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Can infrared thermography be used to monitor fatigue during exercise? A case study

Journal of Sport and Health Science 2019年第1期8卷 89-92页

作者： Vedran Had?i Brane irok Ale? Malner?i? Milan oh Faculty of Sport University in Ljubljana Faculty of Mechanical Engineering University in Ljubljana

Background: Infrared thermographic imaging(IRTG) is a safe and reliable technology used to monitor skin temperature. The main aim of our study was to evaluate the relationship between skin temperature changes and muscle fatigue in order to answer the main research question if IRTG can be used to monitor muscle fatigue.Methods: This was a case study performed on a 23-year-old trained middle distance runner. After warm-up the subject was exercising on the dynamometer for 7.5 min at 120?/s performing only concentric contractions of quadriceps. At the same time IRTG recording of both(exercising and non-exercising) quadriceps was performed.Results: A correlational analysis that was performed in order to quantify the relationship between power and temperature change over time has shown that there is a significant negative correlation between skin temperature increase and power decrease(r = -0.543, p = 0.036) of exercising quadriceps. In linear regression model the exercising quadriceps power could be predicted from skin temperature. No such relationships were noted for the non-exercising limb that served as a control.Conclusion: We believe that correlation between skin temperature change and muscle power output as described in this case study deserves further analysis on the larger sample including subjects of the different ages, health status, and physical abilities in order to create a new tool for monitoring the muscle fatigue.

关键词： Correlation Fatigue Isokinetic Quadriceps Strength thermographic imaging

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Thermal Diagnosis of Heat Conduction and Combustion Time of Fruits of the Brazil Nut Tree (<i>Bertholletia excelsa</i>Bonpl.)

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Advances in Bioscience and Biotechnology 2020年第2期11卷 60-71页

作者： Adenes Teixeira Alves Lucieta Guerreiro Martorano Gelson Dias Florentino Dimas José Lasmar íres Paula de Andrade Miranda Leila Sheila Lisboa Jamal da Silva Chaar Federal University of Amazonas-UFAM Manaus Amazonas Brazil Brazilian Agricultural Research Corporation (EMBRAPA) Eastern Amazon (CPATU/NAPT) Santarém Pará Brazil Biodiversity and Biotechnology Network of the Legal Amazon (Bionorte) Belém Pará Brazil National Institute for Amazon Research (INPA) Manaus Amazonas Brazil Geoprocessing Belém Pará Brazil

The objective of this work was to evaluate the spatial and temporal dynamics of the process of combustion of fruits of the Brazil nut tree (Bertholletia excelsa Bonpl.) using thermographic images in order to characterize the potential of this biomass as an energy source for use in ceramic kilns. Infrared thermography was used as a diagnostic tool, and the trial was conducted in November 2018, in two blocks with two repetitions in each, with the fruits organized so that the cavity was oriented upward and also downward. The thermograms were analyzed using Flir Tools (6.3 v). The temperatures were the highest in the center of the fruits (>160°C), attaining incandescence in 6 min 30 s. Heat was propagated from the center to the edge, and this process was quicker for fruits with their cavities pointed upward. A second order polynomial model explained combustion time with a maximum duration of 7.2 minutes. The thermographic diagnostic has the potential to be used in management strategies for this biomass as an energy source, thus aggregating value to the residuals that are normally left in the forest during harvest by extractivists.

关键词： Residual Biomass thermographic Patterns Non-Wood Forest Products

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