Efeito do grau de desidratação em respostas imunes após treino de judô de atletas do sexo feminino

Luminescence. 2012 Feb 24. doi: 10.1002/bio.2349. [Epub ahead of print]

Effects of dehydration on immune functions after a judo practice session.

Chishaki T, Umeda T, Takahashi I, Matsuzaka M, Iwane K, Matsumoto H, Ishibashi G, Ueno Y, Kashiwa N, Nakaji S.

Source

Department of Social Medicine, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, 036-8562, Japan; Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, 790-8587, Japan. nakaji@cc.hirosaki-u.ac.jp.

Abstract

We investigated the effects of dehydration after a judo practice session on player muscle and immune functions. Subjects included 25 female university judoists. Investigations were performed before and after 2.5 h of regular judo practice. Body composition, serum enzymes (myogenic enzymes, immunoglobulins and complements), neutrophils counts, reactive oxygen species (ROS) production capability, and phagocytic activity (PA) were measured. Subjects were divided into two groups according to level of dehydration after practice (mild dehydration and severe dehydration groups) and results were compared. Creatine kinase was found to increase significantly after practice. In addition, neutrophil count also increased significantly after practice in both groups. The changing ratios of IgA, IgG and C3 observed in the mild dehydration group were significantly higher than those in the severe dehydration group. In the severe dehydration group, post-practice PA/neutrophil had decreased significantly. Significant positive correlations were found between severity of dehydration and changing ratios of IgA, IgG, IgM, C3, C4 and ROS production capabilities, whereas no significant association was seen with PA and/or serum SOD activity. These results suggest that dehydration resulted in immunosuppression, including decreased neutrophil function.

Saudação inicial do curso "Atualização no ensino do judô para crianças: pesquisas e aplicações", ministrado pelo Prof. Dr. Michel Calmet no Centro de Práticas Esportivas da Universidade de São Paulo, contando com 35 participantes de diversas localidades. O apoio do CNPq possibilitou a gratuidade do curso. Os membros do Grupo de Estudos e Pesquisas em Lutas, Artes Marciais e Modalidades Esportivas de Combate da EEFE-USP agradecem a presença de todos.

Photo by: Fabrício Boscolo Del'Vecchio

Teste aeróbio específico para o karate

J Strength Cond Res. 2012 Feb 15. [Epub ahead of print]


Reliability and construct validity of the karate specific aerobic test (KSAT).

Chaabène H, Hachana Y, Franchini E, Mkaouer B, Montassar M, Chamari K.

1Research Unit, Analysis and Evaluation of factors affecting the sport performance, Higher Institute of Sports and Physical Education, Ksar said, Tunisia; 2Tunisian Research Laboratory 'Sport Performance Optimisation', National Centre of Medicine and Science in Sport, Tunisia; 3 Higher Institute of Sports and Physical Education, Manouba University, Tunis, Tunisia; 4Martial Arts and Combat Sports Research Group, School of Physical Education and Sport, University of Sao Paulo, Sao Paulo, Brazil.


Abstract

The aim of this study was to examine absolute and relative reliability and external responsiveness of the Karate specific aerobic test (KSAT). This study comprised 43 male karatekas, 19 of them participated in the first study to establish test-retest reliability and 40, selected on the bases of their karate experience and level of practice, participated in the second study to identify external responsiveness of the KSAT. The latter group was divided into two categories: national level group (Gn) and regional level group (Gr). Analysis showed excellent test-retest reliability of time to exhaustion (TE), with intraclass correlation coefficient ICC(3,1) >0.90, standard error of measurement SEM <5%: (3.2%) and mean difference (bias) ± the 95% limits of agreement: -9.5±78.8 s. There was a significant difference between test-retest session in peak lactate concentration (Peak [La]) (9.12±2.59 mmol.l vs 8.05±2.67 mmol.l; p<0.05), but not in peak heart rate (HRpeak) and rating of perceived exertion (RPE) (196±9 bpm vs 194±9 bpm and 7.6±0.93 vs 7.8±1.15; p>0.05), respectively. National level karate athletes (1032±101-s) were better than regional level (841±134-s) on time to exhaustion (TE) performance during KSAT (p<0.001). Thus, KSAT provided good external responsiveness. The area under the receiver operator characteristics (ROC) curve was >0.70 (0.86; CI 95%: 0.72-0.95). Significant difference was detected on Peak [La] between national (6.09±1.78mmol.l) and regional level (8.48±2.63mmol.l) groups, but not in HRpeak (194±8 bpm vs 195±8 bpm) and RPE (7.57±1.15 vs 7.42±1.1) respectively. The result of this study indicates that KSAT provides excellent absolute and relative reliabilities. The KSAT can effectively distinguish karate athletes of different competitive levels. Thus, the KSAT may be suitable for field assessment of aerobic fitness of karate practitioners.

International Journal of Wrestling Science

Destaque para a lista das publicações envolvendo wrestling em 2011 (o autor publica essas listas desde 2005; para quem não tem tempo para buscar, já está tudo selecionado):

http://inwr-wrestling.com/wp-content/uploads/2012/02/Vol-1-Supplement-ALL.pdf

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http://www.faperj.br/boletim_interna.phtml?obj_id=7914

Vai sair na edição de março do International Journal of Sports Nutrition and Exercise Metabolism

Methods of Body Mass Reduction by Combat Sports’ Athletes

Authors: Ciro José Brito1, 4, Aendria Fernanda Castro Martins Roas2, Igor Surian Souza Brito3, João Carlos Bouzas Marins3, Claudio Córdova4, and Emerson Franchini5 Affiliations: 1Federal University of Sergipe. 2Izabela Hendrix Methodist University. 3Federal University of Viçosa. 4Brasilia Catholic University.5University of São Paulo. Acceptance Date: November 27, 2011 Abstract: The aim of this study was to investigate the methods adopted to reduce body mass (BM) in competitive athletes from the grappling (judo, jiu-jitsu) and striker (karate and taekwondo) combat sports’ athletes in the State of Minas Gerais Brazil. An exploratory methodology was employed through descriptive research, using a standardized questionnaire with objective questions self-administered to 580 athletes (25.0±3.7 yrs, 74.5±9.7 kg and 16.4±5.1% of body fat). Regardless of the sport, 60% of the athletes reported using a method of rapid weight loss (RWL) through increased energy expenditure. Strikers tend to begin reducing BM during adolescence. Furthermore, 50% of the samples used saunas and plastic clothing, and only 26.1% received advice from a nutritionist. We conclude that a high percentage of athletes use RWL methods. In addition, a high percentage of athletes use unapproved or prohibited methods, such as diuretics, saunas and plastic clothing. The age at which combat sports’ athletes reduce BM for the first time is also worry, especially among strikers. Keywords: martial arts, weight loss, athletic performance, diuretics.

Efeitos do período competitivo sobre variáveis fisiológicas e mentais

J Sports Med Phys Fitness. 2012 Feb;52(1):1-10.

Effects of 7-weeks competitive training period on physiological and mental condition of top level judoists.

Garatachea N, Hernández-García R, Villaverde C, González-Gallego J, Torres-Luque G.

Source

Faculty of Health and Sport Science, Department of Physiotherapy and Nursing, University of Zaragoza, Huesca, Spain2 Extremeña Federation of Judo and DD.AA, Badajoz, Spain3 Faculty of Health Science, University of Granada Granada, Spain4 Institute of Biomedicine (IBIOMED), University of León, León, Spain5 Faculty of Education, University of Jaén, Jaén, Spain - nuria.garatachea@unizar.es.

Abstract

AIM:

We examined hormonal and haematological parameters and the profile of mood states (POMS) in top level judoists undertaking a 7-week competitive training period in a real contest.

METHODS:

Participants were 10 top level judoists belonging to the Spanish National Team. Training load was calculated by multiplying the training session intensity by the duration of the training session. The judoists competed in two official events on weeks 3 and 6 of the study.

RESULTS:

Urinary catecholamines increased at the end of the competitive period. Serum cortisol increased during the weeks in which judoists competed, confirming the existence of and anticipatory cortisol response to exercise; although we failed to find serum testosterone increases. Because of leukocyte values did not change, except monocytes, we speculate that the intensity of training was not sufficiently high to evoke injury to muscle tissue. Anger, tension, and fatigue increased according with training load, suggesting that the training exercise led participants into a negative psychological state.

CONCLUSION:

Findings indicate that during competitive periods, judoists suffer hormonal and mood changes according to training load and competitive events. Results support the usefulness of monitoring biological and psychological markers during season in order to adjust training loads and periods of recovery.