Direct Quantitation of Heat Loss in Human Subjects Using Infrared Thermography
Shuran, Melanie
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Permalink
https://hdl.handle.net/2142/77466
Description
Title
Direct Quantitation of Heat Loss in Human Subjects Using Infrared Thermography
Author(s)
Shuran, Melanie
Issue Date
1988
Doctoral Committee Chair(s)
Nelson, Ralph A.,
Department of Study
Food Science
Discipline
Food Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Health Sciences, Nutrition
Language
eng
Abstract
Infrared thermography (IRT) can be used to quantitate changes in mean surface temperature. This value is one variable used in heat loss equations which permits computation of radiant, convective, evaporative and total heat losses from subjects. The portable, non-contact, non-invasive nature of the IRT system makes it adaptable for use outside of the research setting. Heat loss measured by IRT and heat production obtained by indirect calorimetry (IC) were quantitated from human subjects during fasting, postprandially and during continuous infusion of nutrients (intraprandially). Under these conditions, no statistically significant differences were noted between IRT and IC validating the ability of the IRT system to quantitate heat loss. Differences in oxidative metabolism and heat loss after eating were demonstrated by both methods especially when these data were compared to those obtained during fasting. During the postprandial studies, IC values increased significantly 30 minutes after eating, while heat loss was not significantly elevated until 60 minutes postprandially. This 30 minute lag period between heat production and heat loss most likely reflects negative feedback control of body core temperature occurring in response to the thermogenesis associated with feeding and fasting. With continuous administration of nutrients, differences in heat loss, heat production and energy intakes were demonstrated, with IRT at times exceeding both IC and energy intake. These findings point to the existence of variations between individuals in the efficiency with which they utilize energy which might not be reflected in measurements of oxidative metabolism alone. It is in the study of the efficiency of metabolism that the IRT system holds the greatest research potential.
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