Estrutura temporal, RPE e respostas fisiológicas durante lutas de karate: comparação entre vencedores e vencidos

Int J Sports Physiol Perform. 2013 Jul 22. [Epub ahead of print]

Time-Motion Analysis, Physiological and Rate of Perceived Exertion Responses to Karate Official Combats: Is There a Difference Between Winners and Defeated Karatekas?

Chaabène H, Franchini E, Miarka B, Selmi MA, Mkaouer B, Chamari K.

Source

Research Unit, Analysis and Evaluation of factors affecting the sport performance, Higher Institute of Sports and Physical Education, Ksar said, Tunisia.

Abstract

Purpose: The aim of this study was to measure and to compare physiological and time-motion variables during karate fighting's and to assess eventual differences between winners and defeated elite karatekas in an ecologically valid environment. Methods: Fourteen elite male karatekas who regularly participated in national and international events took part in a national-level competition. Results: There were no significant differences between winners and defeated karatekas regarding all the studied variables. Karatekas used more upper-limbs (76.19%) than lower-limbs' techniques (23.80%). The kisami-zuki represented the most frequent technique with 29.1% of all used techniques. The duration of each fighting activity ranged from <1 to 5 s, with 83.8±12.0% of the actions lasting less than 2-s. Karatekas executed 17±7 high-intensity actions per-fight, which corresponded to ~6 high-intensity actions per minute. Action-to-rest ratio was about 1:1.5 and high-intensity action-to-rest ratio was ~1:10. The mean blood lactate responses at 3-min post-combat (Lapost) elicited during karate fighting was 11.18±2.21 mmol.L-1 (difference between Lapre and Lapost = 10.01±1.81 mmol.L-1). Mean heart rate was 177±14 bpm (91±5 % of HRpeak). Karatekas spent 65% of the time exercising at HR>90% of the individual HRpeak. Conclusion: karatekas predominantly use upper-limbs' karate techniques. Karate's nature is intermittent with fighting activities representing ~6% of total combat's duration, with ~84% of actions lasting less than 2-s, and with approximately ~21-s mean time interval in-between. Kumite combats induced high blood lactate concentration and near maximal cardiovascular strain. Other key-success factors should be investigated to properly discriminate winners and defeated athletes.

http://www.ncbi.nlm.nih.gov/pubmed/23881174