terça-feira, 17 de dezembro de 2013
quarta-feira, 11 de dezembro de 2013
segunda-feira, 9 de dezembro de 2013
Respostas fisiológicas e percepção subjetiva de esforço durante competição internacional de karate (kumite)
Primeiro autor (Montassar Tabben) medalhista em Campeonato Mundial.
Asian Journal of Sports Medicine 2013. 4(4):263-271.
Physiological and Perceived Exertion Responses during International Karate Kumite Competition
Montassar Tabben, Rim Sioud, Monoem Haddad, Emerson Franchini, Anis Chaouachi, Karim Chamari, Claire Tourny-Chollet
Purpose: Investigate the physiological responses and rating of perceived exertion (RPE) in elite karate athletes and examine the relationship between a subjective method (Session-RPE) and two objective heart-rate (HR)-based methods to quantify training-load (TL) during international karate competition.
Methods: Eleven karatekas took part in this study, but only data from seven athletes who completed three matches in an international tournament were used (four men and three women). The duration of combat was 3 min for men and 2 min for women, with 33.6±7.6 min for the first interval period (match 1−2) and 14.5±3.1 min for the second interval period (match 2−3). HR was continuously recorded during each combat. Blood lactate [La-] and (RPE) were measured just before the first match and immediately after each match.
Results: Means total fights time, HR, %HRmax, [La-], and session-RPE were 4.7±1.6 min, 182±9 bpm, 91±3%, 9.02±2.12 mmol.L-1 and 4.2±1.2, respectively. No significant differences in %HRmax, [La-], and RPE were noticed across combats. Significant correlations were observed between RPE and both resting HR (r=0.60; P=0.004) and mean HR (r=0.64; P=0.02), session-RPE and Banister training-impulse (TRIMP) (r=0.84; P<0.001) and Edwards TL (r=0.77; P<0.01).
Conclusion: International karate competition elicited near-maximal cardiovascular responses and high [La-]. Training should therefore include exercise bouts that sufficiently stimulate the zone between 90 and 100% HRmax. Karate coaches could use the RPE-method to follow competitor’s competition loads and consider it in their technical and tactical training.
Key Words: Martial Arts; Heart Rate; Blood Lactate; Rating of Perceived Exertion
sábado, 7 de dezembro de 2013
O conteúdo das lutas nas séries iniciais do ensino fundamental: possibilidades para a prática pedagógica da Educação Física escolar
Nathalia Chaves Gomes, André Minuzzo de Barros, Fernando Paulo Rosa de Freitas, Suraya Cristina Darido, Luiz Gustavo Bonatto Rufino
As lutas são conteúdos da Educação Física que devem estar presentes na prática pedagógica. Contudo, há ainda lacunas e incompreensões em seu desenvolvimento pedagógico. Assim, por meio de uma revisão de literatura, este estudo objetivou analisar as lutas compreendendo sua importância, bem como apresentando uma forma de classificação. Em um segundo momento, apresentou-se uma proposta de organização curricular das lutas nas séries iniciais do ensino fundamental. Conclui-se ser importante compreender as lutas enquanto conteúdos das aulas de Educação Física propondo uma organização dos conteúdos que pode contribuir com a apropriação crítica dessa manifestação da cultura corporal de movimento.
terça-feira, 3 de dezembro de 2013
Neuroscience. 2013 Nov 28. pii: S0306-4522(13)00993-7. doi: 10.1016/j.neuroscience.2013.11.046. [Epub ahead of print]
Sports and brain morphology - a voxel based morphometry study with endurance athletes and martial artists.
Schlaffke L, Lissek S, Lenz M, Brüne M, Juckel G, Hinrichs T, Platen P, Tegenthoff M, Schmidt-Wilcke T.
Department of Neurology, BG-Kliniken Bergmannsheil, Ruhr Universität Bochum, Bochum, Germany. Electronic address: email@example.com.
Physical exercises and motor skill learning have been shown to induce changes in regional brain morphology, this has been demonstrated for various activities and tasks. Also individuals with special skills show differences in regional brain morphology. This has been indicated for professional musicians, London taxi drivers, as well as for athletes like dancers, golfers and judokas. However little is known about whether sports with different metabolic profiles (aerobic vs. anaerobic) are associated with different patterns of altered brain morphology. In this cross-sectional study we investigated two groups of high performance athletes, one group performing sports that are thought to be mainly aerobic, and one group performing sports known to have intermittent phases of anaerobic metabolism. Using high resolution structural imaging and voxel based morphometry (VBM), we investigated a group of 26 male athletes consisting of 13 martial artists and 13 endurance athletes as well as a group of non-exercising men (n = 13). VBM analyses revealed higher gray matter volumes in the supplementary motor area/dorsal premotor cortex (BA 6) in both athlete groups as compared to the control group. In addition, endurance athletes showed significantly higher gray matter volume in the medial temporal lobe, specifically in the hippocampus and parahippocampal gyrus, which was not seen in the martial arts group. Our data suggest that high performance sports are associated with changes in regional brain morphology in areas implicated in motor planning and motor learning. In addition high level endurance sports seem to affect medial temporal lobe structures, areas that have previously been shown to be modulated by aerobic exercise.