scholarly journals Heart Rate and Body Temperature Responses during and after Exposure to Cold

1982 ◽  
Vol 90 (4) ◽  
pp. 411-419 ◽  
Author(s):  
Yutaka TOCHIHARA ◽  
Tadakatsu OHNAKA ◽  
Shinya YAMAZAKI ◽  
Masatoshi TANAKA ◽  
Keiichi YOSHIDA
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Exposure To Cold ◽  
Temperature Responses

Effects of pentobarbital on temperature and heart rate of rats subjected to cold

1962 ◽  
Vol 203 (4) ◽  
pp. 758-761 ◽  
Author(s):  
C. L. Gemmill ◽  
K. M. Browning
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Standard Dose ◽  
The Body ◽  
Sodium Pentobarbital ◽  
Previous Exposure ◽  
Exposure To Cold ◽  
Before And After

A study at 5 C was made of body temperature and heart rate after a standard dose of sodium pentobarbital in normal, thyroidectomized, and hypermetabolic rats before and after subjection to 5 C for 46 hr. It was found that after subjection to cold in the normal rats, the body temperature and heart rate in some animals had more ability to recover after the barbiturate than in rats without previous exposure to cold. There was no ability to recover in the thyroidectomized animals either before or after subjection to cold. Most of the normal and thyroidectomized rats either with or without previous exposure to cold given sodium 3,3',5-l-triiodothyronine (T-3) had recoveries after the barbiturate. Some rats given T-3 and subjected to cold had a primary fall in temperature and heart rate that was followed by recovery and then a secondary fall.

Temperature regulation of rats with hypothalamic hyperphagia

1961 ◽  
Vol 200 (4) ◽  
pp. 703-706 ◽  
Author(s):  
Paul W. Han ◽  
John R. Brobeck
Keyword(s):  
Weight Gain ◽  
Body Temperature ◽  
Temperature Regulation ◽  
Exposure To Cold ◽  
Temperature Responses ◽  
Hypothalamic Hyperphagia

Temperature regulating mechanisms of rats with ventromedial lesions of the hypothalamus were studied by determining their body temperature responses to exercise, and to exposure to cold or heat. These lesions caused no primary impairment of temperature regulation. A higher body temperature observed after forced exercise was found to be secondary to the rats' hyperphagic behavior and their consequent weight gain.

scholarly journals Heart Rate and Body Temperature Responses to Extreme Heat and Humidity With and Without Electric Fans

JAMA ◽  
2015 ◽  
Vol 313 (7) ◽  
pp. 724 ◽  
Author(s):  
Nicholas M. Ravanelli ◽  
Simon G. Hodder ◽  
George Havenith ◽  
Ollie Jay
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Extreme Heat ◽  
Temperature Responses

Effects of adrenaline and noradrenaline on the heat production of warm- and cold-acclimated sheep

1981 ◽  
Vol 59 (9) ◽  
pp. 985-993 ◽  
Author(s):  
A. D. Graham ◽  
R. J. Christopherson
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Dose Rate ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Heat Production ◽  
Cold Exposure ◽  
Gas Analysis ◽  
Dose Rates ◽  
Temperature Responses

The heat production (HP), heart rate (HR), respiration rate, rumen motility, and body temperature responses to 2.5-h adrenaline (A) and noradrenaline (NA) intrajugular infusions at 0.00, 0.15, 0.30, 0.60, and 0.90 μg∙kg−1∙min−1 were studied in 10 shorn wethers which had been chronically (3–8 weeks) exposed to warm (19–24 °C) or moderately cold (8–13 °C) temperatures. Heat production, as estimated from respired gas analysis, increased 40–45% with all doses of A and the effect was potentiated by chronic cold exposure. Only the higher dose rates of NA induced an increase in HP. The maximum HP increase due to NA was 30% and the effect was not influenced by chronic cold exposure. Thermoneutral HP was greater by 16–19% in cold-acclimated as compared with warm-acclimated sheep. Corresponding to the HP effects of A and NA, all doses of A and the highest dose of NA resulted in slight increases in rectal temperature. Respiration rate increased with increased dose rate of NA but only the highest dose of A resulted in an increase in respiration rate. HR, rectal temperature, and respiration rate responses to A and NA were not influenced by cold acclimation.

scholarly journals Estimation of cardiovascular drift through ear temperature during prolonged steady-state cycling: a study protocol

2021 ◽  
Vol 7 (1) ◽  
pp. e000907
Author(s):  
Giovanni Polsinelli ◽  
Angelo Rodio ◽  
Bruno Federico
Keyword(s):  
Heart Rate ◽  
Steady State ◽  
Body Temperature ◽  
Study Protocol ◽  
External Auditory Canal ◽  
Exercise Intensity ◽  
Core Body Temperature ◽  
Cardiovascular Drift ◽  
Core Body ◽  
Steady State Cycling

IntroductionThe measurement of heart rate is commonly used to estimate exercise intensity. However, during endurance performance, the relationship between heart rate and oxygen consumption may be compromised by cardiovascular drift. This physiological phenomenon mainly consists of a time-dependent increase in heart rate and decrease in systolic volume and may lead to overestimate absolute exercise intensity in prediction models based on heart rate. Previous research has established that cardiovascular drift is correlated to the increase in core body temperature during prolonged exercise. Therefore, monitoring body temperature during exercise may allow to quantify the increase in heart rate attributable to cardiovascular drift and to improve the estimate of absolute exercise intensity. Monitoring core body temperature during exercise may be invasive or inappropriate, but the external auditory canal is an easily accessible alternative site for temperature measurement.Methods and analysisThis study aims to assess the degree of correlation between trends in heart rate and in ear temperature during 120 min of steady-state cycling with intensity of 59% of heart rate reserve in a thermally neutral indoor environment. Ear temperature will be monitored both at the external auditory canal level with a contact probe and at the tympanic level with a professional infrared thermometer.Ethics and disseminationThe study protocol was approved by an independent ethics committee. The results will be submitted for publication in academic journals and disseminated to stakeholders through summary documents and information meetings.

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