Document Detail

Conflicts of thermal adaptation and fever--a cybernetic approach based on physiological experiments.
MedLine Citation:
PMID:  9778894     Owner:  NLM     Status:  MEDLINE    
Cold adaptation aims primarily at a better economy, i.e., preservation of energy often at the cost of a lower mean body temperature during cold stress, whereas heat adaptation whether achieved by exposure to a hot environment or by endogenous heat produced by muscle exercise, often brings about a higher efficiency of control, i.e., a lower mean body temperature during heat stress, at the cost of a higher water loss. While cold adaptation is beneficial in a cold environment, it may constitute a detrimental factor for exposure to a hot environment, mainly because of morphological adaptation. Heat adaptation may be maladaptive for cold exposure, mainly because of functional adaptation. Heat adaptation clearly is best suited to avoid higher body temperatures in fever, no matter which environmental conditions prevail. On the other hand, cold adaptation is detrimental for coping with fever in hot environment. Yet, in the cold, preceding cold adaptation may, because of reduced metabolic heat production, result in lower febrile increase of body temperature. Apparently controversial effects and results may be analyzed in the framework of a cybernetic approach to the main mechanisms of thermal adaptation and fever. Morphological adaptations alter the properties of the heat transfer characteristics of the body ("passive system"), whereas functional adaptation and fever concern the subsystems of control, namely sensors, integrative centers and effectors. In a closed control-loop the two types of adaptation have totally different consequences. It is shown that the experimental results are consistent with the predictions of such an approach.
J Werner; U Beckmann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Fiziologiia cheloveka     Volume:  24     ISSN:  0131-1646     ISO Abbreviation:  Fiziol Cheloveka     Publication Date:    1998 Jul-Aug
Date Detail:
Created Date:  1998-11-25     Completed Date:  1998-11-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7603567     Medline TA:  Fiziol Cheloveka     Country:  RUSSIA    
Other Details:
Languages:  eng     Pagination:  22-8     Citation Subset:  IM    
Center for Biomedical Methods, Ruhr University, Bochum, Germany.
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MeSH Terms
Acclimatization / physiology
Adaptation, Physiological*
Body Temperature Regulation / physiology*
Cold Temperature
Fever / physiopathology*
Hot Temperature*
Time Factors

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