Rheological modelling of physiological variables during temperature variations at rest |
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Authors: | P. Vogelaere F. De Meyer |
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Affiliation: | (1) Hoger Instituut voor Lichamelijke Opvoeding, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussel, Belgium;(2) Department Inwendige Geofysica, Konink lijk Meteorologisch Instituut, Ringlaan 3, B-1180 Brussel, Belgium |
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Abstract: | The evolution with time of cardio-respiratory variables, blood pressure and body temperature has been studied on six males, resting in semi-nude conditions during short (30 min) cold stress exposure (0°C) and during passive recovery (60 min) at 20°C. Passive cold exposure does not induce a change inHR but increasesVO2,VCO2Ve and core temperatureTre, whereas peripheral temperature is significantly lowered. The kinetic evolution of the studied variables was investigated using a Kelvin-Voigt rheological model. The results suggest that the human body, and by extension the measured physiological variables of its functioning, does not react as a perfect viscoelastic system. Cold exposure induces a more rapid adaptation for heart rate, blood pressure and skin temperatures than that observed during the rewarming period (20°C), whereas respiratory adjustments show an opposite evolution. During the cooling period of the experiment the adaptative mechanisms, taking effect to preserve core homeothermy and to obtain a higher oxygen supply, increase the energy loss of the body. |
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Keywords: | Rheology Human Heart rate Oxygen consumption Body temperature |
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