oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 16 )

2018 ( 44 )

2017 ( 44 )

2016 ( 35 )

Custom range...

Search Results: 1 - 10 of 11898 matches for " Alexandre Hideki Okano "
All listed articles are free for downloading (OA Articles)
Page 1 /11898
Display every page Item
A dinamica de altera??o das medidas de for?a e o efeito posterior duradouro de treinamento em basquetebolistas submetidos ao sistema de treinamento em bloco
Moreira, Alexandre;Oliveira, Paulo Roberto de;Okano, Alexandre Hideki;Souza, Marcel de;Arruda, Miguel de;
Revista Brasileira de Medicina do Esporte , 2004, DOI: 10.1590/S1517-86922004000400002
Abstract: the present study had as objective to investigate the alteration dynamics of the vertical jump explosive power (vj), the horizontal jump explosive power (hj) and the fast horizontal power to the right leg (stcd) and left leg (stce) in the distinct preparation stages in adult basketball players submitted to the block training system. the group studied was composed of 12 athletes from the main league who participate in the s?o paulo state basketball championship (a1). eight athletes fully accomplished the program and were included in the analysis. the athletes were submitted to a preparation bicyclical structure (first macro-cycle with 23 weeks and the second with 19 weeks). in the structuring of the model, the macro-cycle was divided in basic stage (power concentrated loads), special stage and competition stage. the basic stage had duration of eight weeks in the first training macro-cycle and three weeks in the second macro-cycle. the athletes were evaluated in eight distinct moments of the annual cycle, characterizing a longitudinal investigation. the results demonstrated: 1) the efficiency of the block training system in basketball, evidenced by the punctual expression of the posterior long-lasting training effect (plte); 2) the competition loads presented different effects for vj and hj and 3) several occurrences verified between stcd and stce, demonstrating the necessity of evaluating and analyzing in details the results of the different jump tests when used as control parameters of the training effects.
Efeito de oito semanas de suplementa??o com creatina monoidratada sobre o trabalho total relativo em esfor?os intermitentes máximos no cicloerg?metro de homens treinados
Altimari, Leandro Ricardo;Okano, Alexandre Hideki;Trindade, Michele Caroline de Costa;Cyrino, Edilson Serpeloni;Tirapegui, Julio;
Revista Brasileira de Ciências Farmacêuticas , 2006, DOI: 10.1590/S1516-93322006000200008
Abstract: this study investigated the effect of long-term supplementation with creatine monohydrate (crm) on relative total work (rtw) in intermittent maximal efforts in the cycle ergometer of trained men. twenty six individuals were randomly divided in creatine group (cr, n=13) and placebo group (pl, n=13). the subjects received in a double-blind manner, doses of crm or placebo-maltodextrin (20 g.d-1 for 5 days and 3 g.d-1 for 51 subsequent days). the groups had their alimentary habits and physical fitness controlled previously. for determination of the rtw the subjects were submitted to exercise protocol in cycle ergometer comprised three 30s anaerobic wingate test interspersed with two minutes recovery, before and after the supplementation period. anova, followed by the tukey post hoc test, when p<0.05, were used for data treatment. there was a significant time effect for rtw (f1,24=8.00; p<0.05), with the cr group demonstrating significant greater (3%) on the rtw production compared to pl group after the supplementation period (690.54 ± 46.83 vs 655.71 ± 74.34 j.kg-1 respectively; p<0.05). the results of the present study suggest that crm supplementation improve the performance in repeated efforts of high intensity and short duration.
Impact of the use of different skinfold calipers for the analysis of the body composition
Cyrino Edilson Serpeloni,Okano Alexandre Hideki,Glaner Maria Fátima,Romanzini Marcelo
Revista Brasileira de Medicina do Esporte , 2003,
Abstract: With the advances in the studies of body composition, it has been observed that several factors can interfere with the estimates of relative body fat using the skinfold thicknesses method. Therefore, the purpose of this study was to investigate the impact of the use of different skinfold calipers for the analysis of body composition by skinfold thicknesses measurements. Two hundred and fifty nine male subjects (23.3 ± 2.9 years) took part of the study. Nine skinfold thicknesses were measured (abdominal, subscapular, suprailiac, triceps, biceps, midaxillary, chest, medial calf, and thigh) using the Lange (USA) and the Cescorf (Brazil) calipers with accuracy of 1.0 and 0.1 mm, respectively. Significant differences were found in the comparison between the two calipers on all the investigated skinfold thicknesses (1.8 to 31.0%) with highest values obtained by the Lange caliper (p < 0.01). When these values were applied to four different predictive equations, developed by different researchers, the body fat estimate was significantly modified (p < 0.01), resulting in differences of 5.2 to 6.9%. Results indicate that the use of different skinfold calipers may maximize the errors of estimation produced by different predictive equations used for the analysis of body composition.
Percep o subjetiva do esfor o, resposta afetiva e hipotens o pós-exercício em sess o de Tai Chi Chuan Rating of perceived exertion, affective response and post-exercise hypotension in Tai Chi Chuan session
Cheng Hsin Nery Chao,Alexandre Hideki Okano,Paulo André Holanda Savir,Emanuel Augusto Alves
Motriz: Revista de Educa??o Física , 2013,
Abstract: O objetivo do estudo foi analisar a percep o subjetiva do esfor o (PSE), resposta afetiva (RA) e press o arterial pós-exercício em sess o aguda de Tai Chi Chuan (TCC). Vinte e quatro mulheres (47-79 anos; 9 normotensas e 15 hipertensas) foram submetidas a uma sess o de TCC e uma sess o controle (delineamento cruzado). A PSE foi avaliada pela escala de Borg (CR10), a RA pela escala de valência afetiva (+5/-5) e a press o arterial (PA) pelo método oscilométrico (5, 10, 25, 20, 25 e 30 min pós-sess o). Redu o significante da PA sistólica foi identificada aos 20 e 25 min após a sess o de TCC somente nas hipertensas. Os valores de RA e PSE foram +2,8 ± 1,9 e 3,5 ± 1,2, respectivamente. Os resultados sugerem que uma sess o de TCC de intensidade moderada foi prazerosa para as voluntárias (hipertensas e normotensas), embora tenha induzido discreto efeito hipotensor agudo na PA sistólica somente das hipertensas. The aim of the study was to analyze the rating of perceived exertion (RPE), affective response (AR), and blood pressure (BP) post-exercise in acute Tai Chi Chuan (TCC) session. Twenty-four women (47-79 years; 9 normotensive and 15 hypertensive) performed one TCC and one control session (cross-over design). The RPE was assessed using the Borg's scale (CR10), the AR was assessed by the Feeling Scale (+5/-5) and the BP by the oscillometric method (5, 10, 15, 20, 25, and 30min post-TCC session). A significant systolic BP reduction was observed in the 20 and 25min post-TCC session only in the hypertensive women. The AR and RPE values were +2.8 ± 1.9 e 3.5 ± 1.2, respectively. The results suggest that a moderate TCC exercise bout was pleasurable for the volunteers (normotensive and hypertensive), although it has induced a slight acute hypotensive effect on the systolic BP only in the hypertensive women.
Estimula o cerebral na promo o da saúde e melhoria do desempenho físico Brain stimulation for health and exercise performance improvement
Alexandre Hideki Okano,Rafael Ayres Montenegro,Paulo de Tarso Veras Farinatti,Li Min Li
Revista Brasileira de Educa??o Física e Esporte , 2013,
Abstract: O avan o tecnológico das últimas décadas tem proporcionado o uso eficaz de técnicas n o-invasivas na neuromodula o cerebral. Atualmente, as principais técnicas de neuromodula o s o a estimula o magnética transcraniana (EMT) e a estimula o transcraniana por corrente contínua (ETCC). Por meio de revis o da literatura, o presente estudo aborda: a) história da estimula o cerebral; b) mecanismos de a o estudados através da neurofisiologia motora, farmacologia, neuroimagem e animais experimentais; c) perspectivas de aplica es da estimula o cerebral para promo o da saúde e melhoria do desempenho físico, incluindo o controle auton mico cardíaco e hipotens o pós-exercício, o controle de apetite e a modula o da fadiga e desempenho físico; e d) aspectos de seguran a referentes ao uso da ETCC. Dessa forma, a ETCC parece ser uma técnica efetiva e segura para modular a fun o cerebral e podemos vislumbrar algumas perspectivas de aplica o no ambito da ingest o alimentar, saúde cardiovascular e desempenho físico. The technological advances of the last decades have provided the effective use of noninvasive techniques in neuromodulation with concomitant health benefits. Currently, the main neuromodulation techniques are transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS). Through literature review, this study addresses the a) history of brain stimulation and the b) mechanisms of action studied by motor neurophysiology, pharmacology, neuroimaging, and experimental animals. Moreover, it is presented the c) perspectives for applications of brain stimulation for promoting health and improving physical performance, including cardiac autonomic control and post-exercise hypotension, control and modulation of appetite, fatigue and physical performance. Finally, we describe d) the security aspects related to the use of tDCS. Thus, tDCS seems to be an effective and safe technique to modulate brain function and suggests some application associated to food intake, cardiovascular health and physical performance.
Determination of the critical power and anaerobic work capacity of canoeists on an arm ergometer, using two linear equations
Juliana Melo Altimari,Leandro Ricardo Altimari,Alexandre Hideki Okano,Edilson Serpeloni Cyrino
Revista Brasileira de Cineantropometria e Desempenho Humano , 2007,
Abstract: The objective of the present study was to investigate the infl uence of two linear models on the determination of critical potential (CP) and anaerobic work capacity (AnWC) of canoeists evaluated on an arm ergometer. Eight male canoeists (17.1 ± 1.1 years; 63.3 ± 6.5 kg; 173.4 ± 4.3 cm) volunteered to take part in the study. Two different linear equations were employed to calculate CP and AnWC: power-1/time and work-time, using three different power levels (Wlim) and their respective times to exhaustion (tlim). The athletes underwent six test sessions on an arm ergometer at 70 rpm until voluntary exhaustion, with and interval of 24 hours between sessions, at two different intensities each day, with a minimum interval of 90 minutes. The statistical analysis employed descriptive statistics, Student’s t test and Pearson’s linear correlation (P < 0.05). The power-1/time equation produced a signifi cantly higher CP than the work-time equation (144.6 ± 17.3 W vs. 141.9 ± 16.5 W, respectively; P < 0.05), whereas AnWC was signifi cantly greater when calculated by work-time than when calculated by power-1/time (12.8 ± 2.9 kJ vs. 13.9 ± 3.2 kJ; respectively, P < 0.05). The coefficient of correlation between power-1/time and work-time for CP and AnWC was r=0.98 and r=0.92, respectively (P < 0.05). Despite this high level of correlation between the models in terms of CP and AnWC, the results suggest that adopting different models appears to interfere in the calculation of CP and AnWC of exercise on an arm ergometer. RESUMO O objetivo do presente estudo foi verifi car a infl uência de dois modelos lineares na determina o da potência crítica (PC) e da capacidade de trabalho anaeróbio (CTAn), em erg metro de bra o, em atletas de canoagem. Para tanto, oito canoístas do sexo masculino (17,1 ± 1,1 anos; 63,3 ± 6,5 kg; 173,4 ± 4,3 cm), participaram voluntariamente desta investiga o. A PC e a CTAn foram obtidas por meio de duas equa es lineares: potência-1/tempo e trabalho-tempo, utilizando três potências (Wlim) e seus respectivos tempos até a exaust o (tlim). Os atletas foram submetidos a seis sess es de testes em erg metro de bra o a 70 rpm até a exaust o voluntária, com intervalo de 24 horas entre cada sess o, a duas intensidades diferentes a cada dia, com intervalo mínimo de 90 minutos. Para o tratamento estatístico utilizou-se a estatística descritiva, teste t de Student e correla o linear de Pearson (P < 0,05). A PC da equa o potência-1/tempo foi significativamente maior que da equa o trabalho-tempo (144,6 ± 17,3 W vs 141,9 ± 16,5 W, respectivamente; P < 0,05),
Can neuromuscular fatigue threshold bedetermined by short and non-exhaustive bouts?. DOI: http://dx.doi.org/10.5007/1980-0037.2012v14n3p254
Eduardo Bodnariuc Fontes,Alexandre Hideki Okano,Bruno de Paula Smirmaul,Leandro Ricardo Altimari
Revista Brasileira de Cineantropometria e Desempenho Humano , 2012,
Abstract: The present study determined the neuromuscular fatigue threshold (NFT) using four different time-periods of analysis of the electromyographic signal and compared these estimations with critical power (CP). Fifteen healthy young men (73.6 ± 5.1 kg, 177.8 ± 7.0 cm, 23.4 ± 5.2 years) performed 3-4 different severe constant workload trials until exhaustion on a cycle ergometer with simultaneous SEMG signals acquisition. The obtained data permitted NFT estimation with four different periods of analysis as follows: initial 30s (T30), 1min (T1), 2min (T2) and total time (TT), as well as CP. T30 and T1 were significantly higher than TT and CP and, T2 and TT did not differ between each other, and both were significantly higher than CP. In addition, TT was significantly correlated to CP (0.72; P < 0.05) and to T2 (0.58; P < 0.05). We conclude that NFT overestimates CP, independent of the time-period analysis used for its determination.
Behavior of the muscle strength and arm muscle area during 24 weeks of weight training
Alexandre Hideki Okano,Edilson Serpeloni Cyrino,Fábio Yuzo Nakamura,Débora Alves Guariglia
Revista Brasileira de Cineantropometria e Desempenho Humano , 2008,
Abstract: The purpose of this study was to analyze the behavior of muscle strength and arm muscle area (AMA) over24 weeks of weight training (WT) as well as to establish possible associations between these variables. The sample wascomposed of 18 men aged between 18 and 30 years. Measurements of relaxed arm circumference and triceps skinfoldmeasurement were used for the calculation. Muscle strength was assessed using the one-repetition maximum test (1-RM)on the arm curl exercise. The WT protocol lasted 24 weeks, divided into 3 stages (F1, F2, and F3) of 8 weeks each. It isimportant to emphasize that every measurement was made before, during and after the end of the WT period. Analysis ofvariance (ANOVA) for repeated measures followed by the Tukey post hoc (P < 0.05) was used to the compare the indicatorsof muscle strength and muscle hypertrophy. Pearson’s correlation coefficient was used to verify possible association betweenmuscle strength and AMA. Muscle strength and AMA increased continuously throughout the whole period except for theinitial period (F1). Therefore, it is concluded that the initial phase of training, neuromuscular adaptation, seems to havebeen the turning point for increase in muscle strength. After that, the hypertrophy process appears to gradually become theessential factor for increase in muscle strength.
Training level does not influence the rating of perceived exertion during an incremental test
Bruno de Paula Cara?a Smirmaul,José Luiz Dantas,Eduardo Bodnariuc Fontes,Alexandre Hideki Okano
Revista Brasileira de Cineantropometria e Desempenho Humano , 2010,
Abstract: Different training levels, combined with experience in performing exhaustive exercise, may produce different sensations of fatigue. The objective of this study was to compare the rating of perceived exertion (RPE) between cyclists and non-cyclists during a maximal incremental test (ITMAX). Twenty-three subjects were recruited and divided into a cyclist group (CG) (n = 12; age: 26.5 ± 4.7 years, body weight: 68.2 ± 11kg, height: 176 ± 8.6 cm) and a non-cyclist group (NCG) (n = 11; 25.2 ± 4.0 years, body weight: 72.9 ± 9 kg, height: 175.1 ± 6.3 cm). All subjects per formed an ITMAX unt i l exhaust ion on a cycl ing simulator, start ing at 0 W and with increment s of 20 W.min-1. RPE was measured at 30-second intervals during ITMAX and the maximal power output (PMAX) of each subject was also recorded. The total time of each test was normalized to the percentage of completed trial (10% to 100%, intervals of 10%), and the corresponding RPE was recorded. PMAX was 368 ± 12.7 W and 256 ± 11.2 W for CG and NCG, respectively (P < 0.01). No significant difference in median RPE was observed between groups at any time point. In conclusion, RPE responses did not differ between CG and NCG during ITMAX, suggesting that training level does not influence RPE.
Articulate torque and electromyographic activity of biceps femoris and semitendinosus muscles during isokinetic knee flexion movements in soccer athletes
Carlos Eduardo Bassi Rodrigues,Antonio Carlos de Moares,Alexandre Hideki Okano,Eduardo Bodnariuc Fontes
Revista Brasileira de Cineantropometria e Desempenho Humano , 2007,
Abstract: The objective of the present study was to analyze the articulate torque (TO) and the electromyographic activity (EMG) of soccer athlete’s long head Biceps Femoris (BF) and Semitendinosus (ST) muscles during isokinetic knee fl exion movements (concentric-CON and eccentric-ECC actions) at differing velocities, carried out in the ventral decubitus position. Fourteen soccer players aged 19 and 20 years old (71.2 ± 6.5 kg, 176.6 ± 6.4 cm) were enrolled from the Associa o Atlética Ponte Preta under- 20 team. They followed a protocol specifying 5 repetitions of fl exion (CON and ECC action) of the knee at three velocities (60, 180 and 300o/s) at random. The recovery interval between series adopted was 3 minutes. EMG Activity was recorded using surface electrodes and data were expressed in terms of root mean squares (RMS). Statistical analysis employed analysis of variance (Friedman test) for repeated measures followed by the Wilcoxon test when necessary, with the level of signifi cance set at P<0.05. The highest TO fi gures were observed at 60o/s velocity in the CON phase. There was no signifi cant variation in TO between different velocities in the ECC contraction. Moreover, the ECC phase had higher TO values, irrespective of velocity or repetitions. Some of the repetitions of the CON phase at 60o/s exhibited signifi cant difference between the BF and ST muscles. However, in general, the RMS values were not signifi cantly modifi ed by variations in velocity or type of contraction in the BF and ST muscles. Finally, the RMS/TO ratio was not linear under the experimental conditions studied, since, although TO values were different at different velocities and between CON and ECC contraction, whereas the RMS values remained steady. ABSTRACT O objetivo do presente estudo foi analisar o torque articular (TO) e a atividade eletromiográfi ca (EMG) dos músculos Bíceps Femoral (BF) cabe a longa e semitendíneo (ST) durante movimentos isocinéticos de fl ex o do joelho (a o concêntrica-CON e excêntrica-EXC), em diferentes velocidades de execu o, na posi o de decúbito ventral em atletas de futebol. Fizeram parte do estudo 14 atletas de futebol da equipe sub-20, da Associa o Atlética Ponte Preta, com idade entre 19 e 20 anos (71,24 ± 6,53 kg, 176,59 ± 6,44 cm). Os atletas realizaram uma série de cinco repeti es de fl ex o (a o CON e EXC) do joelho, em 3 velocidades (60, 180 e 300°/s), defi nidas anteriormente aleatoriamente. O intervalo de recupera o adotado entre as séries foi de 3 minutos. A atividade EMG foi coletada, utilizando-se eletrodos de superfície e os dado
Page 1 /11898
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.