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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

sábado, 26 de janeiro de 2013

Análise de capacetes no TKD

 2013 Jan 24. [Epub ahead of print]

Safety performance evaluation of taekwondo headgear.


Department of Physical Education, Chung-Ang University, Anseong, Republic of Korea.



With over 20 years of taekwondo concussion research highlighting the high incidence of injury, previous studies recommend an investigation of headgear impact attenuation performance.


To examine impact attenuation differences between the anterior, posterior and sides of selected taekwondo headgear brands.




Biomechanics laboratory.


Five different commercially available taekwondo headgear were selected for impact testing. A 50th percentile Hybrid II Dummy Crash Test head and neck was fitted with the selected helmet and was bolted to a 25 kg steel torso-like structure. Each headgear model was impacted eight times to the anterior, posterior and sides by a 6.75 kg bowling ball at three heights to produce 52.25, 85 and 144 J strikes.


Resultant head linear acceleration.


Two-way (Helmet×Location) mixed analysis of variance with repeated measures on the second factor was performed to determine the differences between headgear by location of impact. There was a two-way (Helmet×Location) interaction for acceleration (η(2)=0.368).


Taekwondo headgear manufacturers and sport governing bodies must consider improving the design of especially anterior helmet properties.

Genética e judô

 2013 Jan 23. [Epub ahead of print]

ACTN3 R577X Polymorphism is not Associated with Elite Judo Athletic Status.


INEF, Universidad Politécnica de Madrid, Spain.


We compared ACTN3 R577X genotype/allele frequencies in the majority of all-times best Spanish judo male athletes (n=108) and 343 ethnically-matched non-athletic men. No between-group differences were found in allele (P=0.077) or genotype distributions (P=0.178). Thus, the R577X polymorphism was not significantly associated with the status of being an elite judo athlete, at least in the Spanish population. The contribution of genetics to sports-related phenotype traits is undeniable with some genotypes, of which ACTN3 R577X is currently the leading candidate, partly allowing to distinguish individuals predisposed to either 'endurance' or more 'power' sports. However, few athletic events can be categorized as 'purely' power or endurance-based. Although genetic testing (i.e. of ACTN3 R577X) is already being marketed to predict sports talents and potentials of young children, its usefulness is still questionable, at least in competitive judo.