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http://grupodestudoslutas.blogspot.com

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Quem sou eu

São Paulo, São Paulo, Brazil
Professor da EEFE-USP; Praticante e Pesquisador de Judô; Preparador físico de atletas de modalidades esportivas de combate.

Arquivo do blog

segunda-feira, 31 de dezembro de 2012

Feliz 2013!!!

Escrevo para agradecer aos que me deram a oportunidade de praticar judô, discutir ideias, escrever e pensar nos projetos para os próximos anos.
2012 foi um ano ao mesmo tempo muito duro em alguns aspectos e de muito sucesso em muitos outros.
Tinha planejado escrever um texto longo, agradecendo um por um, mas o cansaço e a preguiça não permitiram. E isso é bom, porque tenho descansado bem nesses dias de recesso : )
Espero que todos vocês possam aproveitar 2013.
Feliz ano novo.

sábado, 29 de dezembro de 2012

Perfil antropométrico e de aptidão física de atletas de TKD

http://fefnet178.fef.unicamp.br/ojs/index.php/fef/article/view/768/pdf

quarta-feira, 26 de dezembro de 2012

Cubanos no MMA

Dica do Fabrício:
http://esporte.uol.com.br/lutas/vale-tudo/ultimas-noticias/2012/12/23/no-pais-do-boxe-cubanos-contrariam-governo-treinam-mma-sem-apoio-e-miram-ufc.htm

quinta-feira, 20 de dezembro de 2012

Primeiro artigo sobre "tapering" em esportes de combate que vejo


Journal of Strength & Conditioning Research:
POST ACCEPTANCE, 17 December 2012
doi: 10.1519/JSC.0b013e31827fd85c
Original Investigation: PDF Only

Salivary Hormones, Iga and Performance During Intense Training and Tapering in Judo Athletes

Papacosta, Elena; Gleeson, Michael; Nassis, George P.

Published Ahead-of-Print
http://journals.lww.com/nsca-jscr/pages/articleviewer.aspx?year=9000&issue=00000&article=97937&type=abstract

Ciências do esporte na visão de treinadores


 2012 Dec 19. [Epub ahead of print]

Sport science relevance and application: Perceptions of UK coaches.

Source

a Edinburgh Napier University, SLSSS , Edinburgh , United Kingdom.

Abstract

Abstract While sport science can have significant and positive impact on coaches and athletes, there is still a general consensus that the transfer of sport science knowledge to coaching is poor. Given this apparent dilemma, this study investigated the perceptions of sport science from coaches across four different sports (football, rugby league, curling and judo) across three different levels (elite, developmental and novice). Specifically, 58 coaches (19 football; 21 rugby league; 9 curling; 9 judo) drawn evenly from novice, developmental and elite groups agreed to take part and were interviewed. Three key features emerged from the analysis 1) Practical application and relevance 2) Integration and access, 3) Language. In short, there was significant variability in the extent to which sport science was considered relevant and to whom, although interestingly this was not strongly related to coaching level. This inconsistency of understanding was a barrier to sport science engagement in some instances, as was the challenge of operationalising information for specific contexts. Furthermore, availability of opportunities and resources were often left to chance, while overuse of jargon and inability for research and practitioners to consider sport specific needs were also considered barriers to engagement. Implications for research and practice are discussed.

Que beleza : (

http://m.globoesporte.globo.com/lutas/noticia/2012/12/enganado-no-rio-campeao-de-carate-recebe-ajuda-para-voltar-para-casa.html

História do judô feminino na Bélgica

The Early Development of Women's Judo in Belgium from the Liberation to the late 1950s: Emancipation, Sport and Self-defence
Haimo Groenena*

Abstract

This cultural and comparative history examines the early development of women's judo in Belgium through gender and sport, and within the different communities and federations. Born in the late 1940s, women's judo in Belgium remained both a minority sport and under the domination of men during the 1950s. Circumscribed by dominant gender norms imposing a traditional representation of women, women's judo was, nevertheless, also a means for emancipation. It turned to recreational sport and self-defence in the Flemish part of the country, as well as temporarily to competitions in one part of the French-speaking community. The latter was generally a more conducive space to recognition and emancipation of female judokas. These similarities and differences lay in the articulation of several factors: cultural specificities of judo, influence of French and Japanese models, conceptions of pioneers and federal leaders, sociocultural characteristics of the linguistic communities, importance of Catholicism and emancipation of women.
Les débuts du judo féminin en Belgique de la Libération aux années 1950: émancipation, sport et self-défense
À travers une histoire culturelle et comparée, cette contribution questionne les débuts du judo belge féminin sous l'angle du genre et de la dimension sportive, ainsi qu'au regard des différentes communautés et fédrations. Né à la fin des années 1940, le judo belge féminin reste, durant la décennie suivante, minoritaire et sous tutelle masculine. Circonscrit par des normes de genre dominantes imposant une représentation traditionnelle de la femme, le judo féminin constitue pourtant également un moyen d'émancipation. Il s'oriente alors, en Flandre, vers la self-défense et le loisir sportif, mais aussi temporairement vers des compétitions dans la communauté francophone, plus propice à la valorisation et à l'émancipation des judokas féminins. Ces points communs et différences tiennent à l'articulation de plusieurs facteurs: les spécificités culturelles du judo, l'influence de modèles français et japonais, les conceptions des pionniers et responsables fédéraux, les caractéristiques socioculturelles des communautés linguistiques, le poids du catholicisme et l'émancipation des femmes.
El desarrollo inicial del judo femenino en Bélgica desde la Liberación hasta finales de los años 50: emancipación, deporte y autodefensa
Esta historia cultural y comparativa analiza el desarrollo inicial del judo femenino en Bélgica desde la perspectiva del género y el deporte, y en el marco de las diversas comunidades y federaciones. Surgido a finales de los años 40, el judo femenino fue un deporte minoritario y controlado por los hombres durante los años 50. El judo femenino estaba constreñido por las normas de género dominantes, que imponían una representación tradicional de las mujeres, pero también era un instrumento de emancipación. Se convirtió en un deporte recreativo y de autodefensa en la parte flamenca del país, mientras que en la parte francófona dio pie durante algún tiempo a competiciones. Éstas últimas constituían generalmente un espacio más propicio para el reconocimiento y la emancipación de las mujeres judokas. Estas similitudes y diferencias derivan de la articulación de varios factores: las especificidades culturales del judo, la influencia de los modelos francés y japonés, las ideas de los pioneros y de los líderes federales, las características socioculturales de las comunidades lingüísticas, la importancia del catolicismo y el grado de emancipación de las mujeres.
Die frühe Entwicklung des Frauen-Judo in Belgien von der Befreiung bis zu en späten 1950er Jahren: Emanzipation, Sport und Selbstverteidigung
Diese kulturelle und vergleichende Geschichte untersucht die frühe Entwicklung des Frauen-Judo in Belgien über Gender und Sport und innerhalb der verschiedenen Gemeinden und Verbände. Geboren in den späten 1940er Jahren blieb Frauen-Judo in Belgien in den 1950er Jahren sowohl eine Randsportart als auch unter der Vorherrschaft der Männer. Beschränkt durch dominante Gender-Normen, die eine traditionelle Darstellung von Frauen aufzwangen, war Frauen-Judo dennoch auch ein Mittel zur Emanzipation. Es wandte sich zum Freizeitsport und zur Selbstverteidigung im flämischen Teil des Landes sowie vorübergehend zu Wettkämpfen in einem Teil der französischsprachigen Gemeinschaft. Letzteres war im Allgemeinen eine förderlichere Rahmenbedingung für die Anerkennung und Emanzipation weiblicher Judoka. Diese Gemeinsamkeiten und Unterschiede hingen von mehreren Faktoren ab: kulturelle Besonderheiten des Judo, Einfluss französischer und japanischer Modelle, Vorstellungen von Pionieren und Führern auf Bundesebene, soziokulturelle Merkmale der Sprachgemeinschaften, Bedeutung des Katholizismus und der Emanzipation der Frauen.

Matéria da BBC sobre karate

http://www.bbc.co.uk/news/science-environment-19290320

Link do artigo:
http://cercor.oxfordjournals.org/content/early/2012/08/08/cercor.bhs219.full.pdf+html

sábado, 15 de dezembro de 2012

Suplementação com alga e secreção de IgA em atletas de kendo


 2012 Dec 11;11(1):103. [Epub ahead of print]

Chlorella intake attenuates reduced salivary SIgA secretion in kendo training camp participants.

Abstract

ABSTRACT:

BACKGROUND: The green alga Chlorella contains high levels of proteins, vitamins, and minerals. We previously reported that a chlorella-derived multicomponent supplement increased the secretion rate of salivary secretory immunoglobulin A (SIgA) in humans. Here, we investigated whether intake of this chlorella-derived supplement attenuated the reduced salivary SIgA secretion rate during a kendo training camp.

METHODS:

Ten female kendo athletes participated in inter-university 6-day spring and 4-day summer camps. They were randomized into two groups; one took placebo tablets during the spring camp and chlorella tablets during the summer camp, while the other took chlorella tablets during the spring camp and placebo tablets during the summer camp. Subjects took these tablets starting 4 weeks before the camp until post-camp saliva sampling. Salivary SIgA concentrations were measured by ELISA.

RESULTS:

All subjects participated in nearly all training programs, and body-mass changes and subjective physical well-being scores during the camps were comparable between the groups. However, salivary SIgA secretion rate changes were different between these groups. Salivary SIgA secretion rates decreased during the camp in the placebo group (before vs. second, middle, and final day of camp, and after the camp: 146 +/- 89 vs. 87 +/- 56, 70 +/- 45, 94 +/- 58, and 116 +/- 71 mug/min), whereas no such decreases were observed in the chlorella group (121 +/- 53 vs. 113 +/- 68, 98 +/- 69,115 +/- 80, and 128 +/- 59 mug/min).

CONCLUSION:

Our results suggest that a use of a chlorella-derived dietary supplement attenuates reduced salivary SIgA secretion during a training camp for a competitive sport.

Perfil físico e fisiológico de atletas de luta olímpica chinesas


 2012 Dec 12. [Epub ahead of print]

PHYSIOLOGICAL PROFILE OF ELITE CHINESE FEMALE WRESTLERS.

Source

1Biology Center, China Institute of Sport Science, Beijing, China 2Elite Sports College, Wuhan Sports University, Wuhan, China 3Elite Sports College, Beijing Sports University, Beijing, China 4The Combat and Weightlifting Administration Center of Shandong province, Jinan, China 5The Combat and Weightlifting Administration Center of Anhui province, Hefei, China 6Department of Biomedicine, Universidad Europea de Madrid, Spain 7Health, Exercise Science and Sport Management, University of Wisconsin-Parkside, Kenosha, WI., U.S.A.

Abstract

ABSTRACT: The purpose of this investigation was to describe the physiological profile of elite senior Chinese female wrestlers. Twenty-five elite wrestlers, nationally ranked in the top-3 of their weight class, participated in the study. The subjects included Olympic and world champion medalists. The physiological profile included testing of running maximal oxygen consumption (VO2max), 3,200 m run time, 400 m run time, 30 s Wingate anaerobic power and capacity, shoulder, elbow, knee and trunk isokinetic torque, and one repetition maximums (1 RM) in specified exercises. The major results (mean ± SD) were VO2max: 50.58 ± 3.33 ml kg min; 3,200 m run: 14.1 min ± 0.49 s; 400m run: 1min 11 s ± 4 s; Wingate maximal anaerobic power: 495.21 ± 79.13 W and mean power: 262.97 ± 52.39 W; 1 RM dead lift: 124 ± 19 kg; 1 RM deep squat: 98 ± 11 kg; 1 RM prone rowing: 72 ± 8 kg; 1 RM power clean: 76 ± 12 kg; and 1 RM hold and squat: 109 ± 17 kg. In absolute terms in the majority of measures the heavier weight classes had greater values than the lighter weight classes, but relative to body mass there were few differences in measures between weight classes. In most measures the best value was that of an Olympic and/or world championship medalist. The results indicate female wrestling success is not dependent upon one physiological characteristic, but that a variety of physiological profiles can result in success. This data on elite female wrestlers can be compared to other wrestlers to help determine individual weaknesses or strengths, and to design training programs that result inwrestling success.

quinta-feira, 13 de dezembro de 2012

Perda de peso: nossa revisão


Perda de peso nas modalidades esportivas de combate: efeitos fisiológicos, psicológicos e de desempenho
Journal of the International Society of Sports Nutrition 2012, 9:52 doi:10.1186/1550-2783-9-52

domingo, 9 de dezembro de 2012

FIJ muda as regras do judô (de novo)

O mais interessante é a confusão que vai ser pesar todo mundo duas vezes...

quinta-feira, 6 de dezembro de 2012

Hablando "Español"

Palestra na Universidad de las Americas (Chile)

Artigo sobre respostas cardiovasculares ao jogo de capoeira

http://faculty.css.edu/tboone2/asep/JEPonlineDECEMBER2012_Silva_Souza.pdf

terça-feira, 4 de dezembro de 2012

Vídeo do Leandro em entrevista com o pessoal do COI

http://www.youtube.com/watch?feature=player_embedded&v=y4PFvV5gb9I

segunda-feira, 3 de dezembro de 2012

Reunião final do grupo de estudos no dia 14/12, 13:30h

Não haverá reunião dia 07/12, mas faremos o encerramento das reuniões de 2012 no dia 14/12.

domingo, 25 de novembro de 2012

Quantificação de cargas no treino de karate

http://www.scielo.br/pdf/rbme/v18n4/v18n4a12.pdf

Só tenho dúvida se podemos correlacionar variáveis que tenham sido multiplicadas por uma terceira (neste caso o tempo).

sábado, 24 de novembro de 2012

AS PRÁTICAS CORPORAIS DE LUTAS PELA ORDEM DO DISCURSO CIENTÍFICO DA EDUCAÇÃO FÍSICA

Análise de artigos de cinco periódicos nacionais da área de educação física.
A adição do termo "brasileira" no título ajudaria a delimitar melhor o que foi feito.

http://repositorio.furg.br:8080/jspui/bitstream/1/2781/1/AS%20PR%C3%81TICAS%20CORPORAIS%20DE%20LUTAS%20PELA%20ORDEM%20DO.pdf


quinta-feira, 22 de novembro de 2012

Artigo de revisão sobre testes específicos para atletas de judô

http://150.162.1.115/index.php/rbcdh/article/viewFile/22071/23099

quarta-feira, 14 de novembro de 2012

Orelhas atléticas

http://bleacherreport.com/articles/1135061-15-worst-mangled-ears-caught-on-camera-in-sports-history

terça-feira, 13 de novembro de 2012

Estrutura temporal e respostas fisiológicas em luta de Muay Thai


Physiological responses and match analysis of Muay Thai fighting

Authors: Cappai, Ivo; Pierantozzi, Emanuela; Tam, Enrico; Tocco, Filippo; Angius, Luca; Milia, Raffaele; Squatrito, Salvatore; Concu, Alberto; Crisafulli, Antonio
Source: International Journal of Performance Analysis in Sport, Volume 12, Number 3, December 2012 , pp. 507-516(10)

Abstract:
This study was devised to measure certain physiological variables related to the energy requirement together with a match analysis during real Muay Thai matches. Twenty skilled male fighters were recruited and performed a laboratory incremental preliminary test to assess their maximum oxygen uptake and anaerobic threshold. They were then involved in real Muay Thai competitions. During matches heart rate (HR) and blood lactate (BLa) values were collected. Moreover, matches were filmed and analysed for subsequent determination of the techniques used. Differences between winners and losers were assessed. During matches HR was on average 178.9±0.3 bpm (i.e. close to the maximum level reached during the preliminary test), while BLa was 9.72±0.6 mmol•L-1. There was no difference in HR and BLa responses between winners and losers. Winners and losers used a similar number of techniques. However, the effectiveness of attacks was higher in winners. This investigation provides evidence that during Muay Thai the lactic anaerobic system is widely recruited and that the cardiovascular apparatus is highly stressed with no difference between winners and losers. Moreover, successful athletes use the same number of techniques as losers, although with greater effectiveness, thus indicating that the training strategy should aim at developing high technical skills.

segunda-feira, 12 de novembro de 2012

Artigos sobre kung fu

http://www.kungfurj.com.br/artigos-cientificos/

domingo, 11 de novembro de 2012

No primeiro anúncio ia ser em 2013 e o do RJ em 2015, agora...

http://www.lancenet.com.br/minuto/Mudanca-orcamento-Mundial-Judo-Paulo_0_776922563.html

São Paulo sempre atrás nos eventos esportivos...

terça-feira, 6 de novembro de 2012

Desenvolvimento de ferramenta para análise notacional no boxe


 2012 Nov 2. [Epub ahead of print]

The development of a reliable amateur boxing performance analysis template.

Source

a University of Chester, Sport and Exercise Sciences , Chester , United Kingdom.

Abstract

Abstract The aim of this study was to devise a valid performance analysis system for the assessment of the movement characteristics associated with competitive amateur boxing and assess its reliability using analysts of varying experience of the sport and performance analysis. Key performance indicators to characterise the demands of an amateur contest (offensive, defensive and feinting) were developed and notated using a computerised notational analysis system. Data were subjected to intra- and inter-observer reliability assessment using median sign tests and calculating the proportion of agreement within predetermined limits of error. For all performance indicators, intra-observer reliability revealed non-significant differences between observations (P > 0.05) and high agreement was established (80-100%) regardless of whether exact or the reference value of ±1 was applied. Inter-observer reliability was less impressive for both analysts (amateur boxer and experienced analyst), with the proportion of agreement ranging from 33-100%. Nonetheless, there was no systematic bias between observations for any indicator (P > 0.05), and the proportion of agreement within the reference range (±1) was 100%. A reliable performance analysis template has been developed for the assessment of amateurboxing performance and is available for use by researchers, coaches and athletes to classify and quantify the movement characteristics of amateurboxing.

sexta-feira, 2 de novembro de 2012

Alterações fisiológicas durante a temporada de luta olímpica


 2012 Oct 16. [Epub ahead of print]

Effects of a competitive wrestling season on body composition, endocrine markers, and anaerobic exercise performance in NCAA collegiate wrestlers.

Source

Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ, 08628, USA, ratamess@tcnj.edu.

Abstract

Few data exist examining the body composition, endocrine, and anaerobic exercise performance changes over a competitive wrestling season. Eighteen NCAA wrestlers were tested for endocrine markers, body composition, hydration, grip strength, and power on four occasions: prior to pre-season training (T1); after pre-season training 3 days prior to the first seasonal meet (T2); mid-season one day prior to a meet (T3); and at the end of the season 2-3 days following the last meet (T4). Body mass, percent body fat (BF %), and fat mass were significantly lower (P ≤ 0.05) at T2 and T3 compared to T1 but were not different between T1 and T4. Lean body mass was significantly reduced at T2 only. Urine specific gravity was significantly elevated at T3 compared to T1, T2, and T4. Resting cortisol concentrations did not change but resting testosterone concentrations were significantly reduced at T2, T3, and T4. Maximal grip strength was significantly reduced at T2. Vertical jump peak power was significantly reduced at T2, T3, and T4. Wingate peak power was significantly reduced at T2 and T3. However, Wingate average power and total work did not significantly change. Fatigue rate during the Wingate test was significantly improved at T2, T3, and T4 compared to T1. In conclusion, body mass, BF %, and measures of peak force and power were reduced for most of the competitive wrestling season. Competitive wrestling reduces resting total testosterone concentrations throughout the entire season.

quinta-feira, 1 de novembro de 2012

Determinantes psicológicos do rendimento de esgrimistas


SELECTED PSYCHOLOGICAL DETERMINANTS OF SPORTS RESULTS
IN SENIOR FENCERS
MACIEJ TOMCZAK*, MAŁGORZATA WALCZAK, GRZEGORZ BRĘCZEWSKI
University School of Physical Education, Poznań, Poland
AbSTrAcT
Purpose. The aim of the present study was to determine the correlations between the strength of the stimulation process,  mobility of nervous processes, achievement motivation and sports results of fencers in the senior age category. Methods. The sample was comprised of 38 senior fencers (19 men and 19 women) aged 21–32 years. The strength of the stimulation process and mobility of nervous processes were assessed with the Strelau and Zawadzki PTS inventory. The subjects’ achievement mo­ tivation was measured with the achievement motivation questionnaire by Widerszal­bazyl. Results. The study revealed that  senior fencers (women, in particular) featured higher mean levels of the examined psychological determinants, i.e., strength
of the stimulation process, mobility of nervous processes and achievement motivation than the general population in the same age range. Strong and statistically significant correlations were found between all the studied psychological determinants and sports results among the male fencers in the sample. In the group of female fencers none of the correlations were statistically significant. Conclusions. The results might provoke reflection on the role of coaches and, consequently, may have implications for the cooperation between coaches and athletes, indicating that the individual psychological differences of fencers should be considered during training. The coach may also decide on the necessity for considering on the reported diversification within the gender or age domain, and the need to consider such psychological properties as temperamental characteristics or the level of achievement motivation.

Key words: psychology, temperamental features, achievement motivation, fencing

quarta-feira, 24 de outubro de 2012

Uso de atividades motoras complexas no treinamento de boxeadores jovens


Technical performance effectiveness subsequent to complex motor skills training in young boxers

DOI:
10.1080/17461391.2011.606976
Said El Ashkera*
pages 475-484
Received: 07 Apr 2011
Accepted: 05 Jun 2011
Version of record first published: 01 Nov 2011
Article Views: 47

Abstract

Boxing is a sport that comprises a wide variety of integrated offensive, defensive and counter-attack skills performed in an unpredictable environment. Mastering the variety of complex motor skills (CMS) that are required in a boxing match allows the player to employ the best motor performance in most positions of the actual game. This study aimed to assess the associations between implementing CMS versus simple motor skill (SMS) training and the subsequent changes in physical, technical and technical performance effectiveness (TPE) variables in junior boxers. We employed an experimental design that comprised two groups (each 20 males, mean age = 15.22±0.62 years). For 12 weeks, intervention boxers received CMS training, while controls received traditional SMS training. Physical, technical and TPE variables were measured before and after the training programs. Although the two groups were of similar abilities at baseline, there were statistically significant differences (P<0 .05=".05" abilities="abilities" absolute="absolute" across="across" advantage="advantage" and="and" better="better" between="between" boxers="boxers" cms="cms" contribute="contribute" control="control" could="could" developing="developing" differences="differences" enhance="enhance" exhibited="exhibited" favourable="favourable" group.="group." group="group" i.e.="i.e." improvements="improvements" in="in" intervention="intervention" junior="junior" measures="measures" more="more" of="of" or="or" p="p" performance.="performance." physical="physical" positively="positively" post="post" ratios="ratios" relative="relative" technical="technical" terms="terms" the="the" their="their" to="to" tpe.="tpe." values="values" variables="variables">

segunda-feira, 22 de outubro de 2012

Karate e controle postural

Is karate effective in improving postural control?
Davide Filingeri 1, Antonino Bianco 2, Daniele Zangla 3, Antonio Paoli 4, Antonio Palma 5
1 - Environmental Ergonomics Research Centre, Loughborough University, UK
2 - Department of Sports Science (DISMOT), University of Palermo, Palermo, Italy | School of Sport, CONI Sicilia, Palermo, Italy 
3 - Department of Sports Science (DISMOT), University of Palermo, Palermo, Italy
4 - Department of Anatomy and Physiology, Physiology Section, Padova, Italy
5 - Department of Sports Science (DISMOT), University of Palermo, Palermo | School of Sport, CONI Sicilia, Palermo, Italy 
Arch Budo 2012; 8(4):
Manuscript ID: 883521
Article type: Review article
Abstract provided by Publisher  
 
Background and Study Aim: Performing complex motor skills, such as the ones performed by karate athletes, requires a great sense of balance. Because the posturo-kinetic performance seems to be improved by sport practice, especially by sports involving a lot of posturokinetic activities, the aim of this review was to critically analyse the scientific literature in order to appraise whether any positive correlation between karate and improved postural control is scientifically supported.
Material and Methods: The online search engines Scirus and Medline were used for generating the data. A comprehensive literature search was conducted based on the following keywords: “karate”, “postural control” and “body sway”. Results were collected and filtered manually.
Results: Four articles were identified related to karate practice and postural control, covering a period between 1998 and 2009. Although different experimental approaches were used to investigate this concept, overall the results of these studies confirm the effectiveness of karate in improving postural control.
Conclusions: Practicing karate seems to elicit long term improvements in postural control. However, a much deeper approach to this fighting sport, which would take into account its technical specificities (e.g. kata & kumite), is required in order to increase our understanding of the posture-kinetic impact of this relatively unexplored sport activity.

domingo, 21 de outubro de 2012

Suplementação de arginina em lutadores de BJJ


 2012 Jun 26;9(1):30. [Epub ahead of print]

A sportomics strategy to analyze the ability of arginine to modulate both ammonia and lymphocyte levels in blood after high-intensity exercise.

Abstract

ABSTRACT:

BACKGROUND: Exercise is an excellent tool to study the interactions between metabolic stress and the immune system. Specifically, high-intensity exercises both produce transient hyperammonemia and influence the distribution of white blood cells. Carbohydrates and glutamine and arginine supplementation were previously shown to effectively modulate ammonia levels during exercise. In this study, we used a short-duration, high-intensity exercise together with a low carbohydrate diet to induce a hyperammonemia state and better understand how arginine influences both ammonemia and the distribution of leukocytes in the blood.

METHODS:

Brazilian Jiu-Jitsu practitioners (men, n = 39) volunteered for this study. The subjects followed a low-carbohydrate diet for four days before the trials and received either arginine supplementation (100 mg.kg-1 of body mass.day-1) or a placebo. The intergroup statistical significance was calculated by a one-way analysis of variance, followed by Student's t-test. The data correlations were calculated using Pearson's test.

RESULTS:

In the control group, ammonemia increased during matches at almost twice the rate of the arginine group (25 mmol.L-1.min-1 and 13 mumol.L-1.min-1, respectively). Exercise induced an increase in leukocytes of approximately 75%. An even greater difference was observed in the lymphocyte count, which increased 2.2-fold in the control group; this increase was partially prevented by arginine supplementation. The shape of the ammonemia curve suggests that arginine helps prevent increases in ammonia levels.

CONCLUSIONS:

These data indicate that increases in lymphocytes and ammonia are simultaneously reduced by arginine supplementation. We propose that increased serum lymphocytes could be related to changes in ammonemia and ammonia metabolism.

quarta-feira, 17 de outubro de 2012

Doenças infecciosas em esportes competitivos


 2012;47(5):516-8. doi: 10.4085/1062-6050-47.5.02.

Infectious disease outbreaks in competitive sports, 2005-2010.

Source

Central Pathology Laboratory, Trinity College Dublin, St. James's Dublin, 8, Ireland. collinc6@tcd.ie.

Abstract

CONTEXT:

Old, evolving, and new infectious agents continually threaten the participation of competitors in sports.

OBJECTIVE:

To provide an update of the medical literature on infectious disease outbreaks in sport for the last 5 years (May 2005-November 2010). Main Outcome Measure(s): A total of 21 outbreaks or clusters were identified.

RESULTS:

Methicillin-resistant Staphylococcus aureus (n = 7, 33%; mainly community acquired) and tinea (trichophytosis: n = 6, 29%) were the most common pathogens responsible for outbreaks. Skin and soft tissue was the most common site of infection (n = 15, 71%).

CONCLUSIONS:

The majority of outbreaks reported occurred in close-contact sports, mainly combat sports (ie, wrestlingjudo) and American football. Twelve outbreaks (57%) involved high school or collegiate competitors. Common community outbreak pathogens, such as influenza virus and norovirus, have received little attention.

terça-feira, 16 de outubro de 2012

Antropometria de atletas de TKD



Differences in body components and the significance of rehabilitation for taekwondo athletes compared to nonathletes

Volume 4, Number 3 (2012), 203-208DOI: 10.1007/s13530-012-0137-2

Abstract

It is well known that the difference in individual characteristics showed between somatotypes and body components. However, few studies have investigated differences in body components and gender in taekwondo athletes compared to nonathletes. The present study is to analyze the body components and skin-fold thickness of taekwondo athletes compared to nonathletes, and to contribute to current research on rehabilitation and its application and significance. The fat body mass and impedance were significantly decreased in the taekwondo athlete compared with the nonathletic groups. The same values of the men group showed significantly greater decreases than those of the women in both the nonathlete and taekwondo groups. But, the lean body mass, basal metabolic rate (BMR), and total body water were significantly increased in the taekwondo athlete compared with the nonathletic groups. In terms of gender, the values of the men in both the nonathlete and taekwondo groups showed significantly greater increases than those of the women of both groups. However, there were no significant differences between the men and women skin-fold thickness data for all participants. Therefore, these results, in part, found that there was a difference in body components between taekwondo athletes and nonathletes. Also, when applying physical stimuli such as electrotherapy, ultrasound, and heat, the body components of each patient for healthy life need to be carefully considered.



domingo, 14 de outubro de 2012

Raiva entre atletas adolescentes


 2012 Mar;22(1):9-14.

Anger in Adolescent Boy Athletes: a Comparison among JudoKarate, Swimming and Non Athletes.

Source

Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran ; Department of Pediatrics, Tehran University of Medical Sciences, Tehran, Iran.

Abstract

OBJECTIVE:

Karate and judo are originally Japanese martial arts which may have different influences on adolescents' behavior. This study was conducted to examine the total anger rate and its subscale-reactive anger, instrumental anger, and anger control-rates in young karateka and judoka.

METHODS:

A cross-sectional study was carried out in 11 to 19-year old boys. Adolescents included in the study were judoka (n=70), karateka (n=66), swimmers (n=59), and non athletes (n=96). One stage cluster sampling method was used to select judoka, karateka, and swimmers from sport clubs in Tehran. Students of governmental schools at the same area were chosen as the non-athletes group. The "Adolescent Anger Rating Scale" questionnaire was utilized to assess the anger rate.

FINDINGS:

The mean age of participants was 12.90(±2.06) years. The total anger rates were 45.40 (±5.61) in judoka, 41.53(±5.63) in karateka, 41.19(±5.33) in swimmers, and 45.44 (±8.58) in non athletes. In total anger scale karateka and swimmers had a significantly lower score compared to judoka and non athletes. In instrumental anger subscale the difference was significant just between karateka and non athletes. In reactive anger subscale judoka showed higher scores than swimmers. In anger control subscale the difference was significant between judoka and swimmers and also judoka and karateka. The difference of anger control between karateka and non athletes was significant.

CONCLUSION:

The findings of this study propose a difference in the anger rate between judoka and karateka. In contrary to the results of previous studies, judo training may have no influence on anger control, while karate training could be beneficial.

quinta-feira, 11 de outubro de 2012

Experimento interessante: efeito do barulho sobre as decisões da arbitragem em lutas de Muay Thai com lutadores da casa e visitantes


 2012;3:346. Epub 2012 Sep 14.

The Impact of Crowd Noise on Officiating in Muay Thai: Achieving External Validity in an Experimental Setting.

Source

Newman University College Birmingham, UK.

Abstract

Numerous factors have been proposed to explain the home advantage in sport. Several authors have suggested that a partisan home crowd enhances home advantage and that this is at least in part a consequence of their influence on officiating. However, while experimental studies examining this phenomenon have high levels of internal validity (since only the "crowd noise" intervention is allowed to vary), they suffer from a lack of external validity, with decision-making in a laboratory setting typically bearing little resemblance to decision-making in live sports settings. Conversely, observational and quasi-experimental studies with high levels of external validity suffer from low levels of internal validity as countless factors besides crowd noise vary. The present study provides a unique opportunity to address these criticisms, by conducting a controlled experiment on the impact of crowd noise on officiating in a live tournament setting. Seventeen qualified judges officiated on thirty Thai boxing bouts in a live international tournament setting featuring "home" and "away" boxers. In each bout, judges were randomized into a "noise" (live sound) or "no crowd noise" (noise-canceling headphones and white noise) condition, resulting in 59 judgments in the "no crowd noise" and 61 in the "crowd noise" condition. The results provide the first experimental evidence of the impact of live crowd noise on officials in sport. A cross-classified statistical model indicated that crowd noise had a statistically significant impact, equating to just over half a point per bout (in the context of five round bouts with the "10-point must" scoring system shared with professional boxing). The practical significance of the findings, their implications for officiating and for the future conduct of crowd noise studies are discussed.

segunda-feira, 8 de outubro de 2012

Campeonato Paulista de Kendô

Dica do Guilherme Oliveira:



*** Campeonato Paulista de Kendo 2012 ***
Dia 14 de Outubro de 2012, no Parque Esportivo dos
Trabalhadores.
Endereço: Rua Canuto de Abreu, s/n°, Tatuapé – SP
Data e horário: dia 14 de Outubro de 2012, a partir das 8h

sexta-feira, 5 de outubro de 2012

Soco no karate: diferenças entre homens e mulheres


 2012 Aug;115(1):228-40.

Sex differences in electromechanical delay during a punch movement.

Source

Sport Sciences School of Rio Maior, Polytechnic Institute of Santarém, Rio Maior, Portugal. marioarf@gmail.com

Abstract

This study assessed how sex of participant is related to electromechanical delay during a karate punch. Ten male (M age = 25.00 yr., SD = 3.02; M height=174.9 cm, SD=6.3; M weight = 71.13 kg, SD=9.35) and 8 female (M age = 27.4 yr., SD = 6.0; M height = 161.4 cm, SD = 5.1; M weight = 59.09 kg, SD = 7.00) karate athletes performed 10 ballistic punches to a target as hard as possible. Kinematic analysis and surface electromyographic (EMG) activity of the upper-limb muscles were recorded. Men had a significantly shorter electromechanical delay in the anterior portion of the deltoid, showing a larger effectiveness in the transfer of the contractile force for the beginning of movement. Agonist and antagonist relationships show intermuscular coordination differences between the sexes. Results revealed the existence of a different neuromuscular coordination pattern of motor control between men and women, although a similar kinematic pattern was expected due to karate practice.

segunda-feira, 1 de outubro de 2012

Home advantage no judô

Journal of Sports Sciences, 2012; 1–7, iFirst article
Home advantage in judo: A study of the world ranking list
Abstract
In 2009, the International Judo Federation established a ranking system (RS) to classify athletes and to distribute the competitor quotas of the Olympic Games. However, the RS does not consider the home advantage. This issue has not been studied in judo, and its implications for the RS have not been determined. The objective was to verify the home advantage in judo in terms of winning a medal or the number of matches won. Therefore, 25 competitions that computed points for the RS in 2009 were analysed. Logistic regression analysis and the Poisson generalised linear model were used for the analyses, which included the relative quality of the athletes. The sample was composed only of athletes who had competed both at home and away. The odds ratio for winning medals was higher for athletes who competed at home for both males and females. The association between the number of matches won and competing at home was significant only for the male athletes. The home advantage was observed in the competitions that used the judo RS. Thus, it is likely that athletes from countries that host competitions using the RS have an advantage in terms of obtaining their Olympic classification.