Control of shivering and heart rate in incubating bantam hens upon sudden exposure to cold eggs

1993 ◽  
Vol 149 (2) ◽  
pp. 205-214 ◽  
Author(s):  
Ø. TØIEN
Keyword(s):  
Heart Rate ◽  
Exposure To Cold

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.

Role of the Thyroid in Metabolic Response to Low Temperature

1956 ◽  
Vol 188 (1) ◽  
pp. 40-44 ◽  
Author(s):  
A. C. L. Hsieh ◽  
L. D. Carlson
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Low Temperature ◽  
Metabolic Response ◽  
Muscular Activity ◽  
Half Time ◽  
High Metabolic Rate ◽  
Cold Adapted ◽  
Exposure To Cold

Cold-adapted rats, kept at 5°C, and warm-adapted rats, kept at 28°C, were curarized and oxygen consumption; heart rate; muscular activity; rectal, foot and room temperatures recorded during a period at 30°C and during exposure to cold. The experiments were performed before and at varying intervals after thyroidectomy. Oxygen consumption measured at 30°C reached a minimum 8 days after thyroidectomy in the rats kept at 5°C and 12 days after thyroidectomy in the rats kept at 28°C. The half-time for the decline was twice as long for the rats kept at 28°C, indicating that thyroxin stores were being utilized twice as fast by the rats kept at 5°C. Upon exposure to cold the rats responded by an increase in oxygen consumption. Since the response persisted after thyroxin stores had been depleted it is concluded that the metabolic response to cold is not directly dependent upon the amount of circulating thyroxin. Rats kept at 5°C reduced their food intake and lost weight following thyroidectomy, but maintained a high metabolic rate. The significance of these findings are discussed.

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

Development of hypertension in rats during chronic exposure to cold

1989 ◽  
Vol 66 (2) ◽  
pp. 741-749 ◽  
Author(s):  
M. J. Fregly ◽  
D. C. Kikta ◽  
R. M. Threatte ◽  
J. L. Torres ◽  
C. C. Barney
Keyword(s):  
Heart Rate ◽  
Gradual Increase ◽  
Heart Weight ◽  
Acute Administration ◽  
Adrenergic Agonist ◽  
Pretreatment Level ◽  
Exposure To Cold ◽  
Blood Pressures ◽  
Beta Adrenergic Agonist ◽  
Alpha Adrenergic Agonist

Resting systolic, diastolic, and mean blood pressures (MBP), as well as heart rates, of unanesthetized, unrestrained, cold-acclimated (CA, 4 wk, 6 degrees C) rats were measured by direct arterial cannula and compared with those of controls maintained at 25 degrees C. Exposure to cold increased all these measurements significantly. Mean heart weight of CA rats was also increased significantly above that of controls. The responsiveness of MBP and heart rate to administration of the beta-adrenergic agonist, isoproterenol (3, 5, and 8 micrograms/kg ip), to unanesthetized, unrestrained, CA rats during exposure to air at 6 degrees C was similar to, and possibly less than, that of warm-acclimated (WA) rats measured at 25 degrees C. Acute administration of the alpha-adrenergic agonist, phenylephrine (100 micrograms/kg ip), to CA rats while in air at 6 degrees C induced less of a change in MBP from pretreatment level than was observed in WA rats. However, no differences were observed between groups when changes in heart rate from pretreatment level were compared. A similar statement may be made for a higher dose of phenylephrine (150 micrograms/kg ip), although MBP were elevated to higher levels in both groups with the higher dose. Abrupt exposure of WA rats to cold (6 degrees C) resulted in a sharp increase in heart rate and a more gradual increase in MBP over a period of 1 h. Removal of CA rats from 6 to 25 degrees C resulted in a gradual decrease in heart rate with no significant change in MBP during the ensuing hour.(ABSTRACT TRUNCATED AT 250 WORDS)

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