Visitem

http://www.olimpiadas2016.usp.br/

Sucesso competitivo e respostas neuroendócinas em atletas de luta olímpica

J Strength Cond Res. 2010 Nov 24. [Epub ahead of print]
Relationships Between Competitive Wrestling Success and Neuroendocrine Responses.
Fry AC, Schilling BK, Kraemer WJ.
1Applied Physiology Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, Kansas; 2Human Performance Laboratories, Department of Health and Sport Sciences, The University of Memphis, Memphis, Tennessee; and 3Human Performance Laboratory, Department of Kinesiology, The University of Connecticut, Storrs, Connecticut.

Abstract

Fry, AC, Schilling, BK, and Kraemer, WJ. Relationships between competitive wrestling success and neuroendocrine responses J Strength Cond Res 24(X): 000-000, 2010-Previous research on wrestling suggests winning wrestlers will have a greater increase in testosterone (Tes) than losing wrestlers, although the physiological mechanism is unknown. To determine the role of the sympathetic nervous system in this phenomenon, 12 male wrestlers from an National Collegiate Athletic Association Division I program wrestled 5 matches over a 2-day period. Serum samples were collected pre (Pre) and immediately postmatch (Post) for the determination of Tes, cortisol (Cort), Tes/Cort, and epinephrine (Epi). The subjects had a combined record of 34 wins, 31 losses, and 4 ties. Testosterone increased (p < 0.05) for both winners and losers, but the increase was greater for winners (X ± SE; nmol·L; winners, pre = 16.4 ± 1.2, post = 23.2 ± 1.5; losers, pre = 14.8 ± 1.0, post = 19.4 ± 1.2). Cortisol and Epi increased similarly for both winners and losers, whereas the Tes/Cort ratio was unaltered at any time. Relative changes in the Epi response (%Δ) for losers were correlated to %ΔTes (r = 0.91), whereas winners did not exhibit similar relationships (r = 0.09). These data suggest that winning wrestlers may use a different regulatory mechanism for their acute Tes responses than losers who appear to depend on sympathetic regulation. Additionally, these data from humans support the biosocial theory of status and the challenge hypothesis developed for competing males in other species.

Perfil dos atletas de taekwondo em Beijing

J Can Chiropr Assoc. 2010 Dec;54(4):243-9.
A profile of 2008 Olympic Taekwondo competitors.
Kazemi M, Perri G, Soave D.
Associate Professor, Canadian Memorial Chiropractic College, Toronto, Ontario, Canada; email: mkazemi@cmcc.ca.

Abstract

The purpose of this study was to identify the characteristics of Olympic medal winners (gold, silver, bronze) who competed in the 2008 Beijing Olympic Games and compare these characteristics to those who competed but did not earn medals. We have also descriptively analysed the 2008 data in comparison to the 2004 data (Kazemi et al., 2009), and 2000 data (Kazemi et al., 2006) and summarized changes that were identified. This study as well as the last two studies did not find any statistically significant differences between winners and non-winners with regards to average age, weight, height and BMI. There are, however, some trends that were observed. Female winners were slightly younger, shorter, with greater BMI's versus non-winners. There was a significant decrease in frequency of warnings from 2004 to 2008. Unlike 2004, the 2008 Olympic Taekwondo competitors used more defensive kicks to score. These suggest a shift from aggressive tactics to score to a more conservative one.

Suplementação de ácidos graxos e estresse oxidativo em judocas

Int J Sport Nutr Exerc Metab. 2010 Dec;20(6):496-506.

Effect of 6 Weeks of n-3 Fatty-Acid Supplementation on Oxidative Stress in Judo Athletes.
Filaire E, Massart A, Portier H, Rouveix M, Rosado F, Bage AS, Gobert M, Durand D.

Unité de Formation en Sciences et Techniques des Activités Physiques et Sportives, Orleans, France.

Abstract

The aim of this investigation was to assess the effects of 6 wk of eicosapentanoic acid (EPA) and docosahexanoic acid (DHA) supplementation on resting and exercise-induced lipid peroxidation and antioxidant status in judoists. Subjects were randomly assigned to receive a placebo or a capsule of polyunsaturated fatty acids (PUFAs; 600 mg EPA and 400 mg DHA). Blood samples were collected in preexercise and postexercise conditions (judo-training session), both before and after the supplementation period. The following parameters were analyzed: α-tocopherol, retinol, lag phase , maximum rate of oxidation (Rmax) during the propagating chain reaction, maximum amount of conjugated dienes (CDmax) accumulated after the propagation phase, nitric oxide (NO) and malondyaldehide (MDA) concentrations, salivary glutathione peroxidase activity, and the lipid profile. Dietary data were collected using a 7-day dietary record. A significant interaction effect between supplementation and time (p < .01) on triglycerides was noted, with values significantly lower in the n-3 long-chain-PUFA (LCPUFA) group after supplementation than in the placebo group. Significant interaction effects between supplementation and time on resting MDA concentrations and Rmax were found (p = .03 and p = .04, respectively), with elevated values in the n-3 LCPUFA group after supplementation and no change in the placebo group's levels. The authors observed a significantly greater NO and oxidative-stress increase with exercise (MDA, Rmax, CDmax, and NO) in the n-3 LCPUFA group than with placebo. No main or interaction effects were found for retinol and α-tocopherol. These results indicate that supplementation with n-3 LCPUFAs significantly increased oxidative stress at rest and after a judo-training session.

Enquanto isso, em Bruxelas...

Dica do Fabrício:
©Journal of Sports Science and Medicine (2010) 9, 528-537

http://www.jssm.org/vol9/n4/1/v9n4-1pdf.pdf
Received: 20 May 2010 / Accepted: 06 August 2010 / Published (online): 01 December 2010
The social-psychological outcomes of martial arts practise among youth: A review
Jikkemien Vertonghen 􀀍 and Marc Theeboom
Vrije Universiteit Brussel, Belgium
Abstract

Martial arts involvement among the youth has been described in controversial terms. Studies regarding the effects of martial arts practise on youth show contrasting images. While some refer to enhanced personal and social opportunities for those that participate, others warn against increased levels of aggressiveness and antisocial behavior among its participants. The aim of the present review is to provide, firstly, an overview of the major findings of studies concerning the social-psychological outcomes of martial arts practise. Secondly, the limitations of those studies are discussed. From more than 350 papers, collected during a two-year lasting literature study, 27 papers met all criteria to be included in this study. This review revealed that even though a considerable amount of research on socialpsychological outcomes of martial arts practise has been conducted over the years, to date, it has not brought clarity in the existing duality regarding the possible effects of martial arts involvement. It is proposed that a better understanding can be provided if specific influential factors are taken into account in future research (i.e., participants’ characteristics, type of guidance, social context and structural qualities of the sport).

Exame Geral de Qualificação

Características morfo-funcionais e demanda energética em situação simulada de luta em atletas de taekwondo
Candidato: Fábio Angioluci Diniz Campos
Comissão Examinadora:
Presidente: Prof. Dr. Emerson Franchini
Membros Titulares:
Profa. Dra. Maria Augusta Peduti Dal'Molin Kiss (EEFE-USP)
Prof. Dr. Luiz Cláudio Reeberg Stanganelli (UEL)
Membros suplentes:
Prof. Dr. Alexandre Moreira (EEFE-USP)
Prof. Dr. Antonio Carlos Dourado (UEL)
Local: sala 57 da EEFE-USP
Data: 17/12/2010
Horário: 14h