Navegando por Assunto "Fadiga"

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Análise Psicométrica da Versão Brasileira da Pittsburgh Fatigability Scale (PFS-Brasil)
(Universidade Federal do Pará, 2024-04-24) SANTOS, Mayara do Socorro Brito dos; TORRES, Natáli Valim Oliver Bento; http://lattes.cnpq.br/1927198788019996; https://orcid.org/0000-0003-0978-211X
Introduction: Instruments with appropriate psychometric properties are essential for ensuring the quality of assessments and reassessments in clinical practice, guiding decision-making regarding rehabilitation procedures. The Pittsburgh Fatigability Scale, originally published in English, is the only validated scale for measuring perceived fatigability in older adults. Considering the importance of this tool, it is necessary to validate its translated version into Portuguese and adapt it to the specificities of the Brazilian context. Objective: To validate the Pittsburgh Fatigability Scale Brazilian Portuguese version (PFS-Brasil) by evaluating its validity in relation to measures of physical activity, physical performance, and cognitive performance. Methodology: The scale and physical and cognitive performance tests were used to assess 121 healthy older adults residing in the community. We conducted statistical analyses of the physical and mental subscales of the PFS-Brasil, utilizing the intraclass correlation coefficient (ICC) for reliability analysis, Cronbach's alpha for internal consistency evaluation, and Spearman's correlation for convergent validity. Furthermore, we examined agreement analysis and floor and ceiling effects. The Statistical Package for Social Sciences 25.0 was used for data analysis. Results: The analyses indicated that the physical and mental subscales exhibit satisfactory test-retest reliability, with ICC values for the physical subscale (0.84; 95% CI: 0.80-0.88) and the mental subscale (0.83; 95% CI: 0.78-0.87), in addition to high internal consistency (α = 0.84 and 0.82, respectively). These values are indicative of good inter-rater reliability, revealing a low probability of random and systematic error. Bland-Altman plots demonstrated good agreement for both subscales of the PFS-Brasil. For convergent validity, the higher physical score showed a moderate association, and the higher mental score showed a weak association with lower physical performance (6-minute walk tests and the Short Physical Performance Battery (SPPB) and lower levels of physical activity (International Physical Activity Questionnaire – IPAQ). Regarding cognitive performance, there was a weak association between the higher mental score and the average accuracy on the flanker test. No ceiling effects were observed in both subscales; however, the mental subscale exhibited a floor effect (n = 24%). Conclusion: This study demonstrated that the Brazilian version of the Pittsburgh Fatigability Scale is a valid, consistent, and reliable instrument for assessing perceived fatigability in older adults.
Acesso aberto (Open Access)
Estudo do comportamento dos aços ferramentas soldados em fadiga
(Universidade Federal do Pará, 2011-02-28) MONTEIRO, Alberto de Castro; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
Knowing that fatigue is a gradual reduction of the carrying capacity of the component by slow and gradual breakdown of the material. And this defect arises from the infinitesimal advance of microcracks that form inside the material, imperceptible to the naked eye, it is also clear that the presence of alloying elements in steels, allows changes in metallurgy and mechanical properties of the material, applied to work. On the other hand, when he underwent processing of diverse, they all zones deform elastic, plastic, and after break up. Emphasizing the goal of this study, intended to address the welded joints, in stages that are subjected to high temperatures and cools without control, even at room temperature. In the end, are requested by cyclic alternating or constant. In particular, it is expected to detect structural changes deep in the Heat Affected Zone - ZTA, suffered because of overheating, both near the midpoint of the weld pool and in the region and located in the neighborhood. As we do not have enough parameters and necessary to control these changes, we propose to analyze the HAZ of the welded joint in order to evaluate the metallurgical behavior and its implications caused by gas-metal interactions. To analyze the effects of the triangle formed by the base material AISI / SAE 4340, SAE 1020 and chamfered V-coated electrode E-6013. Structure analysis will be performed by testing techniques using the metallographic optical microscopy - MO which is widely circulated in technical and scientific communications, through which, the transformations distinguish multiphasic. These transformations, distinguished by direct transformation of austenite to martensite without passing through the ferrite and pearlite. With these identities, metallography can characterize and predict the future responses of the structures by analyzing the requests, which may besubmitted. To analyze the fatigue behavior of materials in question, it is adopted as a parameter ancillary testing the Charpy pendulum. Therefore, the results obtained, we conclude that structures are compromised by tensions 05/05/2011 internal consequently weaken, but welding procedure can be adopted, followed annealing for stress relief, if not make cracks.
Acesso aberto (Open Access)
Tradução e adaptação transcultural da Pittsburgh Fatigability Scale para o português brasileiro
(Universidade Federal do Pará, 2023-04-28) SANTANA, Larissa Lopes; TORRES, Natáli Valim Oliver Bento; http://lattes.cnpq.br/1927198788019996; https://orcid.org/0000-0003-0978-211X
Background: Fatigue is a symptom associated with the weakening or depletion of an individual's physical and/or mental resources. The term fatigability comprises the subjective perception of fatigue in face of activities of specific intensity and duration. The Pittsburg Fatigability Scale (PFS), originally published in English, is the only validated scale to measure perceived fatigability in older adults. Considering the importance of specific assessment in the aging population for the prevention of conditions and for the rehabilitation, it is necessary to translate and adapt it cross-culturally to the specificities of the Brazilian context. Objective: To translate and cross-culturally adapt the Pittsburgh Fatigability Scale into Brazilian Portuguese to assess fatigability in the Brazilian older adults population. Methodology: We carried out the translation and cross-cultural adaptation to generate the PFS version in Brazilian Portuguese (PFS-Brasil), following the steps: translation from the source language (English), comparison and synthesis of translated versions, blind back-translation, comparison of back-translations and assessment of instrument clarity by the expert committee. People aged 60 years and overwho met the inclusion and exclusion criteria were invited to participate voluntarily in the study after approval by the Research Ethics Committee of the Institute of Health Sciences of the Federal University of Pará (nº 56210622.0.0000.0018) and signature of the TCLE. Each participant provided demographic data, responded to the PFS-Brasil and reported their understanding, difficulty in responding and suggestions about each item on the scale. All assessments were performed in environments with noise, temperature and lighting control to ensure privacy and comfort conditions for the proper performance of the tests. The R software was used to analyze the evidence of construct validity and instrument precision based on Confirmatory Factor Analysis (CFA), Cronbach's (α), McDonald's (ω) and composite reliability. Results: The Brazilian version of the PFS (PFS-Brasil) was developed. The pilot test referring to the last phase of the cross-cultural adaptation was carried out with 103 participants, predominantly female (81.5%), married (41.7%), brown (60.1%), who did not have COVID-19 (50.4%) and who perform some type of physical activity (64%). Confirmatory factor analyzes carried out point to the adequacy of bifactorial models for both subscales (x²: 48.53 for the physical subscale and x²: 35.05 for the mental subscale), with excellent and satisfactory internal consistency in factors 1 (⍺: 0, 9) and 2 (⍺: 0.76) of the Mental Fatigue subscale, respectively. As for the Physical Fatigue subscale, it presented very good results for factor 1 (⍺: 0.8) and satisfactory for factor 2 (⍺: 0.6). Conclusion: The present study demonstrated that the Brazilian version of the Pittsburgh Fatigability Scale has adequate construct validity for assessing perceived fatigability in older adults, both in its physical and mental subscales.