Exergy Analysis of the Musculoskeletal System Efficiency during Aerobic and Anaerobic Activities

Autor(es)

Spanghero, Gabriel Marques ^[1] ; Albuquerque, Cyro ^[2] ; Fernandes, Tiago Lazzaretti ^[3] ; Hernandez, Arnaldo Jose ^[3] ; Keutenedjian Mady, Carlos Eduardo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Mech Engn, BR-13083970 Campinas, SP - Brazil

^[2] FEI, Ctr Univ, Dept Mech Engn, BR-09850901 Sao Bernardo Do Campo - Brazil

^[3] Univ Sao Paulo, Sch Med, Dept Orthoped & Traumatol, Sports Med Grp, BR-01246000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Entropy; v. 20, n. 2 FEB 2018.
• Citações Web of Science: 6

Resumo

The first and second laws of thermodynamics were applied to the human body in order to evaluate the quality of the energy conversion during muscle activity. Such an implementation represents an important issue in the exergy analysis of the body, because there is a difficulty in the literature in evaluating the performed power in some activities. Hence, to have the performed work as an input in the exergy model, two types of exercises were evaluated: weight lifting and aerobic exercise on a stationary bicycle. To this aim, we performed a study of the aerobic and anaerobic reactions in the muscle cells, aiming at predicting the metabolic efficiency and muscle efficiency during exercises. Physiological data such as oxygen consumption, carbon dioxide production, skin and internal temperatures and performed power were measured. Results indicated that the exergy efficiency was around 4% in the weight lifting, whereas it could reach values as high as 30% for aerobic exercises. It has been shown that the stationary bicycle is a more adequate test for first correlations between exergy and performance indices. (AU)

• Processo FAPESP: 15/15243-1 - Análise exergética do trabalho muscular
• Beneficiário: Gabriel Marques Spânghero
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/22883-7 - Análise termodinâmica aplicada a sistemas biológicos
• Beneficiário: Carlos Eduardo Keutenedjian Mady
• Modalidade de apoio: Auxílio à Pesquisa - Regular