Trabalhos sobre Boxe

Int J Sports Physiol Perform. 2012 Jul 31. [Epub ahead of print]

Amateur Boxing: Activity Profile of Winners and Losers.

Davis P, Wittekind A, Beneke R.

Source

Centre for Sport and Exercise Science, Biological Sciences, University of Essex, United Kingdom.

Abstract

An activity profile of competitive 3x2min novice level amateur boxing was created based on video footage and post-bout blood [lactate] in thirty-two male boxers (mean±SD) age: 19.3±1.4years, body mass: 62.6±4.1kg. Winners landed 18±11 more punches than losers by applying more lead hand punches in round 1 (34.2±10.9 vs. 26.5±9.4), total punches to the head (121.3±10.2 vs. 96.0±9.8) and block and counter punch combinations (2.8±1.1 vs. 0.1±0.2) over all 3 rounds, and punching combinations (44.3±6.4 vs. 28.8±6.7) in rounds 1 and 3 (all p<0.05). In 16 boxers peak post-bout blood [lactate] was 11.8±1.6mmol·l-1 irrespective of winning or losing. The results suggest that landing punches requires the ability to maintain a high frequency of attacking movements in particular the straight punch lead hand to the head together with punching combinations. Defensive movements must initiate a counter-attack. Post-bout blood [lactate] suggests that boxers must be able to tolerate a lactate production rate of 1.8mmol·l-1.min-1 and maintain skilful techniques at a sufficient activity rate.

PMID:

 

22869640

 

[PubMed - as supplied by publisher]

Int J Sport Nutr Exerc Metab. 2012 Jul 4. [Epub ahead of print]

β-alanine Improves Punch Force and Frequency in Amateur Boxers During a Simulated Contest.

Donovan T, Ballam T, Morton JP, Close GL.

Source

Sport and Exercise Sciences, Glyndwr University, Plas Coch Campus, Wrexham, UK.

Abstract

The aim of this study was to test the hypothesis that β-alanine supplementation improves punch power and frequency in amateur boxers during a simulated contest. Sixteen amateur boxers (each approximately 6 years experience) were assigned to β-alanine (n=8; 1.5 g x 4 times/d for 4 wks) or placebo supplementation (n=8), after initially being assessed for baseline punch performance. Before and after the supplementation period, all boxers completed a simulated contest consisting of 3 x 3 minute rounds (interspersed with 60 s rest) on a punch bag (with a force transducer attached). Each round involved 2 minutes 50 seconds performing standardised punching (standardised jab, cross combination) based on notation analysis, whereas the last 10 seconds involved maximal output punching (standardised jab, cross combination) during which time, punch force and frequency were recorded. Post-contest blood lactate was significantly increased in the β-alanine group (Pre-supplementation: 9.5 ± 0.9 mmol.L-1, Post-supplementation: 12.6 ± 0.5 mmol.L-1, P<0.05) whereas the placebo group showed no change (Pre-supplementation: 8 ± 2.8 mmol.L-1, Post-supplementation: 7.0 ± 2.7 mmol.L-1, P>0.05). During the 10 seconds maximal output punching, changes in mean punch force (β-alanine: 20 ± 1.01 kg: placebo 1 ± 1 kg) and punch frequency (β-alanine: 5 ± 4: placebo -2 ± 3) was greater (P<0.05) in the β-alanine supplemented group. We conclude that β-alanine supplementation improves punching performance in amateur boxers and suggest that this supplementation protocol may also prove ergogenic for other related combat sports.

PMID:

 

22805175

 

[PubMed - as supplied by publisher]