Pesquisar este blog



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, 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.

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.

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.