Partitional Calorimetry in the Desert

1972 ◽  
pp. 23-51 ◽  
Author(s):  
A. PHARO GAGGE
Keyword(s):  
Partitional Calorimetry

scholarly journals Partitional calorimetry

2019 ◽  
Vol 126 (2) ◽  
pp. 267-277 ◽  
Author(s):  
Matthew N. Cramer ◽  
Ollie Jay
Keyword(s):  
Heat Balance ◽  
Estimation Error ◽  
Fluid Replacement ◽  
Whole Body ◽  
Exposure Limits ◽  
Experimental Conditions ◽  
Direct Calorimetry ◽  
Fundamental Properties ◽  
Wide Range ◽  
Partitional Calorimetry

For thermal physiologists, calorimetry is an important methodological tool to assess human heat balance during heat or cold exposures. A whole body direct calorimeter remains the gold standard instrument for assessing human heat balance; however, this equipment is rarely available to most researchers. A more widely accessible substitute is partitional calorimetry, a method by which all components of the conceptual heat balance equation—metabolic heat production, conduction, radiation, convection, and evaporation—are calculated separately based on fundamental properties of energy exchange. Since partitional calorimetry requires relatively inexpensive equipment (vs. direct calorimetry) and can be used over a wider range of experimental conditions (i.e., different physical activities, laboratory or field settings, clothed or seminude), it allows investigators to address a wide range of problems such as predicting human responses to thermal stress, developing climatic exposure limits and fluid replacement guidelines, estimating clothing properties, evaluating cooling/warming interventions, and identifying potential thermoregulatory dysfunction in unique populations. In this Cores of Reproducibility in Physiology (CORP) review, we summarize the fundamental principles underlying the use of partitional calorimetry, present the various methodological and arithmetic requirements, and provide typical examples of its use. Strategies to minimize estimation error of specific heat balance components, as well as the limitations of the method, are also discussed. The goal of this CORP paper is to present a standardized methodology and thus improve the accuracy and reproducibility of research employing partitional calorimetry.

Relationship between body heat content and finger temperature during cold exposure

2001 ◽  
Vol 90 (6) ◽  
pp. 2445-2452 ◽  
Author(s):  
Dragan Brajkovic ◽  
Michel B. Ducharme ◽  
John Frim
Keyword(s):  
Skin Temperature ◽  
Heat Storage ◽  
Heat Content ◽  
The Body ◽  
Finger Temperature ◽  
Finger Dexterity ◽  
The Relationship ◽  
Finger Skin ◽  
Body Heat ◽  
Partitional Calorimetry

The purpose of the present experiment was to examine the relationship between rate of body heat storage (S˙), change in body heat content (ΔHb), extremity temperatures, and finger dexterity. S˙, ΔHb , finger skin temperature (Tfing), toe skin temperature, finger dexterity, and rectal temperature were measured during active torso heating while the subjects sat in a chair and were exposed to −25°C air. S˙ and ΔHb were measured using partitional calorimetry, rather than thermometry, which was used in the majority of previous studies. Eight men were exposed to four conditions in which the clothing covering the body or the level of torso heating was modified. After 3 h, Tfing was 34.9 ± 0.4, 31.2 ± 1.2, 18.3 ± 3.1, and 12.1 ± 0.5°C for the four conditions, whereas finger dexterity decreased by 0, 0, 26, and 39%, respectively. In contrast to some past studies, extremity comfort can be maintained, despite S˙ that is slightly negative. This study also found a direct linear relationship between ΔHb and Tfing and toe skin temperature at a negative ΔHb. In addition, ΔHb was a better indicator of the relative changes in extremity temperatures and finger dexterity over time than S˙.

THE DETERMINATION OF RADIATION AND CONVECTION EXCHANGES BY PARTITIONAL CALORIMETRY

1936 ◽  
Vol 116 (3) ◽  
pp. 669-684 ◽  
Author(s):  
C. -E. A. Winslow ◽  
L. P. Herrington ◽  
A. P. Gagge
Keyword(s):  
Partitional Calorimetry

Assessment of Heat Storage Following Ice slurry Ingestion Using Partitional Calorimetry

2015 ◽  
Vol 47 ◽  
pp. 262-263
Author(s):  
Jason KW Lee ◽  
Ya Shi Teo ◽  
Pearl MS Tan ◽  
Maureen SH Lee
Keyword(s):  
Heat Storage ◽  
Ice Slurry ◽  
Partitional Calorimetry

Partitional calorimetry measurements of energy exchanges in severely burned patients

Burns ◽  
1981 ◽  
Vol 7 (3) ◽  
pp. 180-189 ◽  
Author(s):  
R. Henane ◽  
J. Bittel ◽  
V. Banssillon
Keyword(s):  
Energy Exchanges ◽  
Partitional Calorimetry

Thermal balance in ketamine-anesthetized rhesus monkey Macaca mulatta

1981 ◽  
Vol 241 (5) ◽  
pp. R301-R306 ◽  
Author(s):  
W. S. Hunter ◽  
K. R. Holmes ◽  
R. S. Elizondo
Keyword(s):  
Heat Loss ◽  
Thermal Conductance ◽  
Fold Increase ◽  
Thermal Balance ◽  
Evaporative Heat Loss ◽  
Metabolic Heat ◽  
Significant Difference ◽  
And Control ◽  
Ketamine Hcl ◽  
Partitional Calorimetry

A partitional calorimetry study compared thermoregulatory responses of unanesthetized adult rhesus monkeys (4 female, 1 male) to those anesthetized with ketamine HCl and exposed to ambient temperature (Ta) of 18, 29, 38 degrees C. Steady-state metabolic heat production (M), mean skin temperature (Tsk), rectal temperature (Tre), respiratory evaporative heat loss (Eres), and total evaporative heat loss (Etot) were measured at each Ta. Average Tre of anesthetized animals was reduced by approximately 1 degree C at Ta 18 degrees C, but thermal balance in anesthetized and control animals was maintained by reflexly decreased tissue conductance and shivering. For anesthetized animals, the average M increased 1.8 times over the lowest value of 40.13 W/m2 at Ta 29 degrees C, compared to a 1.5-fold increase for controls. Responses for both groups were not different at Ta 29 degrees C, both groups regulated body temperatures by vasodilation and increased sweating, but with ketamine sweating was reduced (35%). Effective tissue thermal conductance (K) was lowest at Ta 18 (10.8 W/m2 . degrees C) and increased to 39.4 W/m2 . degrees C at Ta 38 degrees C. No significant difference in K was found between ketamine and control groups at other Ta's.

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