Age and Sleep Modify Finger Temperature Responses to Facial Cooling

1993 ◽  
Vol 48 (3) ◽  
pp. M108-M116 ◽  
Author(s):  
J. R. Jennings ◽  
C. F. Reynolds ◽  
P. R. Houck ◽  
D. J. Buysse ◽  
C. C. Hoch ◽  
...  
Keyword(s):  
Finger Temperature ◽  
Facial Cooling ◽  
Temperature Responses

Effect of chronic local cold exposure on finger temperature responses

1962 ◽  
Vol 17 (2) ◽  
pp. 317-322 ◽  
Author(s):  
Thomas Adams ◽  
R. Elphin Smith
Keyword(s):  
Cold Exposure ◽  
Temperate Climate ◽  
Peripheral Vascular ◽  
Temperature Level ◽  
Final Temperature ◽  
Finger Temperature ◽  
Subsequent Test ◽  
Data Parallel ◽  
Ice Water ◽  
Temperature Responses

Caucasian subjects from a temperate climate immersed their right index fingers in a stirred ice-water bath for 20 min four times daily for 1 month. During subsequent test immersion, fingers exposed in this way showed an earlier initiation and a more rapid rate of spontaneous rewarming and a higher and more labile final temperature level than did either the same finger before the prolonged cold exposure or other digits not chronically cold exposed. The inference derived from these data that blood flow is elevated in chronically cold-exposed fingers was supported by digital calorimetric determinations. Since finger temperature responses were modified only in the cold-conditioned digit, the term “local cold conditioning” appears justified. Variation of the number of daily exposures made clear a progressive modification of skin temperature responses to cold. During the month of repeated cold exposures, pain associated with this type of cold exposure diminished and finally disappeared. These experimental data parallel most observations on peripheral vascular responses to natural cold exposures and may suggest a mechanism for the changes under both conditions. Submitted on July 28, 1961

The effects of age on finger temperature responses to local cooling

1955 ◽  
Vol 50 (4) ◽  
pp. 551-555 ◽  
Author(s):  
G.B. Spurr ◽  
B.K. Hutt ◽  
Steven M. Horvath
Keyword(s):  
Local Cooling ◽  
Finger Temperature ◽  
Temperature Responses

scholarly journals FINGER TEMPERATURE RESPONSES TO LOCAL COOLING IN SEVERAL GROUPS OF SUBJECTS IN HOKKAIDO

1970 ◽  
Vol 20 (4) ◽  
pp. 370-380 ◽  
Author(s):  
Shinji ITOH ◽  
Akihiro KUROSHIMA ◽  
Tsutomu HIROSHIGE ◽  
Katsuhiko DOI
Keyword(s):  
Local Cooling ◽  
Finger Temperature ◽  
Temperature Responses

Evaluation of the temperature responses in colorimetric measurements of chemisorption enthalpies on metal films

1979 ◽  
Vol 44 (12) ◽  
pp. 3425-3433 ◽  
Author(s):  
Miloš Smutek ◽  
Slavoj Černý
Keyword(s):  
Heat Evolution ◽  
Adiabatic Temperature ◽  
Time Curve ◽  
Model Calculations ◽  
Colorimetric Measurements ◽  
Reliable Procedure ◽  
Temperature Responses ◽  
Temperature Time ◽  
Zero Time ◽  
Cooling Part

An analysis was performed of various estimates of the adiabatic temperature Ttot that corresponds to the total heat liberated by a gas dose adsorbed on a metal film in the calorimeter for measurement of chemisorption enthalpies. Besides the two common procedures consisting either in the construction of the adiabatic temperature-time curve or in the extrapolation of the single-exponential cooling part of the actual temperature-time curve to zero time, we have examined estimates of Ttot by extrapolating the cooling exponential to the mid-point between zero time and the temperature maximum (t = tmax/2). Model calculations have shown the merit of the latter extrapolation, particularly in the cases of slow heat evolution. This has been verified on the data measured in the chemisorption of methane and ethane on molybdenum films. Extrapolation to tmax/2 has turned out to be a simple and reasonably reliable procedure for handling the data obtained in film calorimeters.

Wave reflection augments central systolic and pulse pressures during facial cooling

2008 ◽  
Vol 294 (6) ◽  
pp. H2535-H2539 ◽  
Author(s):  
David G. Edwards ◽  
Matthew S. Roy ◽  
Raju Y. Prasad
Keyword(s):  
Cardiovascular Events ◽  
Wave Reflection ◽  
Augmentation Index ◽  
Systolic Pressure ◽  
Aortic Pressure ◽  
Applanation Tonometry ◽  
Pressure Waveform ◽  
Central Aortic Pressure ◽  
Facial Cooling ◽  
Change In Mean

Cardiovascular events are more common in the winter months, possibly because of hemodynamic alterations in response to cold exposure. The purpose of this study was to determine the effect of acute facial cooling on central aortic pressure, arterial stiffness, and wave reflection. Twelve healthy subjects (age 23 ± 3 yr; 6 men, 6 women) underwent supine measurements of carotid-femoral pulse wave velocity (PWV), brachial artery blood pressure, and central aortic pressure (via the synthesis of a central aortic pressure waveform by radial artery applanation tonometry and generalized transfer function) during a control trial (supine rest) and a facial cooling trial (0°C gel pack). Aortic augmentation index (AI), an index of wave reflection, was calculated from the aortic pressure waveform. Measurements were made at baseline, 2 min, and 7 min during each trial. Facial cooling increased ( P < 0.05) peripheral and central diastolic and systolic pressures. Central systolic pressure increased more than peripheral systolic pressure (22 ± 3 vs. 15 ± 2 mmHg; P < 0.05), resulting in decreased pulse pressure amplification ratio. Facial cooling resulted in a robust increase in AI and a modest increase in PWV (AI: −1.4 ± 3.8 vs. 21.2 ± 3.0 and 19.9 ± 3.6%; PWV: 5.6 ± 0.2 vs. 6.5 ± 0.3 and 6.2 ± 0.2 m/s; P < 0.05). Change in mean arterial pressure but not PWV predicted the change in AI, suggesting that facial cooling may increase AI independent of aortic PWV. Facial cooling and the resulting peripheral vasoconstriction are associated with an increase in wave reflection and augmentation of central systolic pressure, potentially explaining ischemia and cardiovascular events in the cold.

scholarly journals Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4010
Author(s):  
Monika Gwadera ◽  
Krzysztof Kupiec
Keyword(s):  
Temperature Field ◽  
Heat Exchanger ◽  
Surface Temperature ◽  
Ground Surface ◽  
Heat Sources ◽  
Ground Surface Temperature ◽  
Coil Heat Exchanger ◽  
The Relationship ◽  
Temperature Responses ◽  
Coil Heat

In order to find the temperature field in the ground with a heat exchanger, it is necessary to determine temperature responses of the ground caused by heat sources and the influence of the environment. To determine the latter, a new model of heat transfer in the ground under natural conditions was developed. The heat flux of the evaporation of moisture from the ground was described by the relationship taking into account the annual amount of rainfall. The analytical solution for the equations of this model is presented. Under the conditions for which the calculations were performed, the following data were obtained: the average ground surface temperature Tsm = 10.67 °C, the ground surface temperature amplitude As = 13.88 K, and the phase angle Ps = 0.202 rad. This method makes it possible to easily determine the undisturbed ground temperature at any depth and at any time. This solution was used to find the temperature field in the ground with an installed slinky-coil heat exchanger that consisted of 63 coils. The results of calculations according to the presented model were compared with the results of measurements from the literature. The 3D model for the ground with an installed heat exchanger enables the analysis of the influence of miscellaneous parameters of the process of extracting or supplying heat from/to the ground on its temperature field.

Temperature Responses of the Cactus Dodger, Cacama valvata (Homoptera, Cicadadae)

1972 ◽  
Vol 45 (3) ◽  
pp. 238-246 ◽  
Author(s):  
James Edward Heath ◽  
Peter Julian Wilkin ◽  
Maxine S. Heath
Keyword(s):  
Temperature Responses
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