Revista da Educação Física/UEM, Vol. 22, No 1 (2011)
Avaliação e comparação das respostas da percepção subjetiva de esforço e concentração de lactato em uma competição oficial de karate
Vinicius Milanez, Manoel Lima, Luiz Perandini, Cassio Gonçalves, Emerson Franchini
Resumo
Diversos indicadores fisiológicos podem ser usados para estimar a intensidade do esforço, tais como frequência cardíaca (FC), consumo de oxigênio (VO2), concentração de lactato ([Lac]) e percepção subjetiva de esforço (PSE). O objetivo do estudo foi avaliar e comparar as respostas da PSE e da [Lac] em uma competição oficial de caratê. Sete atletas participaram de uma competição interestadual, na qual foram mensuradas as variáveis [Lac] e a PSE mediante duas escalas, Borg 6-20 (PSE6-20) e CR-10 (PSECR-10), para estimar a intensidade do esforço. Os valores médios ± desvios padrão encontrados foram: pico de [Lac] = 7,6 ± 1,4 mM, PSE6-20 = 12 ± 3 e PSECR-10 = 3 ± 1. Foram encontradas correlação forte entre PSECR-10 e [Lac]pico (r = 0,82) e correlação moderada entre PSE6-20 e [Lac]pico (r = 0,62). Com base nos resultados observou-se que ambas as escalas apresentadas em momentos diferentes, podem ser aplicadas de maneira eficiente para mensurar o esforço realizado por caratecas durante a competição.
http://periodicos.uem.br/ojs/index.php/RevEducFis/article/view/8058/7523
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Quem sou eu
- Emerson Franchini
- 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
- ► 2012 (168)
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terça-feira, 26 de julho de 2011
segunda-feira, 25 de julho de 2011
Densidade mineral óssea e perda de peso
J Bone Miner Metab. 2011 Jul 20. [Epub ahead of print]
Weight regulation and bone mass: a comparison between professional jockeys, elite amateur boxers, and age, gender and BMI matched controls.
Dolan E, Crabtree N, McGoldrick A, Ashley DT, McCaffrey N, Warrington GD.
School of Health and Human Performance, Dublin City University, Glasnevin, Dublin 9, Ireland, eimeardol@gmail.com.
Abstract
The aim of this study was to compare bone mass between two groups of jockeys (flat: n = 14; national hunt: n = 16); boxers (n = 14) and age, gender and BMI matched controls (n = 14). All subjects underwent dual energy X-ray absorptiometry (DXA) scanning for assessment of bone mass, with measurements made of the total body, vertebra L2-4 and femoral neck. Body composition and the relative contribution of fat and lean mass were extrapolated from the results. Data were analysed in accordance with differences in body composition, in particular, height, lean mass, fat mass and age. Both jockey groups were shown to display lower bone mass than either the boxers or control group at a number of sites including total body bone mineral density (BMD) (1.019 ± 0.06 and 1.17 ± 1.05 vs. 1.26 ± 0.01 and 1.26 ± 0.06 g cm(-2) for flat, national hunt, boxer and control, respectively), total body bone mineral content (BMC) less head, L2-4 BMD and femoral neck BMD and BMC (p < 0.05). Regression analysis revealed that lean mass and height were the primary predictors of total body BMC, although additional group-specific influences were present which reduced bone mass in the flat jockey group and enhanced it in the boxers (R (2) = 0.814). Reduced bone mass in jockeys may be a consequence of reduced energy availability in response to chronic weight restriction and could have particular implications for these athletes in light of the high risk nature of the sport. In contrast, the high intensity, high impact training associated with boxing may have conveyed an osteogenic stimulus on these athletes.
Weight regulation and bone mass: a comparison between professional jockeys, elite amateur boxers, and age, gender and BMI matched controls.
Dolan E, Crabtree N, McGoldrick A, Ashley DT, McCaffrey N, Warrington GD.
School of Health and Human Performance, Dublin City University, Glasnevin, Dublin 9, Ireland, eimeardol@gmail.com.
Abstract
The aim of this study was to compare bone mass between two groups of jockeys (flat: n = 14; national hunt: n = 16); boxers (n = 14) and age, gender and BMI matched controls (n = 14). All subjects underwent dual energy X-ray absorptiometry (DXA) scanning for assessment of bone mass, with measurements made of the total body, vertebra L2-4 and femoral neck. Body composition and the relative contribution of fat and lean mass were extrapolated from the results. Data were analysed in accordance with differences in body composition, in particular, height, lean mass, fat mass and age. Both jockey groups were shown to display lower bone mass than either the boxers or control group at a number of sites including total body bone mineral density (BMD) (1.019 ± 0.06 and 1.17 ± 1.05 vs. 1.26 ± 0.01 and 1.26 ± 0.06 g cm(-2) for flat, national hunt, boxer and control, respectively), total body bone mineral content (BMC) less head, L2-4 BMD and femoral neck BMD and BMC (p < 0.05). Regression analysis revealed that lean mass and height were the primary predictors of total body BMC, although additional group-specific influences were present which reduced bone mass in the flat jockey group and enhanced it in the boxers (R (2) = 0.814). Reduced bone mass in jockeys may be a consequence of reduced energy availability in response to chronic weight restriction and could have particular implications for these athletes in light of the high risk nature of the sport. In contrast, the high intensity, high impact training associated with boxing may have conveyed an osteogenic stimulus on these athletes.
Burn out em treinadores de judô
Assunto interessante, relevante e pouco estudado...
J Occup Health. 2011 Jul 20. [Epub ahead of print]
Burnout among Judo Coaches in Turkey.
Gencay S, Gencay OA.
Department of Physical Education and Sport Teaching, School of Physical Education and Sport, Kahramanmaras Sutcu Imam University.
Abstract
Objectives: The purpose of this study was to determine the prevalence of professional burnout experienced by Turkish judo coaches and to compare possible differences in the three burnout dimensions based on coaching experience in years and satisfaction status of their sport administrators. Methods: The data were obtained by using a three-section questionnaire including a socio demographic data form and the Turkish version of the Maslach Burnout Inventory from 65 judo coaches working in the Turkish Judo and Kurash Federation. Results: In the analysis of data, descriptive statistics (mean and standard deviation) and one-way ANOVA tests were used. This study showed that judo coaches have medium level burnout experience. The results also showed that there were significant differences in the emotional exhaustion levels of judo coaches based on coaching experience in years and satisfaction status from their sport administrators. Conclusions: Burnout appears to be a problematic issue for judo coaches. When coaches begin to feel emotionally depleted, they distance themselves from athletes, and experience a reduced sense of meaning about their work; it is likely to affect the quality of the athletic experience for both the coach and the athletes.
J Occup Health. 2011 Jul 20. [Epub ahead of print]
Burnout among Judo Coaches in Turkey.
Gencay S, Gencay OA.
Department of Physical Education and Sport Teaching, School of Physical Education and Sport, Kahramanmaras Sutcu Imam University.
Abstract
Objectives: The purpose of this study was to determine the prevalence of professional burnout experienced by Turkish judo coaches and to compare possible differences in the three burnout dimensions based on coaching experience in years and satisfaction status of their sport administrators. Methods: The data were obtained by using a three-section questionnaire including a socio demographic data form and the Turkish version of the Maslach Burnout Inventory from 65 judo coaches working in the Turkish Judo and Kurash Federation. Results: In the analysis of data, descriptive statistics (mean and standard deviation) and one-way ANOVA tests were used. This study showed that judo coaches have medium level burnout experience. The results also showed that there were significant differences in the emotional exhaustion levels of judo coaches based on coaching experience in years and satisfaction status from their sport administrators. Conclusions: Burnout appears to be a problematic issue for judo coaches. When coaches begin to feel emotionally depleted, they distance themselves from athletes, and experience a reduced sense of meaning about their work; it is likely to affect the quality of the athletic experience for both the coach and the athletes.
quarta-feira, 20 de julho de 2011
Demanda energética no TKD
Eur J Appl Physiol. 2011 Jul 17. [Epub ahead of print]
Energy demands in taekwondo athletes during combat simulation.
Campos FA, Bertuzzi R, Dourado AC, Santos VG, Franchini E.
Martial Arts and Combat Sports Research Group, School of Physical Education and Sport, University of São Paulo (USP), Av. Prof. Mello de Moraes, 65, Butantã, São Paulo, SP, 05508-900, Brazil.
Abstract
The purpose of this study was to investigate energy system contributions and energy costs in combat situations. The sample consisted of 10 male taekwondo athletes (age: 21 ± 6 years old; height: 176.2 ± 5.3 cm; body mass: 67.2 ± 8.9 kg) who compete at the national or international level. To estimate the energy contributions, and total energy cost of the fights, athletes performed a simulated competition consisting of three 2 min rounds with a 1 min recovery between each round. The combats were filmed to quantify the actual time spent fighting in each round. The contribution of the aerobic (W (AER)), anaerobic alactic (W (PCR)), and anaerobic lactic [Formula: see text] energy systems was estimated through the measurement of oxygen consumption during the activity, the fast component of excess post-exercise oxygen consumption, and the change in blood lactate concentration in each round, respectively. The mean ratio of high intensity actions to moments of low intensity (steps and pauses) was ~1:7. The W (AER), W (PCR) and [Formula: see text] system contributions were estimated as 120 ± 22 kJ (66 ± 6%), 54 ± 21 kJ (30 ± 6%), 8.5 kJ (4 ± 2%), respectively. Thus, training sessions should be directed mainly to the improvement of the anaerobic alactic system (responsible by the high-intensity actions), and of the aerobic system (responsible by the recovery process between high-intensity actions).
Energy demands in taekwondo athletes during combat simulation.
Campos FA, Bertuzzi R, Dourado AC, Santos VG, Franchini E.
Martial Arts and Combat Sports Research Group, School of Physical Education and Sport, University of São Paulo (USP), Av. Prof. Mello de Moraes, 65, Butantã, São Paulo, SP, 05508-900, Brazil.
Abstract
The purpose of this study was to investigate energy system contributions and energy costs in combat situations. The sample consisted of 10 male taekwondo athletes (age: 21 ± 6 years old; height: 176.2 ± 5.3 cm; body mass: 67.2 ± 8.9 kg) who compete at the national or international level. To estimate the energy contributions, and total energy cost of the fights, athletes performed a simulated competition consisting of three 2 min rounds with a 1 min recovery between each round. The combats were filmed to quantify the actual time spent fighting in each round. The contribution of the aerobic (W (AER)), anaerobic alactic (W (PCR)), and anaerobic lactic [Formula: see text] energy systems was estimated through the measurement of oxygen consumption during the activity, the fast component of excess post-exercise oxygen consumption, and the change in blood lactate concentration in each round, respectively. The mean ratio of high intensity actions to moments of low intensity (steps and pauses) was ~1:7. The W (AER), W (PCR) and [Formula: see text] system contributions were estimated as 120 ± 22 kJ (66 ± 6%), 54 ± 21 kJ (30 ± 6%), 8.5 kJ (4 ± 2%), respectively. Thus, training sessions should be directed mainly to the improvement of the anaerobic alactic system (responsible by the high-intensity actions), and of the aerobic system (responsible by the recovery process between high-intensity actions).
domingo, 17 de julho de 2011
quarta-feira, 13 de julho de 2011
Defesa de Mestrado na EEFE
Candidata: Ursula Ferreira Julio
Título da dissertação: Home-advantage no judô: estudo sobre o sistema de ranqueamento mundial
Defesa pública
Data: 25/07/2011, 14h
Local: sala 57 da EEFE-USP
Orientador e Presidente da Comissão: Emerson Franchini (EEFE-USP)
Membros da Comissão Examinadora:
Prof. Dr. Luciano Basso (EEFE-USP)
Prof. Dr. Fabrício Boscolo Del Vecchio (UFPel)
Membros Suplentes
Prof. Dr. Alexandre Moreira (EEFE-USP)
Prof. Dr. Luiz Eduardo Pinto Bastos Tourinho Dantas (EEFE-USP)
Profa. Dra. Cibele Maria Russo Noveli (ICMC-USSP)
Título da dissertação: Home-advantage no judô: estudo sobre o sistema de ranqueamento mundial
Defesa pública
Data: 25/07/2011, 14h
Local: sala 57 da EEFE-USP
Orientador e Presidente da Comissão: Emerson Franchini (EEFE-USP)
Membros da Comissão Examinadora:
Prof. Dr. Luciano Basso (EEFE-USP)
Prof. Dr. Fabrício Boscolo Del Vecchio (UFPel)
Membros Suplentes
Prof. Dr. Alexandre Moreira (EEFE-USP)
Prof. Dr. Luiz Eduardo Pinto Bastos Tourinho Dantas (EEFE-USP)
Profa. Dra. Cibele Maria Russo Noveli (ICMC-USSP)
sábado, 9 de julho de 2011
InYo é reformulado e lançado; vejam novo número
O periódico passa ser nova opção de leitura e submissão
http://ejmas.com/jalt/jaltframe.htm
Em breve o Journal of Combative Sports também será reeditado.
http://ejmas.com/jalt/jaltframe.htm
Em breve o Journal of Combative Sports também será reeditado.
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