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Author: Peter Tikuisis
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
A multi-compartmental mathematical model for predicting human thermoregulatory responses was applied to immersion in moderately cold water. Data wer4e used from experiments where eight healthy male volunteers were used from experiments where eight healthy male volunteers were immersed nude and up to the neck for 1 h in water at 20 and 24c under conditions of rest and exercise. Rectal temperature and metabolic rate were measured before and during immersion. Once agreement between the model prediction and experimental observation was obtained, the model was used for prediction beyond the duration of the experiment. Stabilization of core temperature was predicted after 4-5 h of immersion for rest and after 2-4 for exercise. Stabilization for resting individuals has been observed in other experiments under similar conditions. These results suggest that linear extrapolations based on linear body cooling rates are inadequate for predicting endurance times in moderately cold water, In this study, predicted endurance times were based on the concept of relative exercise intensity and are in agreement with the limited data available. Keywords: Tolerances (Physiology), Body temperature, Reprints. (sdw).
Author: Peter Tikuisis
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
A multi-compartmental mathematical model for predicting human thermoregulatory responses was applied to immersion in moderately cold water. Data wer4e used from experiments where eight healthy male volunteers were used from experiments where eight healthy male volunteers were immersed nude and up to the neck for 1 h in water at 20 and 24c under conditions of rest and exercise. Rectal temperature and metabolic rate were measured before and during immersion. Once agreement between the model prediction and experimental observation was obtained, the model was used for prediction beyond the duration of the experiment. Stabilization of core temperature was predicted after 4-5 h of immersion for rest and after 2-4 for exercise. Stabilization for resting individuals has been observed in other experiments under similar conditions. These results suggest that linear extrapolations based on linear body cooling rates are inadequate for predicting endurance times in moderately cold water, In this study, predicted endurance times were based on the concept of relative exercise intensity and are in agreement with the limited data available. Keywords: Tolerances (Physiology), Body temperature, Reprints. (sdw).
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Category : Aeronautics
Languages : en
Pages : 248
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Book Description
Author: Theodoros Aslanidis
Publisher: BoD – Books on Demand
ISBN: 1838805184
Category : Medical
Languages : en
Pages : 140
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Book Description
Heart rate variability (HRV) is considered a reliable reflection of the many physiological factors modulating the normal rhythm of the heart. It reflects autonomic nervous system (ANS) function, and as such, it is used in numerous fields of medicine. Written by experts in the field, this book provides a comprehensive overview of HRV. The first section is dedicated to technical themes related to monitoring and the variables recorded. The second section highlights use of HRV in hypothermia. Finally, the third section covers general aspects of HRV application.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 492
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Author:
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ISBN:
Category : Exercise
Languages : en
Pages : 510
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Book Description
Consists of citations selected from those contained in the National Library of Medicine's Medical Literature Analysis and Retrieval System.
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ISBN:
Category :
Languages : en
Pages : 55
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Book Description
The mathematical models of thermoregulation of Stolwijk and Hardy and Montgomery were used to develop a model suitable for the simulation of human physiological responses to cold-water immersion. Data were obtained from experiments where thirteen healthy male volunteers were totally immersed under resting and nude conditions for 1 h in water temperatures of 20 and 28 C. Mean measured rectal temperature (Tre) fell by about 0.9 and 0.5 C in 20 and 28 C water for all subjects, yet mean measured metabolic rate (M) rose by about 275 and 90 W for the low body fat group (n=7) and 195 and 45 W for the moderate body fat group (n=6). To predict the observed Tre and M values, the present model a) included thermal inputs for shivering from the skin independent of their inclusion with the central temperature to account for the observed initial rapid rise in M, b) determined a thermally neutral body temperature profile such that the measured and predicted initial values of Tre and M were matched, c) confined the initial shivering to the trunk region to avoid an overly large predicted initial rate of rectal cooling, and d) calculated the steady-state convective heat loss by assuming a zero heat storage in the skin compartment to circumvent the acute sensitivity to the small skin-water temperature difference when using conventional methods. The last three modifications are unique to thermoregulatory modeling. A BASIC computer listing of the model and a sample simulation are provided.
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Category : Aviation medicine
Languages : en
Pages : 984
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Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1422
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Book Description
Author: Peter Tikuisis
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
A mathematical model of thermoregulation has been developed to simulate human physiological responses to cold-water immersion. Data were obtained from experiments where thirteen healthy male volunteers were totally immersed under resting and nude conditions for 1 h in water temperatures of 20 and 28 C. Mean measured rectal temperature (T sub re) fell by about 0.9 and 0.5 C in 20 and 28 C water for all subjects, yet mean measured metabolic rate (M) rose by about 275 and 90 W for the lean mass group (n=7) and 195 and 45 W for the normal mass group (n=6). To predict the observed T sub re and M values, the present model differed from its predecessors by a) determining a thermally neutral body temperature profile such that the measured and predicted initial values of T sub re and M were matched, b) including thermal inputs for shivering from the skin independent of their inclusion with the central temperature to account for the observed initial rapid rise in M, c) confining the initial shivering to the trunk region to avoid an overly large predicted initial rate of rectal cooling, and d) calculating the steady state of convective heat loss by assuming a zero rate of heat storage in the skin compartment.
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1148
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Book Description
