Elderly bioheat modeling: changes in physiology, thermoregulation, and blood flow circulation
| Autor: | Mohamad Ali Rida, Kamel Ghali, Jamal J. Hoballah, Nesreen Ghaddar |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Aging Atmospheric Science medicine.medical_specialty Health Toxicology and Mutagenesis Models Biological Constriction Fingers Internal medicine medicine Humans Computer Simulation Aged Aged 80 and over Core (anatomy) integumentary system Ecology Vasomotor Chemistry Temperature Skin temperature Blood flow Thermoregulation Vasomotor System Regional Blood Flow Anesthesia Circulatory system Cardiology Female medicine.symptom Skin Temperature Blood Flow Velocity Vasoconstriction Body Temperature Regulation |
| Zdroj: | International Journal of Biometeorology. 58:1825-1843 |
| ISSN: | 1432-1254 0020-7128 |
| DOI: | 10.1007/s00484-013-0785-1 |
| Popis: | A bioheat model for the elderly was developed focusing on blood flow circulatory changes that influence their thermal response in warm and cold environments to predict skin and core temperatures for different segments of the body especially the fingers. The young adult model of Karaki et al. (Int J Therm Sci 67:41-51, 2013) was modified by incorporation of the physiological thermoregulatory and vasomotor changes based on literature observations of physiological changes in the elderly compared to young adults such as lower metabolism and vasoconstriction diminished ability, skin blood flow and its minimum and maximum values, the sweating values, skin fat thickness, as well as the change in threshold parameter related to core or skin temperatures which triggers thermoregulatory action for sweating, maximum dilatation, and maximum constriction. The developed model was validated with published experimental data for elderly exposure to transient and steady hot and cold environments. Predicted finger skin temperature, mean skin temperature, and core temperature were in agreement with published experimental data at a maximum error less than 0.5 °C in the mean skin temperature. The elderly bioheat model showed an increase in finger skin temperature and a decrease in core temperature in cold exposure while it showed a decrease in finger skin temperature and an increase in core temperature in hot exposure. |
| Databáze: | OpenAIRE |
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