ARNALDO JOSE HERNANDEZ
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Ortopediae Traumatologia, Faculdade de Medicina - Docente
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
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- AN INEXPENSIVE METHOD TO MEASURE KNEE EXTENSORS' POWER IN OLDER ADULTS(2015) PINHO, Joao Pedro; MEZENCIO, Bruno; CLAUDINO, Joao Gustavo Oliveira; SONCIN, Rafael; HERNANDEZ, Arnaldo Jose; SERRAO, Julio Cerca; AMADIO, Alberto CarlosIntroduction: Measuring knee extensors' power in elderly population is crucial but not accessible to everyone. Objective: To provide a method to calculate knee extensors' power in a conventional knee extension machine. Method: Thirteen sedentary elderly women (69.3 +/- 4.1 years) performed six knee extensions as fast as possible. Kinematic data, an anthropometric model and Newtonian mechanics was used to write movement equations that allowed calculating knee extensors' power and work. The reliability was assessed by variables' coefficient of variation, intraclass correlation coefficient and standard measurement error. Results: Knee extensors' peak power and work values obtained were in agreement with the literature. We found high intraclass ICC values for both variables (93% and 97%, respectively) and low normalized SEM (10.13% and 2.09%, respectively). Conclusion: We provided an inexpensive method to assess a major physical dysfunction indicator in older adults which can also be used to evaluate the progression of an intervention.
- BRAZILIAN JOURNAL OF SPORTS MEDICINE: TEAM WORK IN THE NAME OF SCIENCE(2011) HERNANDEZ, Arnaldo Jose
- QUESTIONÁRIO DE PRONTIDÃO PARA O ESPORTE COM FOCO NAS LESÕES MUSCULOESQUELÉTICAS(2016) SILVEIRA JUNIOR, Jose Antonio da; COELHO, Christianne de Faria; HERNANDEZ, Arnaldo Jose; ESPINOSA, Mariano Martinez; CALVO, Adriano Percival Calderano; RAVAGNANI, Fabricio Cesar de PaulaIntrodução: As lesões esportivas são desordens que têm grande impacto no desempenho do atleta. Objetivo: Desenvolver e validar um questionário de pré-participação em esportes que identifique atletas com fatores de risco ou probabilidade de lesão musculoesquelética, a fim de selecioná-los para avaliação médica especializada. Métodos: Utilizou-se a técnica Delphi, que consiste em reunir informações e chegar a um consenso de especialistas sobre um tema não encontrado na literatura pertinente. A versão inicial do questionário de prontidão para o esporte com foco nas lesões musculoesqueléticas (MIR-Q) foi embasada na experiência do pesquisador nas áreas de ortopedia/traumatologia esportiva e medicina do exercício e do esporte (MEE) e amparada por referenciais teóricos. Resultados: Na fase piloto realizou-se a análise de conteúdo do MIR-Q com avaliação de nove especialistas em MEE. Das sete questões iniciais, houve a retirada da questão cinco. Na primeira rodada da técnica Delphi, 25 especialistas avaliaram as seis questões do MIR-Q. As rodadas de avaliação foram programadas para repetição, caso não se alcançasse o mínimo de concordância de 75% entre as respostas da maioria dos especialistas (mais de 50%) para cada questão, utilizando-se uma escala tipo Likert, com variação de 1 a 5. Na rodada um, três questões foram modificadas, e obteve-se consenso (concordância de 80% a 100%), índice que variou de 75% a 87,5% quanto à reprodutibilidade. A medida da consistência interna do MIR-Q (alfa de Cronbach) foi satisfatória tanto na primeira rodada (0,70) quanto na reprodutibilidade (0,88). Conclusão: Considera-se que o MIR-Q é um instrumento simples e válido, do ponto de vista da validade do conteúdo, para triagem de atletas com possíveis lesões musculoesqueléticas e encaminhamento ao médico especialista.
- APPLICATION OF MEDICAL INFRARED THERMOGRAPHY TO SPORTS MEDICINE(2016) CORTE, Ana Carolina Ramos e; HERNANDEZ, Arnaldo JoseMedical infrared thermography is a non-invasive, non-radioactive detection tool that is capable of analyzing physiological functions related to skin temperature control. Thermography detects infrared light emitted by the body and visualizes changes in body temperature related to changes in blood flow. It is not a method that shows anatomical abnormalities, but it is capable of showing physiological changes. There are various applications of thermography in the field of medicine: neurological, rheumatological and muscular disorders, vascular diseases, urological, gynecological and orthopedic disorders, and sports medicine. For all medical fields, thermography is established as a measure that provides a visual map of skin temperature distribution. Termography should not be used as the sole diagnostic tool. Clinical examinations should be performed to interpret the thermograms. In medical applications, this technique only provides an image of the distribution of skin temperature; it is not capable of showing data for a deep surface layers of the body, as is possible with other imaging exams. However it is a non-invasive, objective method, as well as being safe and harmless. In sports medicine, the use of thermography can provide better results for athletes, as it is an instrument for identifying risks and preventing injuries, as well as an important tool for monitoring sports training, based on the evaluation of training load.
- CLINICAL APPLICATION OF THERMOGRAPHY FOR ENERGY BALANCE IN ATHLETES - STATE OF THE ART AND NEW PARADIGMS(2018) FERNANDES, Tiago Lazzaretti; HERNANDEZ, Arnaldo Jose; ALBUQUERQUE, Cyro; MADY, Carlos Eduardo KeutenedjianThis article aims to describe the evolution of techniques that have enabled the proper application of the Laws of Thermodynamics for physical activity and athletes. The objective is to propose performance indicators to help add information to the current indices used in medicine and sports, such as the lactate threshold and maximum oxygen consumption. A number of analyses of the results obtained by the group were carried out for this purpose. Moreover, a discussion regarding which techniques would provide a better response to the measurements was analyzed. Some examples are the substitution of the treadmill running test with the stationary bicycle (known performed work), and a literature search in order to measure internal temperature more accurately.
- A BIOMECHANICAL COMPARISON OF MATCHED FOUR-STRAND AND FIVE-STRAND SEMITENDINOSUS-GRACILIS GRAFTS(2021) BARROS, Marcos Amstalden; COSTA, Sandokan Cavalcante; JARAMILLO, Diego Eduardo Rubio; ALMEIDA, Adriano Marques de; PEREIRA, Cesar Augusto Martins; FERNANDES, Tiago Lazzaretti; NARDELLI, Julio Cesar Carvalho; ANNICHINO, Marcel Fruschein; PEDRINELLI, Andre; HERNANDEZ, Arnaldo JoseIntroduction: Recent studies have shown that the likelihood of semitendinosus-gracilis graft rupture is inversely correlated to its diameter. A graft can be prepared in a five-strand or four-strand fashion to increase its diameter. However, the biomechanical superiority of five-strand semitendinosus-gracilis grafts is still under debate. Objective: This study aimed to evaluate the biomechanical characteristics of matched four-strand and five-strand human semitendinosus-gracilis grafts. Methods: We evaluated semitendinosus-gracilis tendons harvested from ten fresh human male and female cadavers, aged 18-60 years. Four-strand or five-strand grafts were prepared with the tendons and fixed to wooden tunnels with interference screws. Each graft was submitted to axial traction at 20 mm/min until rupture; the tests were donor matched. Data were recorded in real time and included the analysis of the area, diameter, force, maximum deformation and stiffness of the grafts. Results: The diameter, area and tunnel size were significantly greater in the five-strand grafts than in the four-strand grafts. There were no significant differences in biomechanical properties. The area and diameter of the graft were positively correlated to stiffness, and inversely correlated to elasticity. There was no significant correlation between graft size and maximum force at failure, maximum deformation or maximum tension. Conclusion: Five-strand hamstring grafts have greater area, diameter and tunnel size than fourstrand grafts. There were no significant differences in biomechanical properties. In this model using interference screw fixation, the increases in area and diameter were correlated with an increase in stiffness and a decrease in elasticity.
- Evaluation of the passive resistive torque in female athletes with ankle sprain(2012) BARBANERA, Marcia; ARAUJO, Rubens Correa; FERNANDES, Tulio Diniz; HERNANDEZ, Arnaldo JoseIntroduction: The ankle sprain is one of the most common injuries in athletes. Direct evaluation of the ligament laxity can be obtained through the objective measurement of extreme passive inversion and eversion movements, but there are few studies on the use of the evaluation of the passive resistive torque of the ankle to assess the capsule and ligaments resistance. Objective: The aim of this study was to compare the inversion and eversion passive torque in athletes with and without ankle sprains history. Method: 32 female basketball and volleyball athletes (16.06 +/- 0.8 years old; 67.63 +/- 8.17 kg; 177.8 +/- 6.47 cm) participated in this study. Their ankles were divided into two groups: control group (29), composed of symptom-free ankles, and ankle sprain group, composed of ankles which have suffered injury (29). The resistive torque at maximum passive ankle movement was measured by the isokinetic dynamometer and the muscular activity by electromyography system. The athletes performed 2 repetitions of inversion and eversion movement at 5, 10 and 20 degrees/s and the same protocol only at maximum inversion movement. Results: The resistive passive torque during the inversion and eversion was lower in the ankle sprain group. This group also showed lower torques at the maximum inversion movement. No differences were observed between inversion and eversion movement. Conclusions: Ankle sprain leads to lower passive torque, indicating reduction of the resistance of the lateral ankle ligaments and mechanical laxity.
- Articles Published in Brazilian Journals Relevant to Sports and Exercise Medicine; a Review(2011) HERNANDEZ, Arnaldo JoseThe purpose of this new series of 34 articles is to alert national and international readers to some of the most important recent contributions of the Brazilian medical literature in other areas of specialization. These are works that offer support to many lines of research in this area. The most relevant original articles are selected by experienced editors, who provided us with key words, which are highlighted in order to attract readers' attention. To facilitate reading, the articles are organized by area of interest. To make the maximum use of the limited editorial space, the authors' names are omitted. The final result brings the best of each article, in the authors' opinion, with a personal summary interpretation. Targeted at busy doctors, we hope this initiative will help further knowledge of scientific evidence for use in clinical practice, facilitating access to works of specific interest to the reader.
- MODERATE INTENSITY IS A BETTER STIMULUS TO INDUCE QUADRIPECS FEMORIS POWER IN ELDERLY ADULTS(2018) PINHO, Joao Pedro; MEZENCIO, Bruno; HERNANDEZ, Arnaldo Jose; BONATO, Jessica; MASUKO, Wellington; SONCIN, Rafael; CLAUDINO, Joao Gustavo; SERRAO, Julio Cerca; AMADIO, Alberto CarlosIntroduction:The best strategy for improving knee extensor power, a major functional capacity indicator in older adults, is power training. Nonetheless, the training intensity required to induce optimal gains is yet to be found. Objective: Our purpose was to compare knee extensor peak power responses between low, moderate, and high intensity load conditions (30%, 50% and 70% of 1RM). Methods: Thirteen sedentary elderly women performed six knee extensions in each load condition, calculating knee extensor mechanical work/power output and knee extension peak angular velocity. Results: No difference in peak power was found between the high (207.0 +/- 68.1 W) and moderate (206.1 +/- 71.6 W) load conditions (p = 0.994), and both had higher values (p 0.004) than the low intensity condition (135.6 +/- 56.3 W). Conclusion: Moderate load at 50% of 1RM appears to be the preferred strategy for inducing knee extensor power output because in contrast with the high intensity condition, the moderate load yielded higher angular peak velocity, which is also a functional indicator.