C is the mean core body temperature of a healthy human. Core body temperature is normally tightly regulated and maintained within narrow range. Perioperative hypothermia is one of the major problems during surgery and anesthesia that can affect operated patients. Methods: Institutional based cross-sectional study was conducted. Patient interview, chart review and temperature measurement were employed for data collection. Temperature was measured using tympanic membrane thermometer. SPSS version 20 software was used for analysis. binary logistic regression was used to look at associations anda p-value of <0.05 was considered statistically significant. Result :The overall magnitude of preoperative, intra and post-operative hypothermia in this study was 16.2%, 53.2% and 31.3%, respectively. Age (AOR=7.15, 95% CI, 1.16, 43.99), coexisting illness (AOR, 3.32, 95% CI, 1.06; 10.36), preoperative hypothermia (AOR; 57; 95% CI; 7.1, 455.4), operation room temperature (AOR=1.91; 95 % CI, 1.04; 3.5) and crystalloid fluids administered (AOR; 2.3; 95% CI, 1.07, 4.9) were found to be factors associated with intraoperative hypothermia. Conclusion and recommendation: The magnitude of perioperative hypothermia remains high. Measures should focus on improving room temperature and warming up fluids. Susceptible patients like the aged and those with coexisting disease should be given extra attention.  

Infrared thermal imaging as a method to study thermogenesis in the neonatal lamb

2014 ◽  
Vol 54 (9) ◽  
pp. 1497 ◽  
Author(s):  
S. A. McCoard ◽  
H. V. Henderson ◽  
F. W. Knol ◽  
S. K. Dowling ◽  
J. R. Webster
Keyword(s):  
Body Temperature ◽  
Heat Loss ◽  
Cold Exposure ◽  
Thermal Imaging ◽  
Core Body Temperature ◽  
Recovery Period ◽  
Exposure Period ◽  
Skin Surface ◽  
Infrared Thermal Imaging ◽  
Core Body

The combination of heat generation and reducing heat loss from the skin surface is important for maintaining core body temperature in a neonate. Thermogenesis studies traditionally focus on measurement of core body temperature but not the contribution of radiated heat loss at the skin surface. This study aimed to evaluate the utility of using thermal imaging to measure radiated heat loss in newborn lambs. Continuous thermal images of newborn lambs were captured for 30 min each during the baseline (11−18°C), cold-exposure (0°C) and recovery (11−18°C) periods by using an infrared camera. Core body temperature measured by rectal thermometer was also recorded at the end of each period. In all, 7 of the 10 lambs evaluated had reduced rectal temperatures (0.4−1°C) between the baseline and recovery periods, while three maintained body temperature despite cold exposure. During the baseline period, infrared heat loss was relatively stable, followed by a rapid decrease of 5°C within 5 min of cold exposure. Heat loss continued to decrease linearly in the cold-exposure period by a further 10°C, but increased rapidly to baseline levels during the recovery period. A temperature change of between 20°C and 35°C was observed during the study, which was likely to be due to changes in vasoconstriction in the skin to conserve heat. The present study has highlighted the sensitivity of infrared thermal imaging to estimate heat loss from the skin in the newborn lamb and shown that rapid changes in heat loss occur in response to cold exposure.

scholarly journals Genetic parameters for hair characteristics and core body temperature in a multibreed Brahman–Angus herd1

2019 ◽  
Vol 97 (8) ◽  
pp. 3246-3252 ◽  
Author(s):  
Kaitlyn M Sarlo Davila ◽  
Heather Hamblen ◽  
Peter J Hansen ◽  
Serdal Dikmen ◽  
Pascal A Oltenacu ◽  
...  
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Genetic Parameters ◽  
Core Body Temperature ◽  
Cattle Breed ◽  
Measuring Device ◽  
Hair Samples ◽  
Diameter Core ◽  
Humidity Index ◽  
Core Body

Abstract Thermal stress in hot humid conditions limits cattle production. The objectives for this study were to estimate genetic parameters for hair characteristics and core body temperature under low and high temperature humidity index (THI) conditions. Hair samples were collected and measured for length and diameter. Core body temperature was measured as vaginal temperature every 15 min over a 5-d period using an iButton temperature measuring device implanted in a blank CIDR in 336 heifers from the University of Florida multibreed herd (ranging from 100% Angus to 100% Brahman). Restricted maximum likelihood procedures were used to estimate heritabilities from multiple bivariate animal models using the WOMBAT program. Estimates of heritability for hair diameter, undercoat length, topcoat length, body temperature under low THI conditions, and body temperature under high THI conditions were 0.50, 0.67, 0.42, 0.32, and 0.26, respectively. The genetic parameters estimated in this study indicate a large, exploitable genetic variance which can be selected upon to improve tolerance in cattle. Breed effects for differing compositions of Brahman and Angus were also estimated. As Brahman breed composition increased by 25% undercoat length, topcoat length, body temperature under low THI conditions, and body temperature under high THI conditions decreased by 1.32 mm, 2.94 mm, 0.11 °C, and 0.14 °C, respectively. Under both low and high THI conditions, cattle with 25% Brahman breed composition or greater maintained a significantly lower body temperature than the 100% Angus breed group. The incorporation of Brahman germplasm is recommended for herds that often experience heat stress conditions in order to increase resilience to heat stress.

The effects of heat stress on cognition in persons with multiple sclerosis

2011 ◽  
Vol 18 (4) ◽  
pp. 489-497 ◽  
Author(s):  
P Hämäläinen ◽  
A Ikonen ◽  
A Romberg ◽  
H Helenius ◽  
J Ruutiainen
Keyword(s):  
Multiple Sclerosis ◽  
Heat Stress ◽  
Body Temperature ◽  
Cognitive Functioning ◽  
Cognitive Deficits ◽  
Core Body Temperature ◽  
Heat Exposure ◽  
Heat Sensitivity ◽  
Serial Addition ◽  
Core Body

Background: Heat sensitivity and cognitive deficits are typical manifestations of multiple sclerosis (MS). Although cognitive deficits are quite well characterized, practically no data exist on the effects of heat on cognitive performances in MS. Objective: To assess the effects of short-term heat stress on cognitive functioning in subjects with MS. Methods: A total of 23 heat-sensitive MS and 19 healthy control (HC) subjects participated. Moderate heat exposure took place in a Finnish sauna. Cognitive functioning was measured with tests of sustained attention and processing speed, the Paced Auditory Serial Addition Test (PASAT 3” and 2”) and the computerized visual vigilance test, before, during and after heat exposure. Results: During the heat exposure, the core body temperature of the MS group rose significantly more ( p = 0.002) than that of the HC group. The heat stress worsened the performance of the MS group in the PASAT 3” ( p = 0.025) but not in the other cognitive measures. The performance in the PASAT 3” was reversed almost to the baseline level only 1- h after the heat exposure. Conclusions: A significant increase in core body temperature during heat stress is associated with a mild and reversible worsening of the PASAT 3” performance, while visual vigilance performance seems to remain almost unaffected.

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