Artigo sobre recuperação entre as lutas de judô

Artigo do nosso grupo no European Journal of Applied Physiology de novembro

Effects of recovery type after a judo match on blood lactate and performance in specific and non-specific judo tasks
Emerson Franchini ; Rômulo Cássio de Moraes Bertuzzi; Monica Yuri Takito; Maria A. P. D. M. Kiss
Eur J Appl Physiol (2009) 107:377–383
DOI 10.1007/s00421-009-1134-2

Abstract The objective of the present study was to verify if active recovery (AR) applied after a judo match resulted in a better performance when compared to passive recovery (PR) in three tasks varying in specificity to the judo and in measurement of work performed: four upper-body Wingate tests (WT); special judo fitness test (SJFT); another match. For this purpose, three studies were conducted. Sixteen highly trained judo athletes took part in study 1, 9 in study 2, and 12 in study 3. During AR judokas ran (15 min) at the velocity corresponding to 70% of 4 mmol l-1 blood lactate intensity (~50%VO2 peak), while during PR they stayed seated at the competition area. The results indicated that the minimal recovery time reported in judo competitions (15 min) is long enough for sufficient recovery of WT performance and in a specific high-intensity test (SJFT). However, the odds ratio of winning a match increased ten times when a judoka performed AR and his opponent performed PR, but the cause of this phenomenon cannot be explained by changes in number of actions performed or by changes in match’s time structure.
http://www.springerlink.com/content/p2379223vht79x69/fulltext.pdf?page=1

Mariana Barros, atleta que realiza preparação física na EEFE, conquista o campeonato brasileiro sênior 2009 na categoria meio-médio

Meio-Médio Feminino
1. Marina Barros (SP)
2. Laisa Santana (RJ)
3. Viviane Trindade (RS) e Danieli Luci (BA)
5. Patrícia Oliveira (DF) e Fabíola da Silva (SC)

Perfil de aptidão física de lutadores estilo livre do Irã

Physiological Profile of Elite Iranian Junior Freestyle Wrestlers.
Mirzaei B, Curby DG, Rahmani-Nia F, Moghadasi M.
1Department of Sport Sciences, University of Guilan, Rasht, Iran; and 2School of Health and Physical Education, Aurora University, Aurora, Illinois.
J Strength Cond Res 23(x): 000-000, 2009

The purpose of the present investigation was to describe the physiological profile of elite Iranian junior freestyle wrestlers. Seventy elite wrestlers (age 19.8 +/- 0.9 years) who were invited to the national training camps, based on their top 10 national ranking, participated in this study. The physiological profile included body weight, flexibility (sit and reach test), maximal oxygen consumption (Bruce protocol), maximal anaerobic power of the legs (Wingate test), muscular endurance and strength (bench press, squat, pull-ups, push-ups, grip strength, and bent-knee sit-up test), speed (40-m sprint), agility (4 x 9-m shuttle run), and body composition (7-site skinfold). The major results (mean +/- SD) are as follows: body weight (kg): 77.5 +/- 19.8; flexibility (cm): 38.2 +/- 3.94; maximal oxygen consumption (ml.kg.min): 50.5 +/- 4.7; maximal anaerobic power of the legs (W): 455.5 +/- 87.6; 1-repetition maximum bench press (weight lifted kg body weight): 1.4 +/- 0.15; 1-repetition maximum squat (weight lifted kg body weight): 1.7 +/- 0.2; push-ups (n): 66.9 +/- 7.6; pull-ups (n): 31.6 +/- 9.7; grip strength (force in kg.body weight kg) 1.02 +/- 0.11; bent-knee sit-ups (n): 66.5 +/- 8; speed (s): 5.07 +/- 0.17; agility (s): 8.7 +/- 0.25; and body fat (%): 10.6 +/- 3.8. The present study provides baseline physiological data that have been used in the prescription of individual training programs for these athletes. This information is also available to the coaches and can contribute to the general strategy employed by a wrestler and for a specific match.

Desidratou? Tome água

Effects of Commercially Formulated Water on the Hydration Status of Dehydrated Collegiate Wrestlers.
Valiente JS, Utter AC, Quindry JC, Nieman DC.
Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, North Carolina.
J Strength Cond Res. 2009 Oct 12. [Epub ahead of print]

The objective of this study was to evaluate the effects of three different drinks (commercially formulated water, bottled water, and a carbohydrate-electrolyte beverage) on blood and urinary markers of hydration after acute dehydration in collegiate wrestlers. Twenty-one athletes were recruited to perform a randomized, crossover study comparing the effectiveness of commercially formulated water, carbohydrate-electrolyte (6% or 60 g.L), or regular bottled water (placebo) in promoting rehydration after a 3% reduction in body mass. Urine specific gravity (Usg), urine osmolarity (Uosm), plasma osmolarity (Posm), and plasma volume were measured pre- and post-dehydration and at 1 hour after rehydration. Statistical analyses used a 3 (conditions) x 3 (times) repeated measures analysis of variance. Significant (p < 0.01) interactions were found for Posm, Uosm, and Usg. Posm returned to baseline levels and Uosm remained in a lower balance after 1 hour of rehydration in the trials of the commercially formulated water and regular bottled water. No significant interactions were found for plasma volume shift. The findings of this study demonstrate that the commercially formulated water was no more effective in promoting rehydration than either a carbohydrate-electrolyte solution or plain water in collegiate wrestlers after a 3% reduction in body mass and a rehydration period of 1 hour when consuming 100% of their body weight loss.

Força, tempo de reação e precisão em diferentes golpes do kung fu

Resultados interessantes no resumo.

Force, reaction time, and precision of Kung Fu strikes.
Neto OP, Bolander R, Pacheco MT, Bir C.
Department of Health & Kinesiology, Texas A&M University, USA. osmarpintoneto@hotmail.com
Percept Mot Skills. 2009 Aug;109(1):295-303

The goal was to compare values of force, precision, and reaction time of several martial arts punches and palm strikes performed by advanced and intermediate Kung Fu practitioners, both men and women. 13 Kung Fu practitioners, 10 men and three women, participated. Only the men, three advanced and seven intermediate, were considered for comparisons between levels. Reaction time values were obtained using two high speed cameras that recorded each strike at 2500 Hz. Force of impact was measured by a load cell. For comparisons of groups, force data were normalized by participant's body mass and height. Precision of the strikes was determined by a high speed pressure sensor. The results show that palm strikes were stronger than punches. Women in the study presented, on average, lower values of reaction time and force but higher values of precision than men. Advanced participants presented higher forces than intermediate participants. Significant negative correlations between the values of force and precision and the values of force and reaction time were also found.

Uso de artes marciais como meio de intervenção para saúde mental de crianças

Artigo recente evidencia benefícios da prática de artes marciais na saúde mental de crianças, mas também mostra grande percentual de evasão dos praticantes (vide p. 15 do artigo; link abaixo). O artigo também cita artigos lidando com a relação arte marcial-violência-agressividade que parecem ser interessantes.

Martial arts as a mental health intervention for children? Evidence from the ECLS-K.
Strayhorn JM, Strayhorn JC.
Child Adolesc Psychiatry Ment Health. 2009 Oct 14;3(1):32. [Epub ahead of print]

ABSTRACT: BACKGROUND: Martial arts studios for children market their services as providing mental health outcomes such as self-esteem, self-confidence, concentration, and self-discipline. It appears that many parents enroll their children in martial arts in hopes of obtaining such outcomes. The current study used the data from the Early Childhood Longitudinal Study, Kindergarten class of 1998-1999, to assess the effects of martial arts upon such outcomes as rated by classroom teachers. METHODS: The Early Childhood Longitudinal Study used a multistage probability sampling design to gather a sample representative of U.S. children attending kindergarten beginning 1998. We made use of data collected in the kindergarten, 3rd grade, and 5th grade years. Classroom behavior was measured by a rating scale completed by teachers; participation in martial arts was assessed as part of a parent interview. The four possible combinations of participation and nonparticipation in martial arts at time 1 and time 2 for each analysis were coded into three dichotomous variables; the set of three variables constituted the measure of participation studied through regression. Multiple regression was used to estimate the association between martial arts participation and change in classroom behavior from one measurement occasion to the next. The change from kindergarten to third grade was studied as a function of martial arts participation, and the analysis was replicated studying behavior change from third grade to fifth grade. Cohen's f;2 effect sizes were derived from these regressions. RESULTS: The martial arts variable failed to show a statistically significant effect on behavior, in either of the regression analyses; in fact, the f;2 effect size for martial arts was 0.000 for both analyses. The 95% confidence intervals for regression coefficients for martial arts variables have upper and lower bounds that are all close to zero. The analyses not only fail to reject the null hypothesis, but also render unlikely a population effect size that differs greatly from zero. CONCLUSIONS: The data from the ECLS-K fail to support enrolling children in martial arts to improve mental health outcomes as measured by classroom teachers.
Link para o artigo completo
http://www.capmh.com/content/pdf/1753-2000-3-32.pdf