Abstract Background The saccadic eye movement is responsible for providing focus to a visual object of interest to the retina. In sports like volleyball, identifying relevant targets quickly is essential to a masterful performance. The training improves cortical regions underlying saccadic action, enabling more automated processing in athletes. Objective We investigated changes in the latency during the saccadic eye movement and the absolute theta power on the frontal and prefrontal cortices during the execution of the saccadic eye movement task in volleyball athletes and non-athletes. We hypothesized that the saccade latency and theta power would be lower due to training and perceptual-cognitive enhancement in volleyball players. Methods We recruited 30 healthy volunteers: 15 volleyball athletes (11 men and 4 women; mean age: 15.08 ± 1.06 years) and 15 non-athletes (5 men and 10 women; mean age: 18.00 ± 1.46 years). All tasks were performed simultaneously with electroencephalography signal recording. Results The latency of the saccadic eye movement presented a significant difference between the groups; a shorter time was observed among the athletes, associated with the players' superiority in terms of attention level. During the experiment, the athletes observed a decrease in absolute theta power compared to non-athletes on the electrodes of each frontal and prefrontal area. Conclusion In the present study, we observed the behavior of reaction time and absolute theta power in athletes and non-athletes during a saccadic movement task. Our findings corroborate the premise of cognitive improvement, mainly due to the reduction of saccadic latency and lower beta power, validating the neural efficiency hypothesis.

Resumo Antecedentes O movimento ocular sacádico é responsável por dar foco a um objeto visual de interesse para a retina. Em esportes como o vôlei, identificar alvos relevantes o mais rápido possível é essencial para se ter um desempenho magistral. O treinamento melhora as regiões corticais subjacentes à ação sacádica, e permite um processamento mais automatizado em atletas. Objetivo Investigamos as mudanças na latência durante o movimento ocular sacádico e a potência teta absoluta nos córtices frontal e pré-frontal durante a execução da tarefa de movimento ocular sacádico em atletas e não atletas de voleibol. Nossa hipótese é a de que a latência sacádica e a potência teta seriam menores em atletas devido ao treinamento e ao aprimoramento perceptivo-cognitivo em jogadores de voleibol. Métodos Ao todo, 30 voluntários saudáveis foram recrutados para este estudo: 15 atletas de voleibol (11 homens e 4 mulheres; idade média: 15,08 ± 1,06 anos) e 15 não atletas (5 homens e 10 mulheres; idade média: 18,00 ± 1,46 anos). Todas as tarefas foram realizadas simultaneamente com o registro do sinal eletroencefalográfico. Resultados O resultado da latência do movimento ocular sacádico apresentou diferença significativa entre os grupos, sendo observado menor tempo entre os atletas, associado à superioridade dos jogadores em termos de nível de atenção. Durante o experimento, nos eletrodos de cada área frontal e pré-frontal, observou-se uma diminuição na potência teta absoluta nos atletas em comparação aos não atletas. Conclusão Neste estudo, observou-se o comportamento do tempo de reação e da potência teta absoluta em atletas e não atletas durante uma tarefa de movimento sacádico. Nossos achados corroboram a premissa de melhora cognitiva, principalmente pela redução da latência sacádica e menor potência beta, o que valida a hipótese de eficiência neural.

Abstract Amyotrophic lateral sclerosis (ALS) is a complex and serious neurodegenerative disorder that develops in consequence of the progressive loss of the upper and lower motor neurons. Cases of ALS are classified as sporadic (sALS), or familial (fALS). Over 90% of cases are sALS, while roughly 10% are related to inherited genetic mutations (fALS). Approximately 70% of the genetic mutations that contribute to fALS have been identified. On the other hand, the majority of the sALS cases have an undetermined genetic contributor and few mutations have been described, despite the advanced genetic analysis methods. Also, several factors contribute to the onset and progression of ALS. Numerous lines of evidence indicate that epigenetic changes are linked to aging, as well as neurodegenerative disorders, such as ALS. In most cases, they act as the heritable regulation of transcription by DNA methylation, histone modification and expression of noncoding RNAs. Mechanisms involving aberrant DNA methylation could be relevant to human ALS pathobiology and therapeutic targeting. Despite advances in research to find factors associated with ALS and more effective treatments, this disease remains complex and has low patient survival. Here, we provide a narrative review of the role of DNA methylation for this complex neurodegenerative disorder.

SUMMARY OBJECTIVE: The aim was to investigate the acute effect of kinesthetic motor imagery of the 2-minute walk test on hemodynamic and cardiopulmonary variables in patients with heart failure. METHODS: Twenty participants were recruited for the analysis of these variables before and after the execution and imagination of the 2-minute walk test, with the number of laps executed and imagined being recorded. RESULTS: The main results observed showed that (1) there was no difference in the number of laps executed and imagined (p=0.41), indicating that the participants actually imagined the test and (2) the motor imagery of the 2-minute walk test immediately increased (p<0.001) the heart and respiratory rates. CONCLUSION: The motor imagery seems to have acute effects on the cardiopulmonary anticipatory responses of a patient with heart failure.

SUMMARY OBJECTIVE: Use Lead-DBS software to analyze stereotactical surgical outcome of an operated population and demonstrate that small target deviations do not compromise the stimulation of desired structures, even with small amperages. METHODS: Image exams of patients submitted to deep brain stimulation for movement disorders treatment were processed in Lead-DBS software. Electrode stereotactic coordinates were subtracted from the planned target and those deviations, compared among different anatomical targets and sides operated firstly and secondly. We also quantified the frequency of relation between the activated tissue volume and the planned target through computer simulations. RESULTS: None of the 16 electrodes were exactly implanted at the planned coordinates. A stimulation of 3 mA reached 62.5% of the times the planned coordinates, rising to 68.75% with a 3,5 mA. No statistical significance was demonstrated in any comparison of laterality and anatomical sites. CONCLUSIONS: The simulation of small amperage fields could reach the intended target even when electrode placement is suboptimal. Furthermore, such a goal can be achieved without overlapping the volume of activated tissue with undesired structures. Software Lead-DBS proved to be a valuable complementary asset for surgical stereotactical result assessment.

Resumen Introducción: Entre millones de personas que pueden estar infectadas con COVID-19, los pacientes con enfermedad cardiovascular y oncologica exhiben los mayores riesgos de tener peores resultados. Estos pacientes están sujetos a descompensación de enfermedades crónicas y pueden estar sujetos a infección cruzada mientras visitan los centros de salud que atienden a pacientes infectados con COVID-19. Objetivo: Presentar evidencia científica y proponer el uso de la termografía infrarroja para la reducción de infecciones virales cruzadas en instalaciones de salud. Métodos: Ensaio teórico Resultados: La experiencia previa en pandemia muestra resultados favorables con el uso de termografía infrarroja que identifica a pacientes infectados y reduce la posibilidad de infecciones cruzadas. Conclusión: La termografía infrarroja es una tecnología libre de radiación, relativamente barata, sin contacto y no invasiva que podría usarse para el cribado masivo de pacientes y visitantes con fiebre, especialmente en servicios donde los pacientes con enfermedades cardiovasculares buscan atención médica, reduciendo el riesgo de infección cruzada.

Resumo Introdução: Entre milhões de pessoas que podem estar infetadas pelo COVID-19, os pacientes com doenças cardiovasculares e oncológicas apresentam os maiores riscos de ter piores resultados. Esses pacientes estão sujeitos à descompensação crônica da doença e à infeção cruzada enquanto visitam unidades de saúde que cuidam de pacientes infetados com COVID-19. Objetivo: Apresentar as evidências científicas e propor o uso de termografia infravermelha para redução de infeções virais cruzadas em instituições de saúde. Métodos: Ensaio teórico Resultados: Experiências em pandemias prévias sugerem resultados favoráveis com o uso de termografia infravermelha na identificação de pacientes infetados e redução da possibilidade de infeção cruzada. Conclusão: A termografia por infravermelho é uma tecnologia sem radiação, relativamente barata, sem contato e não invasiva que pode ser usada para triagem em massa de pacientes e visitantes com febre, especialmente em serviços onde pacientes com doença cardiovascular buscam atendimento médico, reduzindo o risco de infeção cruzada.

Abstract Introduction: Among millions of people who may be infected with COVID-19, patients with cardiovascular and oncologic diseases exhibit the highest risks of having worse outcomes. These patients are subject to chronic disease decompensation and may be subjected to cross-infection while visiting health facilities that are taking care of COVID-19 infected patients. Objective: To present scientific evidence and propose the use of infrared thermography for the reduction of viral cross-infection in healthcare facilities. Methods: Theoretical essay Results: Previous experience in pandemic show favorable results with the use of infrared thermography identifying infected patients and reducing the possibility of cross infections. Conclusion: Infrared thermography is a radiation-free, relatively inexpensive, noncontact, and noninvasive technology that could be used for mass-screening of patients and visitors with fever, especially in services where patients with cardiovascular disease seek for medical care, reducing the risk of cross-infection.

Resumo Introdução: A imagética motora (IM) representa o componente cognitivo do movimento e recruta os sistemas dopaminérgicos. Objetivo: Investigar o papel do sistema dopaminérgico por meio da ação do metilfenidato e da risperidona sobre a coerência em beta durante a execução, observação de ação e imagética motora. Métodos: Os dados de eletroencefalografia (EEG) foram registrados antes e depois da ingestão das substâncias. Para a análise estatística, uma ANOVA de três vias foi utilizada para identificar mudanças na coerência beta induzidas pelas variáveis grupo, tarefa e momento. A significância estatística foi estabelecida em p≤0,007. Resultados: Encontramos um efeito principal para o grupo C3/CZ e um efeito principal para a tarefa nos pares de eletrodos CZ/C4. Além disso, diferenças significativas foram encontradas após a administração da droga entre os grupos para o par de eletrodos C3/CZ e entre tarefa para o par de eletrodos C4/CZ. Conclusão: A administração de metilfenidato e risperidona foi capaz de produzir alterações eletrocorticais das regiões somatomotoras, mesmo apresentando efeitos antagônicos nas vias dopaminérgicas. Além disso, a tarefa de execução provocou maior modulação da banda beta.

Abstract Background: Motor Imagery (MI) represents the cognitive component of the movement and recruits dopaminergic systems. Objective: To investigate the role of dopaminergic system through the action of methylphenidate and risperidone over beta coherence during execution, action observation and motor imagery. Methods: Electroencephalography (EEG) data were recorded before and after the substance intake. For statistical analysis, a three-way ANOVA was used to identify changes in beta coherence induced by the group, task and the moment variables. Statistical significance was set at p≤0.007. Results: We found a main effect for group for C3/CZ, and a main effect for task for CZ/C4 pairs of electrodes. Furthermore, significant differences were found in the post-drug administration between groups for C3/CZ pair of electrodes, and between task for C4/CZ pair of electrodes. Conclusion: The administration of methylphenidate and risperidone was able to produce electrocortical changes of the cortical central regions, even when featuring antagonistic effects on the dopaminergic pathways. Moreover, the execution task allowed beta-band modulation increase.

Within the framework of the great transformations that have taken place in the agricultural sector in recent decades, this paper analyses the impacts that the expansion of the agribusiness model has had on family agriculture in Argentina and Uruguay. The aim is to describe the particularities and generalities that this phenomenon has had in the region analysed, based on a comparative study emphasizing public policies towards the sector, taking the cases of Argentina and Uruguay as units of analysis. In the study used Statistical sources of official national agencies, intermediate entities and sectoral studies. As variables of analysis were taken: the economic concentration, the composition of the agrarian structure, public intervention

En el marco de las grandes transformaciones que se han desarrollado en el sector agropecuario en las últimas décadas, este trabajo analiza los impactos que a nivel estructura ha tenido la expansión del modelo de agronegocios sobre la agricultura familiar en Argentina y Uruguay. Se busca describir las particularidades y generalidades que ha tenido este fenómeno en la región baja análisis a partir de un estudio comparativo enfatizado las políticas públicas hacia el sector, tomando como unidades de análisis los casos de Argentina y Uruguay. Se utilizaron fuentes estadísticas de organismos nacionales oficiales, entidades intermedias y estudios sectoriales. Como variables de análisis se tomaron: la concentración económica, la composición de la estructura agraria, la intervención pública

RESUMO Há 100 anos três médicos franceses, Guillain, Barré e Strohl descreveram um tipo de polineuropatia aguda ou subaguda de predomínio motor com dissociação albumino-citológica no líquido cefalorraquiano e de evolução benigna. Antes destes, outros autores, como Landry, Duménil, Chomel, Osler e Grainger Stewart, estudaram casos similares, porém não realizaram punção lombar. Neste trabalho procuramos sintetizar alguns fatos importantes no início da descrição desta síndrome.

ABSTRACT A hundred years ago, Guillain, Barré and Strohl described a syndrome with a predominant motor acute or subacute polyneuritis, albumin-cytologic dissociation in the cerebrospinal fluid, and a benign course. Before them, many other authors, such as Landry, Duménil, Osler, and Grainger Stewart had described similar cases although they had not performed lumbar punctures. In this work, we outline certain features of the beginning of this famous syndrome.

RESUMO O objetivo deste estudo foi identificar o gasto energético, retrospectivamente, em indivíduos com síndrome pós-poliomielite (SPP) na população brasileira. Métodos Foi utilizado o questionário Baecke para avaliação da atividade física habitual (AFH) nos pacientes com SPP, sequela de poliomielite (SP) e grupo controle (GC). Participaram do estudo 116 indivíduos (SPP = 52, SP = 28, GC = 36). Resultados Pacientes com SPP tendem a aumentar a AFH dos 10 aos 20 anos, comparados com os grupos SP e GC. No período dos 21 aos 30 anos, houve aumento significativo da atividade física ocupacional do grupo SPP em relação ao grupo SP e a atividade física ocupacional (21-30 anos) correlacionou-se com o aparecimento dos sintomas da SPP. Conclusão Pacientes com SPP apresentam maior gasto de energia durante a vida, especialmente na atividade física ocupacional nas idades 21-30 anos, sugerindo que esta década é crítica para o desenvolvimento da SPP.

ABSTRACT The objective of this study was to identify energy expenditure, retrospectively, in individuals with post-poliomyelitis syndrome (PPS) in the Brazilian population. Methods The Baecke questionnaire for the evaluation of habitual physical activity (HPA), assessment of quality of life (WHOQOL-Bref), and the Fatigue Severity Scale were administered to patients with PPS, poliomyelitis sequelae (PS) and to a control group (CG). Participated in the study 116 individuals (PPS=52,PS= 28,CG=36). Results Patients with PPS tended to increase their HPA from 10 to 20 years of age, compared with those in the PS group and the CG. In the period from 21 to 30 years of age, there was significant increase in the PPS group’s occupational physical activity compared to the PS group, and the occupational physical activity (21-30 years of age) correlated with the onset of symptoms of PPS. Conclusion Patients with PPS had a higher energy expenditure during life, especially in occupational physical activity at ages 21-30 years, suggesting this decade is critical for the development of PPS.

RESUMO Síndrome pós-polio (SPP) é uma condição que afeta sobreviventes da poliomielite aguda (PAA), anos após a recuperação de um ataque agudo inicial do vírus. Na maioria das vezes, os sobreviventes da polio começam a apresentar nova paresia gradual nos músculos que foram previamente afetados pela infecção. A incidência real de doenças cardiovasculares (DCV) em indivíduos que sofrem de SPP não é conhecida. Entretanto, há indícios para suspeitar de que sujeitos com SPP podem estar em maior risco. Método Realizou-se uma busca de artigos nas bases de dados: Bireme, Scielo e Pubmed, utilizando as seguintes palavras-chave: síndrome pós-poliomielite, função cardiorrespiratória e reabilitação, nos idiomas Inglês, Francês e Espanhol. Embora tenhamos selecionado um número expressivo de artigos, somente foram considerados os duplo-cegos, randomizados-controlados, além de consensos. Resultados e Discussão Certas características da SPP, tais como fadiga muscular, paresia, dor muscular e/ou articulares podem resultar em descondicionamento por inatividade física, além de obesidade e dislipidemia. Dificuldades respiratórias são comuns e podem resultar em hipoxemia. Conclusão Somente quando avaliados e tratados em tempo hábil, alguns pacientes são capazes de obter os benefícios do uso dos músculos respiratórios auxiliares em termos de qualidade de vida.

ABSTRACT Post-polio syndrome (PPS) is a condition that affects polio survivors years after recovery from an initial acute attack of the poliomyelitis virus. Most often, polio survivors experience a gradual new weakening in muscles that were previously affected by the polio infection. The actual incidence of cardiovascular diseases (CVDs) in individuals suffering from PPS is not known. However, there is a reason to suspect that individuals with PPS might be at increased risk. Method A search for papers was made in the databases Bireme, Scielo and Pubmed with the following keywords: post polio syndrome, cardiorespiratory and rehabilitation in English, French and Spanish languages. Although we targeted only seek current studies on the topic in question, only the relevant (double-blind, randomized-controlled and consensus articles) were considered. Results and Discussion Certain features of PPS such as generalized fatigue, generalized and specific muscle weakness, joint and/or muscle pain may result in physical inactivity deconditioning obesity and dyslipidemia. Respiratory difficulties are common and may result in hypoxemia. Conclusion Only when evaluated and treated promptly, somE patients can obtain the full benefits of the use of respiratory muscles aids as far as quality of life is concerned.

BACKGROUND: Ballet is a high-performance activity that requires an advanced level of technical skills. Ballet places great stress on tendons, muscles, bones, and joints and may act directly as a trigger of injury by overuse. OBJECTIVES: 1) to describe the main types of injuries and affected areas related to classical ballet and 2) to compare the frequency of musculoskeletal injuries among professional and non-professional ballet dancers, considering possible gender differences among the professional dancers. METHOD: A total of 110 questionnaires were answered by professional and non-professional dancers. The questionnaire contained items related to the presence of injury, the regions involved, and the mechanism of the injury. RESULTS: We observed a high frequency of musculoskeletal injuries, with ankle sprains accounting for 69.8% of injuries in professional dancers and 42.1% in non-professional dancers. Pirouettes were the most frequent mechanism of injury in professional dancers, accounting for 67.9% of injuries, whereas in the non-professional dancers, repetitive movement was the most common mechanism (28.1%). Ankle sprains occurred in 90% of the women's injuries, and muscle sprains occurred in 54.5% of the men's injuries. The most frequent injury location was the ankle joint in both sexes among the professional dancers, with 67.6% in women and 40.9% in men. CONCLUSIONS: The identification of the mechanism of injury and time of practice may contribute to better therapeutic action aimed at the proper function of the dancers' bodies and improved performance by these athletes.

RESUMO Mielopatia associada ao HTLV-1 é uma doença inflamatória, incapacitante e progressiva que acomete o sistema nervoso central. Objetivo Identificar e quantificar os principais músculos comprometidos pela fraqueza e espasticidade, o impacto na capacidade funcional e na qualidade de vida dos pacientes com mielopatia associada ao HTLV-1. Método Força muscular ( Medical Research Council), espasticidade (escala Ashworth modificada), atividades de vida diária (Índice de Barthel) e qualidade de vida ( Short-Form Health Survey-36) foram avaliados em 26 pacientes . Resultados Os principais músculos comprometidos pela fraqueza incluíram os flexores dorsais e flexores do joelho. A espasticidade predominou nos músculos adutores do quadril e nos flexores plantares. Assistência para locomoção, dependência mínima nas atividades diárias, limitações na capacidade funcional e os aspectos físicos representaram os achados mais frequentes. Conclusão Dificuldade de deambulação, dependência funcional e prejuízo na qualidade de vida foram as principais consequências da intensa fraqueza muscular nos pacientes com mielopatia associada ao HTLV-1.

ABSTRACT HTLV-1-associated myelopathy is a progressive disabling disease associated with gait abnormalities. Objective To identify and quantify the main muscles affected by weakness and spasticity, their impact on gait, functional capacity and on quality of life of HTLV-1-associated myelopathy patients. Method We evaluated lower limbs muscular strength according to the Medical Research Council scale, spasticity according to the modified Ashworth scale, daily activities according to the Barthel Index and quality of life according to the Short-Form Health Survey-36 of 26 HTLV-1-associated myelopathy patients. Results The muscles most affected by weakness included the dorsal flexors and knee flexors. Spasticity predominated in the hip adductor muscles and in plantar flexors. Assistance for locomotion, minimal dependence in daily activities, limitations in functional capacity and physical aspects were the most common findings. Conclusion The impairment of gait, functional dependence and quality of life were predominantly a consequence of intense muscle weakness in HTLV-1-associated myelopathy patients.