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Search Results: 1 - 10 of 45304 matches for " Daniel Barbosa;Coelho "
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Evaluation of hydration status following soccer matches of different categories. DOI: http://dx.doi.org/10.5007/1980-0037.2012v14n3p276
Daniel Barbosa Coelho,Emerson Rodrigues Pereira,Elisa Couto Gomes,Leonardo Coelho
Revista Brasileira de Cineantropometria e Desempenho Humano , 2012,
Abstract: The purpose of this study was to evaluate the hydration status and thermoregulatory responses, during official soccer matches, of soccer players in different categories. The participants of the under-15 (U-15, n=36) and of the under-17 category (U-17, n=14) were placed into different groups according to the amount of time spent in the field: Main group; Partial group; Intermediate group; Control group. The thermoregulatory responses and hydration status were measured. The Main group and the Partial group presented significantly higher water intake, weight loss and sweat rate compared with the Intermediate and Control group (p<0.05). The under-17 players of the Main group had a larger weight difference pre and post match compared with the under-15 players of the same group (p<0.05). It was concluded that an official soccer match altered significantly the hydration status of the players, and it was related with the time spent in the match.
Evaluation of hydration status following soccer matches of different categories
Coelho, Daniel Barbosa;Pereira, Emerson Rodrigues;Gomes, Elisa Couto;Coelho, Leonardo;Soares, Danusa Dias;Silami-Garcia, Emerson;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007//1980-0037.2012v14n3p276
Abstract: the purpose of this study was to evaluate the hydration status and thermoregulatory responses, during official soccer matches, of soccer players in different categories. the participants of the under-15 (u-15, n=36) and of the under-17 category (u-17, n=14) were placed into different groups according to the amount of time spent in the field: main group; partial group; intermediate group; control group. the thermoregulatory responses and hydration status were measured. the main group and the partial group presented significantly higher water intake, weight loss and sweat rate compared with the intermediate and control group (p< 0.05). the under-17 players of the main group had a larger weight difference pre and post match compared with the under-15 players of the same group (p< 0.05). it was concluded that an official soccer match altered significantly the hydration status of the players, and it was related with the time spent in the match.
Intensity of real competitive soccer matches and differences among player positions. DOI: 10.5007/1980-0037.2011v13n5p341
Daniel Barbosa Coelho,Lucas ávila Mortimer,Luciano Antonacci Condessa,Rodrigo Figueiredo Morandi
Revista Brasileira de Cineantropometria e Desempenho Humano , 2011,
Abstract: Most investigations on soccer match intensity have evaluated friendly, simulated or a small number of games on a recreational basis or including a small number of players. There are no studies investigating real competitive situations including a considerable number of athletes and games or differences among player positions using heart rate as an intensity parameter. The aim of this study was to determine Brazilian soccer game intensity (GI) during official competitive matches and to compare GI among different player positions. Heart rate (HR) was measured in 26 under-17 (U-17) and 18 under-20 (U-20) soccer players (age 16.38 ± 0.5 and 18.24 ± 0.66 years, respectively) during 14 and 15 official games, respectively. Individual maximal heart rate (HRmax) and anaerobic threshold (AT) HR were evaluated in field tests. GI defined as %HRmax was monitored considering five intensity zones ranging from 1 = < 70% HRmax to 5 = 95-100% HRmax. Mean GI and AT intensity were 84.4 ± 5.1 and 86.3 ± 4.0% HRmax for the U-17 category and 84.1 ± 4.1 and 87.0 ± 5.1% HRmax for the U-20 category, respectively. Wingbacks (WB) spent more time in zone 5 than forwards (FW) (p<0.05). Midfielders (MF) spent more time in zone 3 than all other players and in zone 4 than defenders and FW (p<0.05). Mean GI and AT intensity were similar. WB performed more maximum effort than FW. MF did not participate as much in maximum effort as did WB and FW.
Anaerobic threshold in different categories of soccer players
Daniel Barbosa Coelho,Lucas de ávila Carvalho Fleury Mortimer,Luciano Antonacci Condessa,Danusa Dias Soares
Revista Brasileira de Cineantropometria e Desempenho Humano , 2009,
Abstract: Different variables can be used for the identification and monitoring of aerobic capacity in collective sports, with the anaerobic threshold (AT) being commonly used in long-duration team sports such as soccer, basketball, and handball. The aim of this study was to determine AT intensity in different categories of soccer players by evaluating running speed, heart rate (HR) and percent maximum HR (%HRmax), and to compare these intensities between three soccer categories. Nineteen U-17, 12 U-20 and 14 professional players volunteered for this study. The AT was defined as the exercise intensity at which blood lactate reaches a concentration of 4 mM (OBLA). AT was determined in a field test consisting of two to five 1000-m runs at constant speed. HR and blood lactate concentration recorded during the test were analyzed bylinear interpolation. The running speed, HR and %HRmax at OBLA were determined. HRmax was higher in U-17 players (202 ± 7 bpm) than in professional players (193 ± 10 bpm) (p<0.05). AT expressed as %HRmax was lower in the U-17 (87.0 ± 1.1) and U-20 (86.3 ± 0.8) categories when compared to the professional category (91.2 ± 1.1) (p<0.05). Mean AT was 87% HRmax. No differences between categories were observed when AT was expressed as absolute HR values (bpm) or running speed. The intensity of AT is considered to be high in this group, with professional players presenting a higher AT than U-17 and U-20 players.
Creatine kinase kinetics in professional soccer players during a competitive season. DOI: 10.5007/1980-0037.2011v13n3p189
Daniel Barbosa Coelho,Rodrigo Figueiredo Morandi,Marco Aurélio Anuncia??o de Melo,Emerson Silami Garcia
Revista Brasileira de Cineantropometria e Desempenho Humano , 2011,
Abstract: Serum creatine kinase (CK) concentration has been widely used as an indicator of skeletal muscle damage in sports. However, there are no longitunal studies on post-game CK kinetics in Soccer during a competitive season. The aim of this study was to evaluate serum CK kinetics in professional Soccer players at different post-game times during a competitive season without training interruption. Seventeen professional soccer players (age: 22.2±3.1 years, height: 179±6.0 cm, body fat percentage: 9.5±1.1, and 67.0±3.5 mL O2/kg/min) were evaluated over a period of 3 months of the national championship. Serum CK concentration was measured before the beginning of the season (baseline) and at four different times after a soccer game (post-1: 12-20 h, post-2: 36-48 h, post-3: 60-65 h, and post-4: 90-110 h). Plasma CK concentrations were higher at all times when compared to baseline (p<0.05). Post-2 CK concentration was lower than post-1 and higher than post-3 and -4 (p<0.05), with no significant differences between post-3 and post-4. In conclusion, serum CK kinetics was influenced by the training routine of the soccer players, with a peak between 12 and 20 h after the game, returning to normal within 60-65 h. This procedure can be used to monitor the recovery state of athletes and game and training intensities.
Energy demand and heart rate evaluation at different phases during a match along an official soccer competition
Coelho, Daniel Barbosa;Coelho, Leonardo Gomes;Mortimer, Lucas ávila Fleury;Hudson, Alexandre Sérvulo Ribeiro;Marins, Jo?o Carlos Bouzas;Soares, Danusa Dias;Garcia, Emerson Silami;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n4p419
Abstract: the purpose of the present study was to analyze the energy expenditure and heart rate (hr), expressed as mean and maximal heart rate (hrmax), along matches of an official soccer competition. methods: eighteen under-20 year old (u-20) soccer players from a first-division brazilian soccer team were evaluated during 15 matches. the relationship between hr and oxygen uptake (hr/vo2 relationship) was established, and a linear regression equation was developed for each individual player participating in the study. this equation was then used to determine the oxygen uptake and the corresponding energy expenditure based on the hr values measured during the games. the hr was recorded at 5-second intervals, which were clustered in phases of 15 minutes (0-15 min, 15-30 min e 30-45 min) for each half time (first half [fh] and second half [sh]). results: the players' oxygen uptake was 308.3 ± 11.9 lo2/game and the energy expenditure was 17.3±1.3 kcal.min-1 and 1,542.9±125.1 kcal/game. the results showed that there were significant differences between the hr and hrmax identified in the first half (fh 15-30 min) compared to the second half (sh 0-15 min and sh 30-45 min), and at fh 30-45 min compared to sh 0-15 min (p<0.05). conclusions: we concluded that soccer should be considered as an extremely arduous activity for u-20 players due to the high energy expenditure during the matches of an official championship. we also concluded that, during soccer games with young players, fh 15-30 min could be considered the most intense phase, because the highest values of hr and hrmax usually occur at this phase.
Cinética da creatina quinase em jogadores de futebol profissional em uma temporada competitiva
Coelho, Daniel Barbosa;Morandi, Rodrigo Figueiredo;Melo, Marco Aurélio Anuncia??o de;Silami-Garcia, Emerson;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2011, DOI: 10.5007/1980-0037.2011v13n3p189
Abstract: serum creatine kinase (ck) concentration has been widely used as an indicator of skeletal muscle damage in sports. however, there are no studies on post-game ck kinetics in soccer during a competitive season. the aim of this study was to evaluate serum ck kinetics in professional soccer players at different post-game times during a competitive season without training interruption. seventeen professional soccer players (age: 22.2±3.1 years, height: 179±6.0 cm, body fat percentage: 9.5±1.1, and 67.0±3.5 ml o2/kg/min) were evaluated over a period of 3 months of the national championship. serum ck concentration was measured before the beginning of the season (baseline) and at four different times after a soccer game (post-1: 12-20 h, post-2: 36-48 h, post-3: 60-65 h, and post-4: 90-110 h). plasma ck concentrations were higher at all times when compared to baseline (p<0.05). post-2 ck concentration was lower than post-1 and higher than post-3 and -4 (p<0.05), with no significant differences between post-3 and post-4. in conclusion, serum ck kinetics was influenced by the training routine of the soccer players, with a peak between 12 and 20 h after the game, returning to normal within 60-65 h. this procedure can be used to monitor the recovery state of athletes and game and training intensities.
Plasma Treatment Maintains Surface Energy of the Implant Surface and Enhances Osseointegration
Fernando P. S. Guastaldi,Daniel Yoo,Charles Marin,Ryo Jimbo,Nick Tovar,Darceny Zanetta-Barbosa,Paulo G. Coelho
International Journal of Biomaterials , 2013, DOI: 10.1155/2013/354125
Abstract: The surface energy of the implant surface has an impact on osseointegration. In this study, 2 surfaces: nonwashed resorbable blasting media (NWRBM; control) and Ar-based nonthermal plasma 30 days (Plasma 30 days; experimental), were investigated with a focus on the surface energy. The surface energy was characterized by the Owens-Wendt-Rabel-Kaelble method and the chemistry by X-ray photoelectron spectroscopy (XPS). Five adult beagle dogs received 8 implants ( per surface, per tibia). After 2 weeks, the animals were euthanized, and half of the implants ( ) were removal torqued and the other half were histologically processed ( ). The bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO) were evaluated on the histologic sections. The XPS analysis showed peaks of C, Ca, O, and P for the control and experimental surfaces. While no significant difference was observed for BIC parameter ( ), a higher level for torque ( ) and BAFO parameter ( ) was observed for the experimental group. The surface elemental chemistry was modified by the plasma and lasted for 30 days after treatment resulting in improved biomechanical fixation and bone formation at 2 weeks compared to the control group. 1. Introduction The interaction between the implant surface and the living body begins soon after the placement of the biomaterial in the body, and it has always been a challenge to determine the optimal modification to accelerate the biologic events which lead to faster osseointegration [1–3]. Since it has been proven that moderately rough surfaces outperform the turned surfaces [4–8], recent research has focused on further modifications that could possibly increase the bioactivity of the implant [9]. Thus, some of the state-of-the-art research has shifted to chemically modify moderately rough surfaces, which have been indicated to generate synergetic effects [10, 11]. Furthermore, the surface energy is another important factor involved in the regulation of osteogenesis. It has been said that depending on the surface energy, the surface state can either be hydrophilic or hydrophobic [12]. The energy state of the implant depends on the type of biomaterial, the handling during manufacturing, the mode of cleaning, sterilization, and needless to say, the handling of the implant during surgical procedure [13, 14]. In general, when the surface is positively charged, the surface turns hydrophilic and some of the plasma proteins essential for the initial osteogenic interactions adsorb to hydrophilic surfaces [15–17]. It has been suggested that the charge of the implant
Intensity of real competitive soccer matches and differences among player positions
Coelho, Daniel Barbosa;Mortimer, Lucas ávila;Condessa, Luciano Antonacci;Morandi, Rodrigo Figueiredo;Oliveira, Bernardo Moreira;Marins, Jo?o Carlos Bouzas;Soares, Danusa Dias;Garcia, Emerson Silami;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2011, DOI: 10.5007/1980-0037.2011v13n5p341
Abstract: most investigations on soccer match intensity have evaluated friendly, simulated or a small number of games on a recreational basis or including a small number of players. there are no studies investigating real competitive situations including a considerable number of athletes and games or differences among player positions using heart rate as an intensity parameter. the aim of this study was to determine brazilian soccer game intensity (gi) during official competitive matches and to compare gi among different player positions. heart rate (hr) was measured in 26 under-17 (u-17) and 18 under-20 (u-20) soccer players (age 16.38 ± 0.5 and 18.24 ± 0.66 years, respectively) during 14 and 15 official games, respectively. individual maximal heart rate (hrmax) and anaerobic threshold (at) hr were evaluated in field tests. gi defined as %hrmax was monitored considering five intensity zones ranging from 1 = < 70% hrmax to 5 = 95-100% hrmax. mean gi and at intensity were 84.4 ± 5.1 and 86.3 ± 4.0% hrmax for the u-17 category and 84.1 ± 4.1 and 87.0 ± 5.1% hrmax for the u-20 category, respectively. wingbacks (wb) spent more time in zone 5 than forwards (fw) (p<0.05). midfielders (mf) spent more time in zone 3 than all other players and in zone 4 than defenders and fw (p<0.05). mean gi and at intensity were similar. wb performed more maximum effort than fw. mf did not participate as much in maximum effort as did wb and fw.
Correla??o entre o desempenho de jogadores de futebol no teste de sprint de 30m e no teste de salto vertical
Coelho, Daniel Barbosa;Coelho, Leonardo Gomes Martins;Braga, Mário Lucio;Paolucci, Alexandre;Cabido, Christian Emmanuel Torres;Ferreira Junior, Jo?o Batista;Mendes, Thiago Teixeira;Prado, Luciano Sales;Garcia, Emerson Silami;
Motriz: Revista de Educa??o Física , 2011, DOI: 10.5016/1980-6574.2011v17n1p63
Abstract: the aim of the present study was to determine the association between the results in the counter movement jump (cmj) and the results in the first 10 meters, in the final 20 meters and the in the total 30 meters of a 30-meter sprint. one-hundred and sixty seven soccer players from the professional (n. 93) and under twenty (n. 74) categories, from a brazilian first division soccer club participated in the study. the sprint test consisted of a 30-meter run timed at the 10-meter and at the 30-meter marks. the jump capacity was assessed through the cmj. pearson's correlation (r) was used to determine the association between these variables. the significance level adopted was p<.05. the u-20 players presented faster v10 and slower v20 than the professionals (p<.05). the correlation (r) between cmj and v10, v20 and v30 were .239, .370 and .408, respectively, for the u20 group and .381, .381 and .470, respectively, for the professional group. evaluating the two categories together the correlation were; r= 0,293, 0,386 and 0,441 to v10, v20 and v30 respectively. the correlation between cmj and v10 was weak and moderate for v20 and v30. in the professional category the correlation between cmj and all the other parameters was moderate. it is probable that higher correlation values for cmj and v10 for the professionals could be attributed to specific training effects.
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