Do protagonismo como atletas à baixa representatividade como treinadoras: trajetória de desenvolvimento de uma treinadora brasileira expert de taekwondo

O objetivo do estudo foi investigar o desenvolvimento profissional de uma treinadora brasileira expert de taekwondo. Com base na literatura, foi elaborada uma entrevista semiestruturada sobre desenvolvimento de treinadores(as) para a coleta dos dados, os quais foram analisados de acordo com o método de análise de conteúdo utilizando-se a abordagem dedutiva. Além disso, outros temas pertinentes sobre o desenvolvimento da treinadora emergiram de forma indutiva durante a análise dos dados. Os resultados demonstraram que diferentes variáveis contribuíram para o desenvolvimento da treinadora expert de taekwondo, como características pessoais da treinadora, situações de aprendizagem em contexto formal, não-formal e informal e apoio positivo de familiares e amigos(as). Entre os resultados, destaca-se a influência da carreira como atleta de alto rendimento, assim como o conhecimento do idioma inglês, este contribuindo e facilitando a atuação da treinadora durante competições internacionais. Em conclusão, o presente estudo fornece informações valiosas sobre a escassez de treinadoras experts no taekwondo brasileiro, o que pode ter implicações significativas para o desenvolvimento da modalidade e para a promoção da igualdade de gênero no esporte

The influence of technical skills on decision making of novice volleyball players

The aim of this study was to verify the influence of the technical skills level on the decision making of novice volleyball players on service, reception and set actions. The sample was composed of 80 novice athletes of school volleyball teams of both sexes. Based on the results from the Volleyball Skills Test Battery, the sample was divided into three groups: low, intermediate and high technical level, by means of One-Way ANOVA. The intermediate group was excluded from further analyses. Decision making was assessed with the Game Performance Assessment Instrument (GPAI). For data analysis purposes, the independent student-t test was used, adopting significance level of p≤0.05. The results showed that players with low skill level in service and set actions also had lower performance on the decision-making test when compared to players with high technical level. On the other hand, in the reception action, no differences were found among groups. It was therefore concluded that the technical level seems to influence the decision making in service and set actions in novice volleyball players.O estudo objetivou verificar a influência do nível da habilidade técnica na tomada de decisão de jogadores iniciantes de voleibol nas ações de saque, recepção e levantamento. A amostra foi composta por 80 atletas iniciantes de equipes escolares de voleibol de ambos os sexos. Com base nos resultados na Bateria de Testes de Habilidades de Voleibol, a amostra foi dividida em três grupos: baixo, intermediário e alto nível técnico, por meio da ANOVA One Way. O grupo intermediário foi excluído das análises posteriores. A tomada de decisão foi avaliada por meio do Game Performance Assessment Instrument (GPAI). Utilizou-se o teste t student independente para análise dos dados, adotando um nível de significância de p≤0,05. Os resultados encontrados demonstraram que os jogadores com baixo nível de habilidade nas ações de saque e levantamento, também obtiveram um pior desempenho no teste de tomada de decisão quando comparado aos jogadores de alto nível técnico. Por outro lado, na ação de recepção, não foram encontradas diferenças significativas entre os grupos. Conclui-se que o nível técnico parece influenciar na tomada de decisão na ação de saque e levantamento dos jogadores iniciantes de voleibol

Non-invasive brain stimulation over the orbital prefrontal cortex maintains endurance performance in mentally fatigued swimmers

Background: Using anodal transcranial direct current stimulation (a-tDCS) on frontal brain areas might be a promising strategy to mitigates mental fatigue and maintain endurance performance swimmers. Objective: The objective was to analyze the effect of a-tDCS over the orbital prefrontal cortex (oPFC) on endurance performance of mentally fatigued female amateur swimmer. Methods: Nineteen female amateur swimmers participated in this study. In two experimental visits, the swimmers completed the 3-min all-out tethered swimming after performing a 30-min Stroop test with a-tDCS or placebo (Sham) stimulation over the left-oPFC. The brain stimulation conditions (i.e., a-tDCS and Sham) were performed in a double-blinded and counterbalanced order. Results: It was found lower critical force, mean force, force minimum, fatigue index, and aerobic impulse for Sham than a-tDCS (p < 0.05). There was no main effect of condition for peak force (p > 0.05). Conclusion: We concluded that a-tDCS applied over the left-oPFC in female amateur swimmers mentally fatigued maintained endurance performance. From a practical point of view, the use of a-tDCS should be considered to counteract harmful cognitive effects and maintain endurance performance during competitive race events

Proposta para uma nova versão brasileira de seis itens da Escala de Depressão Pós-Parto de Edimburgo

Introdução: a análise fatorial da Escala de Depressão Pós-Parto de Edimburgo (Edinburgh Postnatal Depression Scale, EPDS) poderia resultar em uma ferramenta de triagem mais curta e mais fácil de aplicar. Portanto, o objetivo deste estudo foi verificar e comparar as métricas de duas subescalas EPDS de 6 itens. Métodos: administramos a EPDS a um total de 3.891 mulheres que deram à luz entre 1 e 3 meses antes da aplicação. Foram realizadas análises fatoriais confirmatórias e exploratórias e geradas curvas ROC (receiver-operating characteristics) para determinar, respectivamente, a validade do construto, o ajuste dos itens da escala aos dados, e os pontos de corte ideais para as versões curtas. Resultados: a escala de 6 itens previamente publicada não apresentou validade de construto para nossa amostra. No entanto, utilizamos a análise fatorial exploratória para derivar uma nova escala de 6 itens, que apresentou boa validade de construto. A área sob a curva ROC da nova escala de 6 itens foi 0,986, e o ponto de corte ideal foi ≥ 6. Conclusão: a nova escala de 6 itens possui propriedades psicométricas adequadas e valores de curva ROC semelhantes à versão de 10 itens e oferece um meio de reduzir o custo e o tempo necessário para administrar o instrumento.Introduction: factor analysis of the Edinburgh Postnatal Depression Scale (EPDS) could result in a shorter and easier to handle screening tool. Therefore, the aim of this study was to check and compare the metrics of two different 6-item EPDS subscales. Methods: we administered the EPDS to a total of 3,891 women who had given birth between 1 and 3 months previously. We conducted confirmatory and exploratory factor analyses and plotted receiver-operating characteristics (ROC) curves to, respectively, determine construct validity, scale items' fit to the data, and ideal cutoff scores for the short versions. Results: a previously defined 6-item scale did not exhibit construct validity for our sample. Nevertheless, we used exploratory factor analysis to derive a new 6-item scale with very good construct validity. The area under the ROC curve of the new 6-item scale was 0.986 and the ideal cutoff score was ≥ 6. Conclusions: the new 6-item scale has adequate psychometric properties and similar ROC curve values to the10-item version and offers a means of reducing the cost and time taken to administer the instrument

Sensorimotor performance in euthymic bipolar disorder: the MPraxis (PennCNP) analysis

Sensorimotor deficits are an important phenomenological facet observed in patients with bipolar disorder (BD). However, there is little research on this topic. We hypothesize that the MPraxis test can be used to screen for motor impairments in BD aiming movements. The MPraxis, which is a quick and easy-to-apply computerized test, measures sensorimotor control. During the test, the participant must move the computer mouse cursor over an ever-shrinking green box and click on it once. We predict that the MPraxis test is capable of detecting differences in sensorimotor performance between patients with BD and controls. We assessed 21 euthymic type I BD patients, without DSM-IV-TR Axis I comorbidity, and 21 healthy controls. Compared to the controls, the patients with BD presented a lower response time in their movements in all conditions. Our results showed sensorimotor deficits in BD and suggested that the MPraxis test can be used to screen for motor impairments in patients with euthymic BD

Association between inhibitory control and tactical performance of under-15 soccer players

Este estudio tiene como objetivo investigar la inuencia la asociación entre el control inhibitorio y el rendimiento táctico de jugadores de fútbol menores de 15 años; por tanto se analizaron los datos de 166 jugadores. Para evaluar el desempeño táctico y el control inhibitorio se utilizó el Sistema de evaluación táctica en futbol (FUT-SAT) y el Conners Continuous Performance Test (CPT-II) respectivamente. El desempeño de los jugadores en FUT-SAT eran dividieron en tres niveles: bajo, intermedio y alto. Valores del número de errores de la comisión, número de errores de la omisión y tiempo de reacción de los jugadores de los grupos con bajos y altos desempeño táctico fue comparado por la prueba no-paramétrica de Mann-Whitney. Los resultados revelaron que los jugadores com altos niveles de desempeño táctico presentaron valores más bajos de Tiempo de Reacción (Z = - 2.569; p = 0.010; r = -0.35). Estos resultados sugieren que los jugadores con un mejor rendimiento táctico presentan una mejor capacidad para responder más rápido en una tarea de control inhibitorio.This study aimed to investigate the association between inhibitory control and tactical performance of under-15 soccer players. Data from 166 under-15 soccer players were analyzed. The tactical performance and the inhibitory control were assessed by the System of Tactical Assessment in Soccer (FUT-SAT) and by Conners Continuous Performance Test 2nd version (CPT-II), respectively. The scores of the tactical performance achieved by players in FUT-SAT were separated into three levels: low, intermediate and high. Values of Number of Commission Errors, Number of Omission Errors and Hit Reaction Time of CPT-II achieved by the players from low and high groups in tactical performance were compared by the non-parametric Mann-Whitney test. Results revealed that players with high scores in tactical performance presented lower values of Hit Reaction Time (Z = - 2.569; p = 0.010; r = -0.35). These results suggest that players with better tacticalperformance presented a better ability to respond faster in an inhibitory control task.Este estudo teve como objetivo investigar a associação entre o controle inibitório e o desempenho táctico de jogadores de futebol com menos de 15 anos. Dados de 166 jogadores de futebol com menos de 15 anos foram analisados. O desempenho tático e o controle inibitório foram avaliados pelo Sistema de Avaliação Tática no Futebol (FUT-SAT) e pelo Teste de Desempenho Contínuo 2ª versão (CPT-II), respectivamente. Os escores do desempenho tático obtidos pelos jogadores no FUT-SAT foram separados em três níveis: baixo, intermediário e alto. Os valores do Número de Erros de Comissão, Número de Erros de Omissão e Tempo de Reação de Acerto do CPT-II alcançados pelos jogadores dos grupos baixo e alto no desempenho tático foram comparados pelo teste não-paramétrico de Mann-Whitney. Os resultados revelaram que os jogadores com altas pontuações no desempenho tático apresentaram menores valores de Tempo de Reação da Batida (Z = - 2,569; p = 0,010; r = -0,35). Estes resultados sugerem que os jogadores com melhor desempenho tático apresentaram uma melhor capacidade de responder mais rapidamente em uma tarefa de controle inibitório

Effects of self-controlled knowledge of results in motor learning

O objetivo do presente estudo foi analisar três diferentes estratégias de fornecer conhecimento de resultados (CR): autocontrolado, yoked pareado por tentativa e yoked pareado pela frequência média total de CR, na prática aleatória. A amostra foi constituída por 45 voluntários universitários, distribuídos em três grupos (n= 15 sujeitos). A tarefa consistiu em pressionar as teclas 2, 4, 8 e 6 do teclado numérico de um computador, em três diferentes tempos alvo (700, 900 e 1100 ms), praticados aleatoriamente. O experimento constou de fase de aquisição e testes de retenção e transferência atrasados. A análise dos dados foi realizada por meio da ANOVA e não foi constatada diferença significativa entre os grupos. Os resultados demonstraram que não houve efeito das frequências autocontroladas para a aprendizagem motora quando se utiliza a prática aleatória. Além disso, uma nova possibilidade de parear o grupo autocontrolado foi apresentada.The purpose of this study was to examine three different strategies to provide knowledge of results (KR), yoked paired by trial and yoked paired by average of total frequency of KR in random practice. The sample was composed by 45 volunteers, distributed into three groups (n=15 subjects). The task consisted of press three keys, 2, 4, 8 and 6 in the numeric keypad of the computer in three different total time (700, 900 and 1100 ms) in random practice. The experiment consisted of acquisition phase and delay retention and transfer test. The data analysis was conducted by ANOVA and the results were not demonstrated difference between groups. The results showed no effect of self-controlled frequency of KR to the motor learning when using random practice. In addition, a new possibility to be used the yoked group was presented

Effects of different exercise programs and minimal detectable changes in hemoglobin A1c in patients with type 2 diabetes

The incidence of diabetes mellitus is increasing worldwide, resulting in a global epidemic. The most common type, the type 2 diabetes mellitus, constitutes of 90–95 % of the cases and is characterized by the action of and/or impaired insulin secretion. Regular exercise is a recommended strategy in several studies and guidelines for type 2 diabetes control and complications associated with it. Therefore, we evaluated and compared the effects of aerobic and strength exercise programs on the glycemic control in patients with type 2 diabetes. The selected patients were divided into groups which performed moderate strength training (ST) and aerobic training (AT). The study lasted 20 weeks and was divided into two 10 week phases with anthropometric (body mass index, waist, abdomen and hips circumferences, waist/hip ratio) and biochemical (glycemic and lipid profile) assessments at baseline, 10 weeks and 20 weeks. For intra and inter analyses a mixed ANOVA model was used. Individual changes were calculated using the minimum detectable change, based on a 90 % confidence interval. Eleven patients (five men and six women) completed the 20 weeks of training; five from the ST group and six from the AT. No significant changes were observed in any anthropometric variable in either group. Statistically significant differences were found in mean hemoglobin A1c in both groups between baseline (AT: 8.6 ± 2.5; ST: 9.2 ± 1.9) and 10 weeks (AT: 7.2 ± 1.7; ST: 7.9 ± 1.2) (p = 0.03), and baseline (AT: 8.6 ± 2.5; ST: 9.2 ± 1.9) and 20 weeks (AT: 7.5 ± 1.7; ST: 7.4 ± 0.9) (p = 0.01). For the minimal detectable changes, 40 % of the ST and 33 % of AT achieved these changes for hemoglobin A1c. Both aerobic and strength exercises can help the metabolic control in patients with type 2 diabetes, even without significant changes in anthropometry over the 20 weeks of training. However, this period was sufficient to cause changes in hemoglobin A1c values and the estimated average glucose, which are important parameters in controlling diabetes, thus signaling an important consequence of adhering to an exercise routine for type 2 diabetic patients

No acute effect of whole-body vibration on Roundhouse kick and countermovement jump performance of competitive Taekwondo athletes

Little is known about the effect of whole body vibration (WBV) has on specific sports action such as taekwondo kicking technique.  Fifteen  individuals (10 males and 5 females; 18.6 ± 2.1 years), performed two experimental protocols on separate days: A) 1 minute exposure at 26 Hz frequency of WBV followed by countermovement jump (CMJ) test; B) 1 minute exposure at 26 Hz frequency of WBV followed by kick test. A Student’s t-Test analysis was performed to evaluate the difference between performance before and after vibration intervention. The CMJ height means (cm) were 34.1 ± 6.4 before and 34.2 ± 6.5 after WBV exposure. The CMJ maximal force means were 1582.6 ± 214.3 before WBV and 1595.7 ± 205.0 after WBV, while Impulse means (N.s) were 283.3 ± 48.6 before WBV and 282.6 ± 46.6 after WBV. The kick time means (ms) were 219.9±20.31 before WBV and 218.9±19.81 after WBV. No significant differences were found regarding the application of mechanical vibration for all variables. Thus, the vibration intervention (1 minute of WBV at 26 Hz and 6 mm) adopted in this present study may have not been substantial to improve Roundhouse kick time (p=0.73), jump height (p=0.80), maximal force (p=0.78) and impulse (p=0.38) of taekwondo athletes. Future studies should investigate new vibration protocols (amplitude, frequency) and training (intensity, exercise, duration) to determine optimal parameters

Bad Choices Make Good Stories: The Impaired Decision-Making Process and Skin Conductance Response in Subjects With Smartphone Addiction

Introduction: Smartphone Addiction (SA) has caused negative consequences and functional impairments in college students, such as reduction of academic performance and impairment in sleep quality. Studies have shown that individuals with chemical and behavioral dependencies have a bias in decision-making process, which leads to short-term advantageous choices even if they cause long-term harm. This bias in decision-making process is accompanied by a change in somatic markers and is associated with the development and maintenance of addictive behavior. The decision-making process and the measurement of physiological parameters have not yet been analyzed in SA. The neuropsychological and physiological characterization of the SA can contribute to its approach with the other dependency syndromes and to its recognition as a disease.Objective: we aimed to evaluate the decision-making process under risk and under ambiguity in individuals with SA and to measure the physiological parameters that accompany this process.Method: We compared the performance in the Iowa Gambling Task (IGT), Game of Dice Task (GDT) and skin conductance response (SCR) between 50 individuals with SA and 50 controls.Results: Smartphone dependents presented a profile of impairment in decision-making under ambiguity, without impairment in decision-making under risk. They demonstrated lower SCR before disadvantageous choices, higher SCR after rewards and lower SCR after punishments during decision-making, which suggests difficulty in recognizing disadvantageous alternatives, high sensitivity to rewards, and low sensitivity to punishments.Conclusion: The impairment in the decision-making process in smartphone dependents is similar to that found in other chemical and behavioral addictions, such as alcohol addiction, gambling disorders and pathological buy. The impairment in decision under ambiguity with preservation of decision under risk may reflect dysfunction of implicit emotional processes without dysfunction of explicit cognitive process. This profile can contribute to the recognition of SA as a behavioral dependence and to guide specific preventive and therapeutic strategies