Assessment of a karate performer's position estimation system without any markers.

Karate has become more popular, and researches have been conducted on training methods and motion analysis related to karate. The AR system for karate is an effective system for training and for the audience to understand the performance. To develop the AR system, it is necessary to acquire the movement of the performer. The purpose of the research is to assess a motion capture system to estimate a karate performer's full-body position and posture from HoloLens 2, without wearing any attachments. We used ThreeDPoseUnityBarracuda to estimate the position and posture of the performer's joints. In the experiment, the estimated joint's positions were compared with actual positions using the inertial three-dimensional motion capture. As results, although the error increased when the performer's movement was large, the median error between the estimated and actual positions was a maximum of 0.24 m at the x-coordinate of the right hand, and high accuracy was obtained when the performer's movement was small.

Pressure Sensors for Measuring the Grip Pressure during Kendo Attacks: Assessment of Laterality and Evidence of the Five Phases of Attack.

In Kendo, there is no consensus as to which hand should produce more pressure when attacking the opponent with the bamboo sword, let alone how to teach the pressure distribution during coaching. There is the theory that a Kendo attack can be divided into five phases, which has not entered the coaching practice, either. The aim of this study was to measure the grip pressure during Kendo attacks, investigate the pressure distribution between the two hands, and find evidence for the existence of the alleged five attack phases. We instrumented a bamboo sword with grip pressure sensors and investigated the grip pressure in 23 participants. In all attack targets and in both hands, the pressure across all attack phases was significantly different. In general, the left-hand pressure was consistently and significantly higher than the right-hand one, across all five attack phases, for the hand, head, and flank attack targets. The surprising exception was the throat target with only two attack phases, the strike phase of which showed a greater pressure in the right hand. Across all participants, the left-hand pressure was greater in 60.22-100% in any phase of the four attack targets, except for the strike phase of the throat target. Through these results, we could verify the effect of the teaching customs in Kendo, as well as provide first-time evidence of the existence of the five attack phases.

Self-Assessment of Physical Fitness and Health versus Motivational Value of Physical Activity Goals in People Practicing Fitness, Football, Martial Arts and Wheelchair Rugby.

The aim of the study was to determine the relationship between self-assessment of physical fitness and health, and the motivational role of physical activity goals in people, depending on their sports discipline. The study included 470 men and 218 women, aged 18-45, from western and southern Poland. The respondents practiced sports recreationally (fitness-F), competitively (football-FB, martial arts-MA), and for rehabilitation and sports purposes (wheelchair rugby-R). The standardized questionnaire for the motivational role of physical activity goals (Inventory of Physical Activity Objectives, IPAO) by Lipowski and Zaleski and the authors' questionnaire on lifestyle were used. In the statistical analyses, non-parametric statistics were used. Individuals with very high and high self-assessment of their physical fitness and very good self-assessment of health achieved higher scores on the motivational value scale, time management, motivational conflict and multidimensionality of physical activity goals (p < 0.05). Respondents who assessed their health as very good achieved lower results on the perseverance scale, compared to those who assessed their health as good or poor. Self-assessment of physical fitness had a positive, high and moderate correlation with the self-assessment of health in people practicing wheelchair rugby, fitness, football and martial arts (r = 0.61; r = 0.52; r = 0.41; r = 0.40, respectively). Correlations were found between the motivational role and time management in people practicing fitness (r = 0.81), football (r = 0.66) and martial arts (r = 0.45), and multidimensionality of goals in those practicing fitness (r = 0.65) and martial arts (r = 0.42) Wheelchair rugby players scored the highest on all KCAF scales (except for motivational conflict). Self-assessment of physical fitness of wheelchair rugby players and fitness practitioners was negatively correlated with time management (r = -0.68; r = -0.49), multidimensionality of goals (r = -0.51; r = -0.49) and motivational values (r = -0.43; r = -0.43). The demonstrated relationships indicated that there was a need to strengthen the self-esteem and motivation for physical activity, promoting perseverance, the ability to focus on the implementation of one's goals and prioritizing the goals among people practicing various sports disciplines.

Assessment of the Relevance and Reliability of Reaction Time Tests Performed in Immersive Virtual Reality by Mixed Martial Arts Fighters.

Immersive virtual reality (VR) is increasingly applied in various areas of life. The potential of this technology has also been noticed in recreational physical activity and sports. It appears that a virtual environment can also be used in diagnosing certain psychomotor abilities. The main aim of this study consisted of assessing the relevance and reliability of VR-implemented tests of simple and complex reaction time (RT) performed by mixed martial arts (MMA) fighters. Thirty-two professional MMA fighters were tested. The original test developed in the virtual environment was applied for RT assessment. The fighters' task consisted of reacting to the lighting up of a virtual disc situated in front of them by pushing a controller button. The relevance of the test task was estimated by juxtaposing the obtained results with the classic computer test used for measuring simple and complex reactions, while its reliability was assessed with the intraclass correlation procedure. Significant relationships found between the results of VR-implemented tests and computer-based tests confirmed the relevance of the new tool for the assessment of simple and complex RT. In the context of their reliability, RT tests in VR do not differ from tests conducted with the use of standard computer-based tools. VR technology enables the creation of tools that are useful in diagnosing psychomotor abilities. Reaction time tests performed by MMA fighters with the use of VR can be considered relevant, and their reliability is similar to the reliability obtained in computer-based tests.

Chaos Adaptive Particle Swarm for Physical Exercise Health Assessment.

Particle crowd algorithmic rule is a mayor examination hotspot in the authentic optimization algorithmic rule respond. Based on the PSO algorithmic rule to make optimal the RBFNN example, an amended order of nonlinear adaptable laziness power supported on the contest of population variegation is intended to extend the fixedness of population unlikeness performance and hunt capabilities to preclude the algorithmic rule from dripping into a topical extreme point prematurely, thereby further improving the prophecy correctness. Simulation experience shows that the amended PSO-RBFNN standard has open advantageous in the fixedness and sharp convergency of the prognosis proceed. In fashion to reprove the justness of reverse kinematics of robots with composite make and supercilious degrees of liberty, an amended adaptative suffix abound optimization (IAPSO) is spoken. First, the motoric equality of the 6-DOF strength-example avaricious robot design is established by the amended DH (Denavit-Hartenberg) argument course; second, on the base of the existent morsel abound algorithmic rule, the population Manhattan ceremoniousness is interested to lead the maneuver condition of the population in aqiqiy measure. And bound the adaptative lore substitute accordingly to the dissimilar maneuver possession and then adopt distinct site and hurry update modes; lastly, the fitness province with handicap substitute is present to trial the honest-prick and extended course transposition of the robot mold, and the delusion is not joint product major than 0.005 rad. The feint inference shows that the established kinematics shape is chasten, and the amended algorithmic program captures into recital the nicety, uniqueness, and velocity of the inverted resolution of the existent PSO algorithmic program, as well as higher deliverance truths. We conduct an experiment on the Brazilian jiu-jitsu. The results have clearly shown the advantage of our method.

Assessment of Visual Function and Performance in Paralympic Judo for Athletes with Vision Impairment.

SIGNIFICANCE: Paralympic judo currently requires all athletes to compete against each other in one class irrespective of their level of vision impairment (VI). Recent evidence suggests that multiple classes are required to enhance fairness, yet it remains unclear how many classes are necessary and what vision tests should be used to define those classes. PURPOSE: The aim of this study was to quantify the relationship between vision and performance in judo for individuals with VI. The results were expected to inform the development of evidence-based criteria to structure Paralympic judo competition. METHODS: The visual function of 53 elite VI judokas was assessed using a test battery that included tests of visual acuity (VA), contrast sensitivity, light sensitivity, depth perception, motion perception, visual search, and central visual field. Performance was assessed by measuring the ratio of fights won across all competitions the participants took part in in the 2 years before and after vision testing. Pearson correlation coefficients and decision tree analyses were used to determine the relationship between vision and performance. Partial correlations were also conducted to determine the unique ability of each measure of visual function to predict judo performance. RESULTS: Visual acuity was the best predictor of judo performance and remained the only visual function related to performance when controlling for correlations between VA and other visual functions. Decision tree analyses suggested to split athletes into two groups for more legitimate competition, using a cutoff point around 2.6 logMAR. Within each of the two resulting subgroups, no correlations remained between any of the visual functions and performance. CONCLUSIONS: The results of this study suggest that VI judo competition should be split into separate categories for partially sighted and functionally blind athletes. The inclusion of visual functions in addition to VA does not improve the ability to predict performance in VI judo.

A capoeira na capital do estado de Rondônia: da quantidade de grupos à participação do profissional de educação física / Capoeira in the capital of the state of Rondônia: from the quantity of groups to the participation of the physical education professional

A capoeira é uma prática corporal e cultural afro-brasileira que contempla configurações e gestuais característicos. É sinônimo de resistência cultural e esteve presente em diferentes momentos da história do Brasil, sendo elemento marcante na formação da identidade de povo brasileiro. Apesar de sua popularidade, assim como a maioria das tradições de origem africana e/ou afrodescendente, permanece marginalizada em muitas regiões do país e carece de investigações científicas a seu respeito. O presente estudo teve como objetivo investigar e descrever a realidade da capoeira na cidade de Porto Velho, capital do estado de Rondônia. no que diz respeito: a) ao número de grupos e seu público-alvo, b) à organização destes através de Federação ou associação; e c) à participação do profissional de Educação Física (EDF). Trata-se de uma pesquisa de caráter qualitativo, observacional e descritivo. Para sua realização foram feitas entrevistas semiestruturadas com quatro professo res/mestres de capoeira. A pesquisa evidenciou que na cidade de Porto Velho não é possível definir com exatidão o número de grupos existentes; sendo 15 o total estimado. Crianças e adolescentes são seu público-alvo. Somente um grupo tinha professor de capoeira graduado em EDF responsável por ministrar aulas. Quanto aos mestres, apenas um grupo possuía mestre graduado em EDF. Portanto, apesar de ser um campo de atuação oportuno ao profissional de EDF, a participação deste na capoeira da cidade de Porto Velho é pequena, quase inexistente. Acredita -se que a graduação em Educação Física poderia somar ao planejamento, entendimento de prevenção de lesões, bem como na estruturação das aulas. De outra forma, o trabalho conjunto entre professores de capoeira e profissionais de EDF, realidade identificada na presente pesquisa, também se apresenta como uma alternativa potencialmente interessante....(AU)

Capoeira is an Afro-Brazilian corporal and cultural practice that includes characteristic configurations and gestures. It is synonymous with cultural resistance and has been present at different times in the history of Brazil, bein g an im p ortan t element in t he formation of the identity of the Brazilian people. Despite its popularity, as well as most traditions of African origin and/or African descent, it remains marginalized in many regions of the country and scientific research on it is lacking. This study aimed to investigate and describe the reality of capoeira in the city of Porto Velho, capital of the state of Rondônia with respect to: a) the n um ber o f gro up s and t h eir t arget audience; b) their organization through Federation or association; and c) the participation of the Physical Education (PE) professionals. This is a qualitative, observational and descriptive study. Semi-structured interviews were carried out with four capoeira teachers/m asters. This study showed that in the city of Porto Velho it is not possible to define exactly the number of existing groups; 15 being the estimated t otal. Children and teenagers are their target audience. Only one group had a capoeira teacher graduated in PE responsible for teaching classes. As for the masters, only one group had a master graduated in PE. Therefore, despite being an opportune field of activity for PE profession als, their participation in capoeira in the city of Porto Velho is small, almost nonexistent. It is believed that graduation in P h ysical Education could add to planning, understanding injury prevention, as well as structuring classes. Furthermore, joint work between capoeira teachers and PE professionals, a reality identified in this study, also presents itself as a potentially interesting alternative....(AU)

"a gente tem que somar": fontes de captação financeira de atletas da seleção brasileira de judô / "we have to add": funding sources for athletes of brazil's national judo team / "tenemos que sumar": fuentes de captación financiera de los deportistas de la selección brasileña de judo

Resumo O judô é um esporte em destaque no Brasil. Um dos motivos para isso é o suporte financeiro que o país oferta. Por conta disso, este trabalho objetivou descrever e analisar as formas de captação de recursos financeiros dos atletas de ponta do judô e detalhar a utilização do Programa Bolsa Atleta em suas carreiras. Foram entrevistados 17 atletas da seleção brasileira de judô. Geralmente, os atletas se beneficiam de quatro fontes de recursos financeiros - clube, patrocínios individuais, Programa de Atletas do Alto Rendimento (PAAR) e Programa Bolsa Atleta. Além disso, a Confederação Brasileira de Judô (CBJ) auxilia com outros recursos. Concluiu-se, então, que as principais fontes de financiamento dos atletas vêm do governo federal. É possível se manter financeiramente como atleta de alto rendimento, contudo, há um déficit no financiamento de judocas de base, falta de suporte para recuperação de lesões e para o pós-carreira do atleta.

Abstract Judo is a prominent sport in Brazil, partly as a result of government-provided financial support. This work describes and analyzes top judo athletes' fundraising strategies and the uses they make of the Athlete Scholarship Program in their careers. Seventeen athletes from Brazil's national judo team were interviewed. Athletes usually benefit from four funding sources - clubs, individual sponsors, the High-Performance Athletes Program (PAAR), and the Athlete Scholarship Program. In addition, the Brazilian Judo Confederation (CBJ) assists with other resources. The study concludes that the main funding sources for athletes are provided by the federal government. High performance athletes are able support themselves, but lower-level athletes are underfunded and lack support to recover from injuries and for their post-career times.

Resumen El judo es un deporte destacado en Brasil, y una de las razones de esto es el apoyo financiero que ofrece el país. Por eso, este trabajo tuvo como objetivo describir y analizar las formas de captación de recursos económicos de los deportistas de élite del judo, y detalla la utilización del Programa Bolsa Atleta (Beca Atleta) en sus carreras. Fueron entrevistados 17 deportistas de la selección brasileña de judo. Generalmente, los deportistas se benefician de cuatro fuentes de recursos financieros: club, patrocinios individuales, Programa de Atletas de Alto Rendimiento (PAAR) y Programa Bolsa-Atleta. Además, la Confederación Brasileña de Judo (CBJ) colabora con otros recursos. Se concluyó que las principales fuentes de financiación de los deportistas provienen del gobierno federal. Es posible mantenerse económicamente como deportista de alto rendimiento, sin embargo, existe un déficit en la financiación de los judokas de base, falta de apoyo para la recuperación de lesiones y para la poscarrera del deportista.

Hormonal reactivity during martial arts practice among high-risk youths.

Martial arts have become a popular afterschool activity for youths across the globe. Accumulating data suggest that these activities may confer substantial cognitive and psychological benefits, and recent efforts have been made to introduce martial arts training into educational and rehabilitation settings. However, few studies have examined the potential mechanisms that may underlie these benefits. The current study evaluated the reactivity of two hormones, oxytocin (OT) and cortisol (CT), thought to be respectively involved in regulating mammalian social behaviors and responsivity to stress, to a session of intensive martial arts training in samples of at high-risk and low-risk (in regular educational establishments) youths. OT and CT were measured at baseline, during peak training, and following a cool down period. Analyses revealed that high-risk youths had lower OT but similar CT baseline levels, compared to low-risk youths, prior to the martial arts session. A significant group by time interaction indicated that whereas the OT levels among low-risk youths returned to baseline levels following training, OT levels among high-risk youths remained elevated. Finally, unlike low-risk youths for whom CT levels continued to increase throughout the training session, high-risk youths showed no significant CT reactivity. This study suggests that some of the beneficial effects of martial arts may be related to hormonal processes, especially increases in OT levels, and highlights the differing effects that training may have in different populations.

Risk assessment in different Judo techniques for children and adolescent athletes.

Judo is a combat sport that involves throwing the opponent onto the back. When being thrown, head biomechanics may be related to head injury risk. This study aimed to assess head injury risks associated with four Judo techniques in children and adolescents with different experience levels. Twenty children (<12 years) and 20 adolescents (≥ 12 years) judoka were recruited. Each group was divided into non-expert and expert. Two inertial sensors were fixed on fallers' head and torso. Two backward (o-soto-gari and o-uchi-gari) and two forward (ippon-seoi-nage and tai-otoshi) techniques were performed. Peak of linear and angular head acceleration magnitude, impact time duration, neck angle, and the Gadd Severity Index were assessed. Children did not show differences between techniques or experience levels. In contrast, adolescents showed greater linear acceleration peak in o-soto-gari than tai-otoshi (p = 0.03), greater angular acceleration peak in o-soto-gari and o-uchi-gari than ippon-seoi-nage (p < 0.05), and greater neck flexion in o-uchi-gari than ippon-seoi-nage (p = 0.004). Compared to expert adolescents, non-expert adolescents showed greater angular acceleration peak, impact duration, and the Gadd Severity Index in o-soto-gari (p < 0.05) and greater neck extension in o-uchi-gari (p = 0.02). Current results pointed out higher risks for adolescents judoka while being thrown with backward techniques, especially for non-expert participants. This study highlights the need of training athletes in controlling head and neck during back falls from a young age to become expert judoka in adulthood.

Dynamics of cognitive performance at rest and after exhaustive exercise in top-three world-ranked mixed martial arts athletes: a series of case studies.

Cognitive performance plays a key role in sports performance, especially in combat sports such as mixed martial arts (MMA). Studies with active and sedentary individuals showed either no change or decreased cognitive performance during or immediately after exercise. However, it is possible that elite MMA athletes would present preserved/improved cognitive performance after exhaustive exercise. In this series of cases studies, we tested this hypothesis by submitting three elite MMA athletes from the Bellator MMA® and UFC® to a cognitive assessment before, immediately after and 15 min after exhaustive exercise. A modified computerized version of the Stroop Test was used to test cognitive inhibition performance, from which reaction time (RT) and accuracy were obtained. The athletes performed an incremental exercise on a cycle simulator until volitional exhaustion. Immediately after exercise RT improved consistently in all three athletes (-6.5%; -8.0%; -15.0%), while accuracy presented a small increase (2.6%), decreases (-3.8%) or no change. Fifteen minutes after exercise, RT remained improved in two athletes (-9.1% and -15.5) or slightly increased (0.4%), while accuracy presented small increase in all athletes (0.5%; 1.3%; 2.1%) compared to pre-exercise. This result indicates that elite MMA athletes may present improved cognitive performance immediately after exhaustive exercise, which suggests that cognitive-motor training for MMA should be considered when planning a training program.

Dupla carreira: dilemas entre esporte e escola / Dual career: dilemmas between sport and school

RESUMO Este artigo analisa os modelos de conciliação das rotinas na dupla carreira, esportiva e escolar, no Programa Bolsa Atleta do Governo Federal, com estudantes-atletas contemplados pelos resultados obtidos no ano de 2011. Caracteriza-se como uma pesquisa quantitativa realizada por meio de uma entrevista estruturada aplicada a 131 atletas das modalidades de atletismo, judô e natação, sendo 64 do sexo feminino e 67 do masculino. Os resultados evidenciam que: 1) as diferentes modalidades esportivas exigem dos seus atletas tempo e dedicação distintos; 2) processo de iniciação nas três modalidades exigem diferentes formas de investimentos; 3) menor escolaridade dos pais e atletas do atletismo, assim como, classe social mais baixa. Diante dos obstáculos da dupla carreira, atletas, clube, escola e famílias passam adotar táticas de conciliação e mesmo burla dos programas de suporte à formação esportiva.

ABSTRACT This article discusses the models for the reconciliation of career, sports and school routines in the Federal Government Athletic Scholarship Program, with students-contemplators and results obtained in 2011. Characterization as a quantitative research carried out by means of a structured interview invested in 131 athletes of the modalities of athletics, judo and swimming, being 64 female and 67 male. They show the following results: 1) as different sports modalities; 2) initiation process in the temporary variables of the forms of investment; 3) lower schooling of parents and athletes in athletics, as well as lower social class. In the face of the obstacles of the dual career, athletes, clubs, schools and families are adopting tactics of conciliation and even mockery of programs to support sports training.

Jogos escolares da rede pública do estado da bahia: análise das edições 2009 a 2017 / Bahia state public schools championship: analysis of editions from 2009 to 2017

RESUMO A partir da análise documental de 210 relatórios dos Jogos Escolares da Rede Pública da Bahia (JERP), este estudo teve por objetivo descrever a evolução histórica do JERP de 2009 a 2017, considerando as modalidades comuns e inovadoras ofertadas, número de escolares, número de escolas, número de professores e recursos financeiros descentralizados. Verificamos que as modalidades inovadoras foram numericamente superiores às modalidades comuns e apresentaram maior diversificação das práticas esportivas; o número de escolares, escolas e professores na primeira etapa dos jogos (dentro das escolas) foi superior a terceira etapa (regional), além de aumentar ao longo dos anos em ambas as etapas; e que o valor financeiro descentralizado tendeu a crescer no período histórico analisado. Concluímos que o JERP se apresenta como uma oportunidade dos alunos vivenciarem diferentes modalidades esportivas, entretanto esta oportunidade é ressaltada apenas na primeira etapa. Em relação aos recursos financeiros descentralizados para o JERP, parece não haver planejamento prévio com relação a proporção destes recursos e a proporção de escolares participantes deste programa. Sugerimos maior concentração de recursos em competições locais do que estaduais, uma vez que atendem mais crianças e jovens e favorecem a valorização da diversificação de modalidades e respeito à cultura esportiva local.

ABSTRACT Based on the documentary analysis of 210 reports of the Scholars Games of the Bahia State Public System (JERP), this study aimed to describe the historical evolution of the JERP from 2009 to 2017 considering the common and innovative modalities offered, number of school children, number of schools , number of teachers and decentralized financial resources. It was verified that the innovative modalities were numerically superior to the common modalities and presented a greater diversification of the sports practices; the number of students, schools, and teachers in the games' first stage (inside of the schools) was superior to the third stage (regional), besides increase over the years in both stages; and that the decentralized financial value tended to grow in the historical period analyzed. It is concluded that the JERP presents itself as an opportunity for students to experience different sports modalities, however this opportunity is highlighted only in the first stage. Regarding the decentralized financial resources for the JERP, there seems to be no prior planning regarding the proportion of these resources and the proportion of students participating in this program. We suggest a higher concentration of resources in local rather than state competitions, since the local competitions serve more children and young people and support the modalities diversification and respect to the local sports culture.

The usefulness of Tanita TBF-310 for body composition assessment in Judo athletes using a four-compartment molecular model as the reference method.

Body composition assessment at the molecular level is relevant for the athletic population and its association with high performance is well recognized. The four-compartment molecular model (4C) is the reference method for fat mass (FM) and fat-free mass (FFM) estimation. However, its implementation in a real context is not feasible. Coaches and athletes need practical body composition methods for body composition assessment, and the bioelectrical impedance analysis method (BIA) is usually seen as a useful alternative. The aim of this study was to test the validity of BIA (Tanita, TBF-310) to determine the FM and FFM of elite judo athletes. A total of 29 males were evaluated in a period of weight stability using the reference method (4C) and the alternative method (Tanita, TBF-310). Regarding the 4C method, total-body water was assessed by deuterium dilution, bone mineral by DXA, and body volume by air displacement plethysmography. The slops and intercepts differed from 1 (0.39 and 1.11) and 0 (4.24 and -6.41) for FM and FFM, respectively. FM from Tanita TBF-310 overestimated the 4C method by 0.2 kg although no differences were found for FFM. Tanita TBF-310 explained 21% and 72% respectively in the estimation of absolute values of FM and FFM from the 4C method. Limits of agreement were significant, varying from -6.7 kg to 7.0 kg for FM and from -8.9 kg to 7.5 kg for FFM. In conclusion, TBF-310 Tanita is not a valid alternative method for estimating body composition in highly trained judo athletes.

The usefulness of Tanita TBF-310 for body composition assessment in Judo athletes using a four-compartment molecular model as the reference method

SUMMARY Body composition assessment at the molecular level is relevant for the athletic population and its association with high performance is well recognized. The four-compartment molecular model (4C) is the reference method for fat mass (FM) and fat-free mass (FFM) estimation. However, its implementation in a real context is not feasible. Coaches and athletes need practical body composition methods for body composition assessment, and the bioelectrical impedance analysis method (BIA) is usually seen as a useful alternative. The aim of this study was to test the validity of BIA (Tanita, TBF-310) to determine the FM and FFM of elite judo athletes. A total of 29 males were evaluated in a period of weight stability using the reference method (4C) and the alternative method (Tanita, TBF-310). Regarding the 4C method, total-body water was assessed by deuterium dilution, bone mineral by DXA, and body volume by air displacement plethysmography. The slops and intercepts differed from 1 (0.39 and 1.11) and 0 (4.24 and -6.41) for FM and FFM, respectively. FM from Tanita TBF-310 overestimated the 4C method by 0.2 kg although no differences were found for FFM. Tanita TBF-310 explained 21% and 72% respectively in the estimation of absolute values of FM and FFM from the 4C method. Limits of agreement were significant, varying from -6.7 kg to 7.0 kg for FM and from -8.9 kg to 7.5 kg for FFM. In conclusion, TBF-310 Tanita is not a valid alternative method for estimating body composition in highly trained judo athletes.

RESUMO A avaliação da composição corporal ao nível molecular é relevante para a população esportiva e sua associação com o alto rendimento é bem reconhecida. O modelo molecular a quatro compartimentos (4C) é o método de referência para as estimativas de massa gorda (MG) e massa livre de gordura (MLG). No entanto, sua implementação no contexto real não é viável. Técnicos e atletas precisam de métodos práticos de composição corporal para a avaliação da composição corporal e o método de análise de impedância bioelétrica (BIA) é geralmente visto como uma alternativa útil. O objetivo deste estudo foi testar a validade da BIA (Tanita, TBF-310) na determinação de MG e MLG em atletas de elite de judô. Um total de 29 atletas masculinos foi avaliado em um período de estabilidade de peso usando o método de referência (4C) e o método alternativo (Tanita, TBF-310). Em relação ao método a 4C, a água corporal total foi avaliada pela diluição de deutério, mineral ósseo por DXA e volume corporal por pletismografia por deslocamento de ar. Os declives e interceções diferiram de 1 (0,39 e 1,11) e 0 (4,24 e -6,41) para MG e MLG, respectivamente. A MG da Tanita TBF-310 superestimou o método 4C em 0,2 kg, embora não tenham sido encontradas diferenças para MLG. A Tanita TBF-310 explicou 21% e 72%, respectivamente, na estimativa dos valores absolutos de MG e MLG do método a 4C. Os limites de concordância foram grandes, variando de -6,7 kg a 7,0 kg para MG e de -8,9 kg a 7,5 kg para MLG. Em conclusão, a TBF-310 Tanita não é um método alternativo válido para estimar a composição corporal em judocas altamente treinados.

Intensity of Health Behaviors in People Who Practice Combat Sports and Martial Arts.

Background: Health behaviors are associated with a healthy lifestyle, in which relative possibilities of choice play an important part. Athletes are a group of people who should particularly endeavor to have a health-oriented lifestyle. It is believed that combat sports (CS) and martial arts (MA) have an especially significant educational potential, connected with several desirable values which provide positive patterns of health behaviors. The aim of the work was to assess the intensity of health behaviors in athletes who practiced CS and MA in relation to the length of their training history, their age, sex, place of residence, education level, and financial situation. Methods: The research involved 441 men and women who practiced boxing (B), Brazilian ju-jitsu (BJJ), karate (K), mixed martial arts (MMA) and Muay Thai (MT). The average age of the subjects was 24.68 ± 8.24 years. The standardized Health Behavior Inventory (HBI) questionnaire and another questionnaire for a lifestyle survey were applied. Individual behaviors covered four areas: Correct eating habits (CEH), preventive behaviors (PB), positive mental attitude (PMA), and health practices (HP). The one-way analysis of variance (F-test) for independent groups was used (ANOVA). The effect size was calculated with Hedge's g for Student's t-test, and with Cramér's V for the χ2 test. The value of p ≤ 0.05 was assumed to be statistically significant. Results: CS and MA athletes presented a moderate level of health behaviors. The greater intensity of health behaviors (HBI and its categories) was found among B, K and MMA athletes, and the smaller among those who practiced MT. Correct eating habits (CEH) were characteristic of subjects who practiced every day and whose length of training history was 4-8 years. Greater intensity of preventive behaviors (PB) was observed among individuals aged under-19 years, who still studied. Greater intensity of health practices (HP) was found among those who exercised every day. Influence of financial situation was observed in relations to PMA. Conclusions: It seems that the existing educational potential of CS and MA was not fully realized in the studied population. Determining the place of health in the system of values of CS and MA athletes may be the basis for predicting health behaviors and developing health education programs.

Peripheral Vision in Martial Arts Experts: The Cost-Dependent Anchoring of Gaze.

Research on martial arts has suggested that gaze anchoring is functional for optimizing the use of peripheral visual information. The current study predicted that the height of gaze anchoring on the opponent's body would depend on the potential attacking locations that need to be monitored. To test this prediction, the authors compared high-level athletes in kung fu (Qwan Ki Do), who attack with their arms and legs, with Tae Kwon Do fighters, who attack mostly with their legs. As predicted, the results show that Qwan Ki Do athletes anchor their gaze higher than Tae Kwon Do athletes do before and even during the first attack. In addition, gaze anchoring seems to depend on 3 factors: the particulars of the evolving situation, crucial cues, and specific visual costs (especially suppressed information pickup during saccades). These 3 factors should be considered in future studies on gaze behavior in sports to find the most functional, that is, cost-benefit-optimized, gaze pattern.

Effects of the Application of a Program of Adapted Utilitarian Judo (JUA) on the Fear of Falling Syndrome (FOF) for the Health Sustainability of the Elderly Population.

This research analyzes the fall history of a group of elderly people and studies the effects of an intervention program based on Adapted Utilitarian Judo (JUA) to teach fall control in subjects with fear of falling syndrome (FOF). We adopted a quasi-experimental research design with pre-post measurement of the experimental group, in a healthy, pre-fragile sample of 12 women aged 71.5 ± 8 years, chosen using non-probabilistic-incidental accessibility sampling. The WHO questionnaire was used for the functional assessment of the fall. To evaluate FOF, we applied the 16-item version of the Falls Efficacy Scale-International (FES-I), (pretest and posttest). This intervention program was based on Adapted Utilitarian Judo and conducted over 8 weeks, with two 60-minute sessions each week. After analyzing the scores obtained by the subjects in the pre and post FES-I, we found that the intervention with the JUA program had been significant for the experimental group with p ≤ 0.004, and there was an 11.9% decrease in the fear of falling (FES-I pos = 18.17). The results show that after the application of the JUA program there were significant improvements in subjects' perception of FOF, with this being greater in those who had the highest levels of fear of falling before the intervention.

Concomitant assessment of DNA oxidation and bone resorption over a rapid body mass reduction period in female judokas.

The purpose of this study was to concomitantly determine oxidative DNAdamage and bone resorption following a rapid body mass reduction in association with energy restriction and exercise training, considering 17ß-estradiol level, in female collegiate judokas. Eighteen nationally ranked university female judokas were enrolled as participants in this study. All participants continuously managed to reduce their body mass 8 days just before a competition. To detect cumulative effects of oxidative DNA damage and bone resorption, urinary samples were collected in the morning on three different days (Day 1= the beginning of body mass reduction; Day 4=mid-term of body mass reduction; Day 7=the day before the competition) for the later analysis of 8-hydroxy-2’- deoxyguanosine (8-OHdG) as well as cross-linked N-terminal telopeptides of Type I collagen (NTx). Urinary 8-OHdG and NTx levels were determined with high performance liquid chromatography and enzyme-linked immunosorbent assay, respectively. No significant alterations were observed in urinary 8-OHdG or NTx levels over a rapid body mass reduction period. The findings of the present study indicate that female judokas appear to have relatively less oxidative DNA damage determined by quantification of 8-OHdG and bone resorption over a rapid body mass reduction period, potentially due to the enhanced endogenous defense responses (training adaptation). These data can provide athletes and coaches with valuable information in considering an optimal body mass management program to avoid detrimental physiological and biological conditions.

Sport Activity for Health!! The Effects of Karate Participants' Involvement, Perceived Value, and Leisure Benefits on Recommendation Intention.

This study intends to discuss the effects of participants’ involvement, perceived value, and leisure benefits on recommendation intention in the sport of karate. The questionnaires were collected online by karate clubs on Facebook and included 369 valid participants. The research findings show that karate participants from different places of residence do not display significant differences in involvement, perceived value, leisure benefits, and recommendation intention. Furthermore, “attraction” in the involvement category reveals the highest mean, “paid spirit and energy being worthy” in perceived value appears as the highest mean, and “physiological benefits” in leisure benefits shows the highest mean. The Pearson correlation analysis result presents significant strong positive correlations between involvement, perceived value, leisure benefits, and recommendation intention. Finally, multiple regression analysis reveals that leisure benefits, except “physiological benefits”, show notably positive effects on recommendation intention. According to the research results, suggestions are proposed for the reference of karate teaching business managers, participants, and future research.