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Search Results: 1 - 10 of 167545 matches for " Jo?o Carlos Bouzas;Prado "
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Effect of player substitutions on the intensity of second-half soccer match play
Coelho, Daniel Barbosa;Coelho, Leonardo Gomes Martins;Morandi, Rodrigo Figueiredo;Ferreira Junior, Joo Batista;Marins, Joo Carlos Bouzas;Prado, Luciano Sales;Soares, Danusa Dias;Silami-Garcia, Emerson;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n2p183
Abstract: most soccer matches are conducted by coaches who usually make all player substitutions allowed. therefore, it is extremely important to study these substitutions and their effects on the intensity of effort required from players. to date, no published studies have reported on this topic using heart rate (hr) as an intensity parameter. the objective of this study was to compare effort intensity (ei) of soccer players in the following situations: 1) first half (fh-ei); 2) second half (sh-ei); 3) second half with substitutions (shs-ei). forty-five male soccer players (18.5±1.2 years old, 74.25±5.79 kg, 182.6±8.55 cm, 9.56±2.47% body fat, 56.3±4.3 mlo2/kg/min) were evaluated during 29 official games. ei was considered as the mean hr, expressed as the percentage of each player's maximal hr (%hrmax) and as the time spent in each intensity zone (z) according to %hrmax (z1<70%; z2 70-85%; z3 85-90%; z4 90-95%; z5 95-100%). fh-ei (86.3±3.3%hrmax) was higher than sh-ei (80.6±4.4%hrmax) and shs-ei (83.6±2.8%hrmax). shs-ei was higher than sh-ei (p<0.05). time spent in high-intensity zones was lower in sh-ei than in fh-ei, but higher in shs-ei when compared to sh-ei (p<0.05). it was concluded that the decrease in ei in the second half of soccer matches was attenuated by substitutions made at halftime, as evidenced by a longer time spent in high-intensity zones when compared to sh-ei.
Teste de for?a/resistência de membros superiores: análise metodológica e dados normativos
Marinho, Bruno Ferreira;Marins, Joo Carlos Bouzas;
Fisioterapia em Movimento , 2012, DOI: 10.1590/S0103-51502012000100021
Abstract: introduction: the strength and muscular endurance are important components of physical fitness for health and high performance. the tests of push-up, pull-up and modified pull-up, using own body weight and evaluate motor skills related to physical fitness, health and athletic performance, to measure the strength and muscular endurance upper limbs in both sexes and a wide age range. objectives: the aim of this study was to search the literature methodological issues related to validity, reliability, objectivity and specific procedures used in tests: push-up, pull-up and modified pull-up, by doing so, a survey of indicators yield of these tests in elite athletes of different modalities. conclusion: the tests of push-up, pull-up and modified pull-up are efficient, reliable, easy to apply and are tools that employ low cost, and require little training for evaluators. however, as we draw attention to the standardization and methodological recommendations for your applications so they can be safely used in rehabilitation and athletic performance.
Teste de for?a de preens?o manual: análise metodológica e dados normativos em atletas
Fernandes, Alex de Andrade;Marins, Joo Carlos Bouzas;
Fisioterapia em Movimento , 2011, DOI: 10.1590/S0103-51502011000300021
Abstract: introduction: there are different sports that use the hand as a major body segment involved in performance: judo, tennis, sailing, rowing, boxing, weightlifting and others. handgrip strength is required in sports where the level of force generated can be the difference in the final performance. manual dynamometry is a valuable tool that can be used in the detection of sporting talents, training control and in the assessment of injury recovery. objectives: the aim of this study is to review the main methodological aspects involved in the measurement of hand grip strength, using the jamartm dynamometer and identifying the features of validity, reliability, precision, position for doing the test, handle position, instructions, number of measures, rest period between attempts, duration of contraction, and pre-test heating. materials and methods: an electronic search of the literature available on the area was carried out, using the databases of medline, scielo and lilacs. the keywords used were: handgrip strength, manual dynomometry, hand, grip, strength, dynamometer, jamar, norms and reference values. conclusion: the values of handgrip strength displayed by the athletes differ according to sport, sex, body weight, level of the athlete, age and type of training. handgrip strength should be present in the batteries of tests to identify potential sporting talents.
Os efeitos do treinamento de for?a sobre os fatores de risco da síndrome metabólica
Guttierres, Ana Paula Muniz;Marins, Joo Carlos Bouzas;
Revista Brasileira de Epidemiologia , 2008, DOI: 10.1590/S1415-790X2008000100014
Abstract: introduction: non-pharmacological measures, such as practicing physical activity, have been recommended for prevention and treatment of non-transmissible chronic diseases. objective: to review the mechanisms by which resistance training results in metabolic and cellular alterations that act positively on metabolic syndrome risk factors. method: the search was limited to the past 10 years, using the medline, scielo, science direct and capes databases. the terms used in the search were: obesity, dyslipidemia, hypertension, diabetes mellitus, metabolic syndrome, resistance training, weight lifting, and exercise. results: resistance training affects metabolic and cellular parameters. it may have positive effects on the control and prevention of metabolic syndrome risk factors, such as reduction of body weight, increase in insulin sensitivity, increase in glucose tolerance, reduction of blood pressure levels at rest and improvement of blood lipid profile. conclusion: the review gives evidence that resistance training may contribute to reduce metabolic syndrome risk factors.
Effect of three breakfast interventions on blood glucose during low-intensity exercise performed on a treadmill
Paula Guedes Cocate,Joo Carlos Bouzas Marins
Revista Brasileira de Cineantropometria e Desempenho Humano , 2007,
Abstract: The objective of this work was to evaluate blood glucose (BG) response during a low-intensity activity, preceded by the consumption of three different types of breakfast (BF). Fifteen Physical Education male students of mean age of 22.7 ± 2 years were evaluated. Three BF interventions were carried out on different days :fasting; BF1: cookie, juice, apple, cereal bar or BF2: 400 mL carbohydrate drink) 60 minutes before jogging/walking for 1 hour at 50-60% of maximum calculated HR (heart rate). Measurements of BG were taken at 60 and 30 minutes prior to activity and every 20 minutes during exercise. Heart rate, blood pressure (BP) and RPE were also monitored. Statistical analysis was by ANOVA with Tukey test and aimed to identify differences both in effect over time and between different BF interventions, to a signifi cance level of P < 0.05. The results indicate an absence of any difference in HR, BP or RPE response between the three procedures. There was a statistical difference in BG between BF1 and BF2 during the period immediately before exercise, but no differences were observed during exercise for any of the three treatments. In terms of behavior over time, BG at 30 minutes pre-exercise was signifi cantly higher than at other sample times, for both for BF1 and BF2. It was concluded that fasting or the levels of energy intake proposed in this study one hour before physical work did not cause alterations to the physiological responses of HR, RPE, BP or BG during that exercise activity. RESUMO O objetivo deste trabalho foi avaliar a resposta da glicose sangüínea (GS) ao longo de uma atividade de baixa intensidade, precedida pelo consumo de diferentes tipos de café da manh (CM). Foram avaliados 15 estudantes Educa o Física, do gênero masculino com idade média de 22,7 ± 2 anos. Os avaliados realizaram, em dias diferenciados, três a es de CM (CM0: jejum; CM1: biscoito, suco, ma , barra de cereal; ou CM2: 400mL de bebida carboidratada) 60 minutos antes de um trote/caminhada a 50 – 60% da FC máxima calculada com dura o de uma hora. A mensura o da GS ocorreu 60 e 30 minutos antes da atividade e durante intervalos de 20 minutos no exercício. Foram também monitorizadas a FC, press o arterial (PA) e IPE. O tratamento estatístico correspondeu à ANOVA associada ao teste de Tukey, para determinar a existência de diferen as tanto no efeito tempo como entre as a es de CM, com nível de signifi cancia de P < 0,05. Os resultados indicaram ausência de diferen a na resposta da FC, PA e IPE entre os três procedimentos. A GS apresentou diferen a estatística entre o
Validade preditiva de equa??es de referência para for?a de preens?o manual em homens brasileiros de meia idade e idosos
Fernandes, Alex de Andrade;Silva, Cristiano Diniz da;Vieira, Breno Cesar;Marins, Joo Carlos Bouzas;
Fisioterapia e Pesquisa , 2012, DOI: 10.1590/S1809-29502012000400010
Abstract: the objective of this study was to verify the predictive validity of reference equations for hand grip strength (hgs) in middle-aged and elderly brazilian men. we evaluated 60 men with age of 58.7±8.6 years, height 168.7±8.0 cm, body mass 67.9±13.0 kg, and body mass index 23.7±4.0 kg/m2, utilizing the gold standard equipment for evaluation of hgs and following all methodological recommendations of the american society of hand therapists (asth). the results of the bland-altman diagram for the dominant hand (dh) had a mean error (bias) of -8.4% (95%ci -51.6-34.7). the bland-altman diagram for the non-dominant hand (ndh) had a mean error (bias) of 1.4% (95%ci -47.1-49.8). the calculation of cronbach's alpha was 0.69 for the dh and 0.59 for the ndh. the intraclass correlation coefficient was 0.52 (95%ci 31-68) for the dh and 0.42 (95%ci 20-60) for the ndh. we therefore conclude that the reference equations for hgs evaluated in this study has low predictive validity for a population of brazilian men middle-aged and elderly, and may lead to a misinterpretation of the results.
Revis?o crítica dos métodos disponíveis para avaliar a composi??o corporal em grandes estudos populacionais e clínicos
Rezende,Fabiane; Rosado,Lina; Franceschinni,Sylvia; Rosado,Gilberto; Ribeiro,Rita; Bouzas Marins,Joo Carlos;
Archivos Latinoamericanos de Nutrición , 2007,
Abstract: the corporal composition evaluation is extremely important for the individual and population nutritional state diagnosis and for the establishment of appropriate clinical-nutritional conducts. an excess of body fat is frequently associated with important metabolic alterations and chronic diseases, such as diabetes, hypertension and dyslipidemia the availability of methods to assess body composition is essential to evaluate health status of individuals.there are several methods for the corporal composition analysis, and it is important to know the limitation of each one and his/her validity so that the obtained estimates are reliable and correctly interpreted. the purpose of this study was to revise the applicability of some nutritional state indicators and corporal composition evaluation methods, such as corporal mass index, waist circumference and waist-hip relation, skinfold measurements, bioelectrical impedance analysis and near-infrared interactance.
Análise do modelo de avalia??o física aplicado aos árbitros de futebol pela FIFA
Cerqueira, Matheus Santos;Silva, Alberto Inácio da;Marins, Joo Carlos Bouzas;
Revista Brasileira de Medicina do Esporte , 2011, DOI: 10.1590/S1517-86922011000600012
Abstract: introduction: in order to control and select the referees for performance in professional soccer, the fédération internacionale de football association (fifa), considered the accomplishment of physical tests. however, the initial proposal of evaluation suffered modifications with the passing of the years, and the current model seems not to be ideal to evaluate the referees, in accordance with the physical profile requirement demonstrated during the games. objective: therefore, the objectives of this study were: to identify the physical load of soccer referees in official games and to determine the physiological demands associates to the physical effort during the official games; and to analyze the current model of physical evaluation of the soccer referees. conclusion: referees cover an average of 10,000 meters during a game, being most of the time done with activities of low intensity. the activity profile is intermittent and the energy demand has predominance of the aerobic system, with important participation of the anaerobic system. the current tests applied are not compatible with the standard of physical requirement of a referee during a soccer game.
Valida??o de equa??es antropométricas que estimam a densidade corporal em atletas profissionais de futebol
Fonseca, Paulo Henrique Santos da;Marins, Joo Carlos Bouzas;Silva, Alexandre Tavares da;
Revista Brasileira de Medicina do Esporte , 2007, DOI: 10.1590/S1517-86922007000300005
Abstract: the objective of this study was to validate equations which estimate the body density in professional soccer players. twenty-five soccer players were evaluated, aged 22.7 ± 4.4 years, body mass 73.9 ± 6.6 kg, and height 177.8 ± 5.5 cm, who played in the state championship of the federa??o gaúcha de futebol in 2004. the validity of 11 anthropometric equations were analyzed by the process: pearson correlation (r), dependent t test, constant error (ec), total error (et) and estimated standard error (epe), using hydrostatic weight as the "gold standard." in the current study of 11 equations, only the equations proposed by jackson and pollock (1978) are valid for estimating the body density of professional soccer players, since the other equations analyzed in this study present considerable errors in their estimation.
Valida??o do tempo de mensura??o da freqüência cardíaca após esfor?o submáximo a 50 e 80%
Marins, Joo Carlos Bouzas;Luiz, Adriano;Monteiro, André;Jesus, Geraldo de;
Revista Brasileira de Medicina do Esporte , 1998, DOI: 10.1590/S1517-86921998000400004
Abstract: the purpose of this study was to evaluate the existence of significant different between the recovery heart rate, measured at different intervals of time after physical exercise (6, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60 seconds, respectively) and the exercise heart rate. twenty-six voluntary subjects at ages varying from 19 to 26 years were evaluated. all were male, non-athletes, nonsmokers, with or without regular practice of physical exercise. the data were collected at the laboratory of human performance of the department of physical education, at the university of vi?osa. state of minas gerais, brazil. the instrument used for physical effort was "movimento 2000" cycloergometer and "polar acurex" cardiotachometer was used for heart rate measurements. the protocol included the measurement of the heart rate recovery curve during one minute after a bout of submaximal exercise, characterizing a time of 10 minutes at steady state in two situations: (a) 50% and (b) 80%. for the target heart rate (thr) calculation, the following formula proposed by karvonen was used: thr = % (max-hr - resthr) + resthr. after 10 minutes of steady state, the subject was instructed to interrupt the exercise completely, starting a passive process of recovery. the last hr during effort and the hr at the following intervals after effort were recorded: 6, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60 seconds. the only non-significant result (p > 0.05) obtained was for the 6-second partial measurement, both for the effort at 50% and 80%; the differences of the values obtained for the hr from the 10-second partial measurement and beyond it were significant. with the results obtained in this study, it is possible to conclude that the ideal recording of the hr after a submaximal exercise at 50 and 80% of maxhr should encompass a time of approximately 6 seconds. the 10-second partial measurement, albeit considered statistically significant and different, presented in absolute values a red
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