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Exergy performance of human body under physical activities

Author

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  • Mady, Carlos Eduardo Keutenedjian
  • Albuquerque, Cyro
  • Fernandes, Tiago Lazzaretti
  • Hernandez, Arnaldo José
  • Saldiva, Paulo Hilário Nascimento
  • Yanagihara, Jurandir Itizo
  • de Oliveira, Silvio

Abstract

The aim of this work is to apply performance indicators for individuals under physical activity based on the concepts of exergy destroyed and exergy efficiency. The cardiopulmonary exercise test is one of the most used tests to assess the functional capacity of individuals with varying degrees of physical training. To perform the exergy analysis during the test, it is necessary to calculate heat and mass flow rates, associated with radiation, convection, vaporization and respiration, determined from the measurements and some relations found in the literature. The energy balance allowed the determination of the internal temperature over time and the exergy variation of the body along the experiment. Eventually, it was possible to calculate the destroyed exergy and the exergy efficiency from the exergy analysis. The exergy rates and flow rates are dependent of the exercise level and the body metabolism. The results show that the relation between the destroyed exergy and the metabolism is almost constant during the test, furthermore its value has a great dependence of the subject age. From the exergy analysis it was possible to divide the subjects according to their training level, for the same destroyed exergy, subjects with higher lactate threshold can perform more work.

Suggested Citation

  • Mady, Carlos Eduardo Keutenedjian & Albuquerque, Cyro & Fernandes, Tiago Lazzaretti & Hernandez, Arnaldo José & Saldiva, Paulo Hilário Nascimento & Yanagihara, Jurandir Itizo & de Oliveira, Silvio, 2013. "Exergy performance of human body under physical activities," Energy, Elsevier, vol. 62(C), pages 370-378.
    • Handle: RePEc:eee:energy:v:62:y:2013:i:c:p:370-378
    DOI: 10.1016/j.energy.2013.09.050
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    1. Keutenedjian Mady, Carlos Eduardo & Silva Ferreira, Maurício & Itizo Yanagihara, Jurandir & Hilário Nascimento Saldiva, Paulo & de Oliveira Junior, Silvio, 2012. "Modeling the exergy behavior of human body," Energy, Elsevier, vol. 45(1), pages 546-553.
    2. Prek, Matjaz, 2006. "Thermodynamical analysis of human thermal comfort," Energy, Elsevier, vol. 31(5), pages 732-743.
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    5. Ribeiro, Thatiana Jessica da Silva & Mady, Carlos Eduardo Keutenedjian, 2022. "Comparison among exergy analysis methods applied to a human body thermal model," Energy, Elsevier, vol. 239(PE).
    6. Mady, Carlos Eduardo Keutenedjian & Henriques, Izabela Batista & de Oliveira, Silvio, 2015. "A thermodynamic assessment of therapeutic hypothermia techniques," Energy, Elsevier, vol. 85(C), pages 392-402.
    7. Juliana Rangel Cenzi & Cyro Albuquerque & Carlos Eduardo Keutenedjian Mady, 2019. "Phenomenological and Thermodynamic Model of Gas Exchanges in the Placenta during Pregnancy: A Case Study of Intoxication of Carbon Monoxide," IJERPH, MDPI, vol. 16(21), pages 1-16, October.
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    9. Børset, M.T. & Kolbeinsen, L. & Tveit, H. & Kjelstrup, S., 2015. "Exergy based efficiency indicators for the silicon furnace," Energy, Elsevier, vol. 90(P2), pages 1916-1921.
    10. Henriques, Izabela Batista & Mady, Carlos Eduardo Keutenedjian & de Oliveira Junior, Silvio, 2017. "Assessment of thermal comfort conditions during physical exercise by means of exergy analysis," Energy, Elsevier, vol. 128(C), pages 609-617.

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