Stress-induced changes in body temperature of silver-haired bats (Lasionycteris noctivagans)

2018 ◽  
Vol 194 ◽  
pp. 356-361 ◽  
Author(s):  
Kristina A. Muise ◽  
Allyson K. Menzies ◽  
Craig K.R. Willis
Keyword(s):  
Body Temperature ◽  
Induced Changes ◽  
Lasionycteris Noctivagans

Hypoxia-induced changes in shivering and body temperature

1987 ◽  
Vol 62 (6) ◽  
pp. 2477-2484 ◽  
Author(s):  
H. Gautier ◽  
M. Bonora ◽  
S. A. Schultz ◽  
J. E. Remmers
Keyword(s):  
Central Nervous System ◽  
Body Temperature ◽  
Room Temperature ◽  
Co2 Concentration ◽  
Hypoxic Conditions ◽  
O2 Concentration ◽  
The Central Nervous System ◽  
Induced Changes ◽  
Maintain Body Temperature ◽  
Ambient Hypoxia

Experiments were carried out on conscious cats to evaluate the general characteristics and modes of action of hypoxia on thermoregulation during cold stress. Intact and carotid-denervated (CD) conscious cats were exposed to ambient hypoxia (low inspired O2 fraction) or CO hypoxia in prevailing laboratory (23–25 degrees C) or cold (5–8 degrees C) environments. In the cold, both groups promptly decreased shivering and body temperature when exposed to either type of hypoxia. Small increases in CO2 concentration reinstituted shivering in both groups. At the same inspired concentration of O2, CD animals decreased shivering and body temperature more than intact cats. While this difference resulted, in part, from a lower alveolar PO2 in CD cats, a difference between intact and CD cats was apparent when the two groups were compared at the same alveolar PO2. During more prolonged hypoxia (45 min), shivering returned but did not reach normoxic levels, and body temperature tended to stabilize at a hypothermic value. Exposure to various levels of hypoxia produced graded suppression of shivering, with the result that the change in body temperature varied directly with inspired O2 concentration. Hypoxia appears to act on the central nervous system to suppress shivering and sinus nerve afferents appear to counteract this direct effect of hypoxia. In intact cats, this counteraction appears to be sufficient to maintain body temperature under hypoxic conditions at room temperature but not in the cold.

scholarly journals Temperature-Induced Changes in Reperfused Stroke: Inflammatory and Thrombolytic Biomarkers

2020 ◽  
Vol 9 (7) ◽  
pp. 2108
Author(s):  
Paulo Ávila-Gómez ◽  
Pablo Hervella ◽  
Andrés Da Silva-Candal ◽  
María Pérez-Mato ◽  
Manuel Rodríguez-Yáñez ◽  
...  
Keyword(s):  
Body Temperature ◽  
Clot Lysis ◽  
Necrosis Factor Alpha ◽  
Poor Outcome ◽  
Tnf Α ◽  
Influence Of Temperature On ◽  
Factor Alpha ◽  
Higher Temperature ◽  
Poor Outcomes ◽  
Induced Changes

Although hyperthermia is associated with poor outcomes in ischaemic stroke (IS), some studies indicate that high body temperature may benefit reperfusion therapies. We assessed the association of temperature with effective reperfusion (defined as a reduction of ≥8 points in the National Institute of Health Stroke Scale (NIHSS) within the first 24 h) and poor outcome (modified Rankin Scale (mRS) > 2) in 875 retrospectively-included IS patients. We also studied the influence of temperature on thrombolytic (cellular fibronectin (cFn); matrix metalloproteinase 9 (MMP-9)) and inflammatory biomarkers (tumour necrosis factor-alpha (TNF-α), interleukin 6 (IL-6)) and their relationship with effective reperfusion. Our results showed that a higher temperature at 24 but not 6 h after stroke was associated with failed reperfusion (OR: 0.373, p = 0.001), poor outcome (OR: 2.190, p = 0.005) and higher IL-6 levels (OR: 0.958, p < 0.0001). Temperature at 6 h was associated with higher MMP-9 levels (R = 0.697; p < 0.0001) and effective reperfusion, although this last association disappeared after adjusting for confounding factors (OR: 1.178, p = 0.166). Our results suggest that body temperature > 37.5 °C at 24 h, but not at 6 h after stroke, is correlated with reperfusion failure, poor clinical outcome, and infarct size. Mild hyperthermia (36.5–37.5 °C) in the first 6 h window might benefit drug reperfusion therapies by promoting clot lysis.

Ambient temperature modulates hypoxic-induced changes in rat body temperature and activity differentially

2001 ◽  
Vol 280 (4) ◽  
pp. R1190-R1196 ◽  
Author(s):  
B. Bishop ◽  
G. Silva ◽  
J. Krasney ◽  
H. Nakano ◽  
A. Roberts ◽  
...  
Keyword(s):  
Body Temperature ◽  
Ambient Temperature ◽  
Induced Responses ◽  
Brain Pathology ◽  
Level Of Activity ◽  
Time Courses ◽  
Induced Changes ◽  
Subsequent Rise ◽  
The Brain

When rats, acclimated to an ambient temperature (Ta) of 29°C, are exposed to 10% O2 for 63 h, the circadian rhythms of body temperature (Tb) and level of activity (La) are abolished, Tb falls to a hypothermic nadir followed by a climb to a hyperthermic peak, Laremains depressed (Bishop B, Silva G, Krasney J, Salloum A, Roberts A, Nakano H, Shucard D, Rifkin D, and Farkas G. Am J Physiol Regulatory Integrative Comp Physiol 279: R1378–R1389, 2000), and overt brain pathology is detected (Krasney JA, Farkas G, Shucard DW, Salloum AC, Silva G, Roberts A, Rifkin D, Bishop B, and Rubio A. Soc Neurosci Abstr 25: 581, 1999). To determine the role of Ta in these hypoxic-induced responses, Tb and La data were detected by telemetry every 15 min for 48 h on air, followed by 63 h on 10% O2 from rats acclimated to 25 or 21°C. Magnitudes and rates of decline in Tb after onset of hypoxia were inversely proportional to Ta, whereas magnitudes and rates of Tb climb after the hypothermic nadir were directly proportional to Ta. No hyperthermia, so prominent at 29°C, occurred at 25 or 21°C. The hypoxic depression of La was least at 21°C and persisted throughout the hypoxia. In contrast, Ta was a strong determinant of the magnitudes and time courses of the initial fall and subsequent rise in Tb. We propose that the absence of hyperthermia at 21 and 25°C as well as a persisting hypothermia may protect the brain from overt pathology.

Pavlovian conditioning of drug-induced changes in body temperature

1983 ◽  
Vol 23 (3) ◽  
pp. 365-391 ◽  
Author(s):  
Christopher L. Cunningham ◽  
John C. Crabbe ◽  
Henk Rigter
Keyword(s):  
Body Temperature ◽  
Pavlovian Conditioning ◽  
Drug Induced ◽  
Induced Changes

Role of catecholamines in thyroxine-induced changes in metabolism and body temperature during exercise in dogs

1976 ◽  
Vol 32 (1) ◽  
pp. 68-69 ◽  
Author(s):  
Hanna Kaciuba-Uściłko ◽  
Zofia Brzezińska ◽  
J. E. Greenleaf
Keyword(s):  
Body Temperature ◽  
Induced Changes

Stress-Induced Changes in Circadian Rhythms of Body Temperature and Activity in Rats Are not Caused by Pacemaker Changes

1997 ◽  
Vol 12 (1) ◽  
pp. 80-92 ◽  
Author(s):  
P. Meerlo ◽  
R.H. van den Hoofdakker ◽  
J.M. Koolhaas ◽  
S. Daan
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Induced Changes
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