quarta-feira, 26 de março de 2014

Crioterapia no BJJ

Influencia de la crioterapia en la expresión de marcadores de daño muscular en luchadores de jiu-jitsu después de simulación de competición: estudio cruzado
Influence of cryotherapy on muscle damage markers in jiu-jitsu fighters after competition: a cross-over study
E. A. Pinho Júnior, Ciro Brito, W. O. Costa Santos, Charles Nardelli Valido, E. Lacerda Mendes, E. Franchini
Rev Andal Med Deporte. 2014;07:7-12
Objetive. The acute effects of cryotherapy on creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) expression, perceived pain and upper limb muscle strength in jiu-jitsu competitors were investigated.
Method. Ten highly trained athletes underwent two simulated competition sessions composed by four 7-minute combats with a 15-minute interval between them. Athletes were randomly allocated to receive either cold water immersion (5 ± 1 °C for 19 minutes) or no intervention (control) after competition simulation in a crossover counterbalanced fashion.
Results. For LDH, there was an effect of condition (F1,18= 7.91, P = 0.012; η2 = 0.31), with lower values being found in cryotherapy as compared to control (criotherapy = 533.2 ± 55.4 and 671.2 ± 61.0 for pre- competition and post-recuperation, respectively; control = 528.5 ± 63.7 e 759.8 ± 85.7 UI/l for pre- competition and post-recuperation, respectively). Delta CPK differed significantly between conditions (criotherapy = 138.0 ± 95.1 UI/l; control = 231.3 ± 135.8 UI/l t = -1,72; P = 0,119; effect size = 0.75). For perceived pain there was also an effect of condition (F1,18 = 12.35, P = 0.003; η2 = 0.41), with lower values being found following cryotherapy (2.4 ± 1.4 versus 4.4 ± 1.8, P = 0.003). Pre-competition skin temperature was lower than that measured after recovery (34.5 ± 1.9 oC. versus 37.6 ± 1.3 oC, P = 0.0005). There were significant correlations between perceived pain and CPK (r = 0.314) and LDH (r = 0.546). The concentrations of CPK and LDH were negatively correlated with dynamic strength (r = - 0.525).
Conclusion. Recovery via cold water immersion after simulated competition resulted in less muscle damage and hypoalgesia compared to the control.


terça-feira, 25 de março de 2014

Protocolos de progressão do treino de força para atletas de judô

Influence of linear and undulating strength periodization on physical fitness, physiological and performance responses to simulated judo matches

Franchini, Emerson; Branco, Braulio M.; Agostinho, Marcus F.; Calmet, Michel; Candau, Robin

Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0000000000000460
Published Ahead-of-Print
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To determine the most effective strength periodization model is important to improve judo athletes' performance. Thus, the aim of this study was to compare the effects of linear and daily undulating periodized resistance training on anthropometrical, strength and judo-specific performance. For this, 13 adult male judo athletes (LP = 6 and DUP = 7) completed a 8-week training program concomitantly to a typical judo training program. Athletes were submitted to a physical fitness test battery, before and after 8 weeks of training, consisting of: (a) maximal strength evaluation - bench press, squat and row exercises one-repetition maximum (1RM) tests, and handgrip maximal isometric strength; (b) power evaluation - standing long jump test; (c) strength endurance evaluation - dynamic and isometric chin up tests gripping the judogi; (d) anthropometry measurements - body mass, height, skinfold thickness and circumferences; (e) judo-specific fitness - performance during the Special Judo Fitness Test; (f) match simulation - three 5-min judo match simulations separated by 15-min passive recovery. Eight weeks of linear and undulating strength-training protocols induced similar significant (P < 0.05) decreases in skinfold thicknesses (-6.5%) and increases in flexed arm (2.0%) and forearm (1.8%) circumferences, maximal isometric handgrip strength (4.6% and 6.1% for right and left hands, respectively), isometric strength-endurance chin-up performance gripping the judogi (18.9%), maximal dynamic strength for row (11.5%), bench-press (11.6%) and squat exercises (7.1%), total weight lifted at 70% 1RM for bench-press (15.1%) and squat (9.6%) exercises, number of throws during sets B (3.1%) and C (9.5%) of the SJFT (resulting in increased total number of throws - 5.5%) and decreased index in this test, -4.2%). However, no changes were observed in the physiological, rating of perceived exertion or technical actions during three match simulations. Thus, it seems that the short-term adaptations were not transferable to the match condition.

terça-feira, 18 de março de 2014

Efeito do lado de pegada e do lado de entrada da técnica de projeção sobre a efetividade do ataque e sobre o resultado do combate em atletas de judô de elite

Effects of kumi-kata grip laterality and throwing side on attack effectiveness and combat result in elite judo athletes
Authors: Javier Courel Ibáñez; Emerson Franchini; Pedro Femia;Nemanja StankovicRaquel Escobar
International Journal of Performance Analysis in Sport, Volume 14, Number 1, April 2014 , pp. 138-147(10)
The aim of this study was to identify the effects of kumi-kata grip laterality and throwing side combinations (i.e., attacking on the same side of the gripping, or vice versa) on attack effectiveness and combat result in elite male and female judo athletes. Through systematic observation, 242 combats from 12 World Ranking tournaments were analysed. Results from logistic regression showed that attacking on the same side of the kumi-kata increase the chance of scoring (χ2 (4) = 10.688, P = 0.030; OR = 1.65, P = 0.009) and winning the combat (χ2 (4) = 11.181, P = 0.025; OR = 1.35, P = 0.018), independently of sex and weight category. Perform same-side attacks by kenka-yotsu (adversaries using reverse grip, right versus left) was the most effective (χ2 (4) = 11.321, P = 0.023; OR = 1.84, P = 0.023), especially for lightest weight judo fighters. Perform same-side attacks by ai-yotsu (both opponents using right or left grip at the same time; χ2 (4) = 9.630, P = 0.047; OR = 2.02; P = 0.009) and only one athlete gripping (only the athlete attacking performing the grip; χ2 (4) = 9.512, P = 0.050; OR = 3.08; P = 0.035) increased the likelihood of winning the combat. This information should be considered for coaches to plan combat strategies and design training situations close to the real competition.

sexta-feira, 14 de março de 2014

Novo teste para avaliação de karatekas / New test for karatekas evaluation

Int J Sports Physiol Perform. 2014 Mar 11. [Epub ahead of print]
Validity and Reliability of New Field Aerobic Karate Specific Test (KST) for Karatekas.
Tabben M Montassar Tabben)1, Coquart J, Chaabène H Helmi Chaabane), Franchini E, Chamari K, Tourny C.
Author information
This study determined the validity and the reliability of a new specific field test that was based on the scientific data that exist within the latest literature research.
Seventeen international level karatekas participated in this study: 14 men (age: 24.1±4.6 years, body mass: 65.7±10.8 kg) and 3 women (age: 19±3.6 years, body mass: 54.1±0.9 kg). All performed the new karate specific test (KST) two times (test and retest sessions were carried out on separated occasions one week apart). Thirteen men performed also a laboratory test for assessing maximal oxygen uptake (VO2max).
Test-retest results showed the KST to be reliable. VO2peak, Peak heart rate (HRpeak), blood lactate ([La-]), rating of perceived exertion (RPE), and time to exhaustion (TE) did not display a difference between the test and the retest. The SEM and ICC for relative and absolute VO2peak, and TE were <5% and >0.90, respectively. Significant correlations were found between VO2peak (mL.kg-1.min-1) and TE measured from the KST (r=0.71, 95%CI: 0.35-0.88,p<0.0001). There was also no significant difference between VO2peak measured from the KST and VO2max recorded from the cyclo-ergometer laboratory test (55.1±4.8 vs 53.2±6.6 mL.kg-1.min-1, respectively) (t=-1.85, df=12, p=0.08, dz=0.51 [small]). The Bland and Altman analyses reported a mean difference (bias) ± the 95% limits of agreement of 1.9±7.35 mL.kg-1.min-1.
This study showed that the new KST test, with effort pattern replicating real karate combats, can be considered as a valid and reliable karate specific field test for assessing the endurance fitness of karatekas.