Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2007) 06, 23 - 27

Combat Sports Special Issue 2, Research article
Electromyographic Study of a Sequence of Yau-Man Kung Fu Palm Strikes with and without Impact
Osmar Pinto Neto , Marcio Magini, Marcos T.T. Pacheco
Author Information
Institute of Research and Development, University of Vale do Paraíba, São José dos Campos, SP, Brazil

Osmar Pinto Neto
✉ Univap - IP&D, Av. Shishima Hifumi, 2911, São José dos Campos, São Paulo, Brazil, 12.244-000
Email: osmar@univap.br
Publish Date
Received: 15-02-2007
Accepted: 07-08-2007
Published (online): 01-10-2007
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ABSTRACT

In martial arts and contact sports, strikes are often trained in two different ways: with and without impacts. This study aims to compare the electromyographical activity (EMG) of the triceps brachii (TB), biceps brachii (BB) and brachioradialis (BR) muscles during strikes with and without impacts. Eight Yau-Man Kung Fu practitioners participated in the experiment. Each participant performed 5 sequences of 5 consecutive KF Yau-Man palm strikes with no impact intercalated with 5 sequences of 5 repetitions targeting a KF training shield. Surface EMG signals were obtained from the TB, BB, and RB for 3.0 seconds using an eight-channel module with a total amplifier gain of 2000 and sampled at 3500 Hz. The EMG analyses were done in the time (rms) and frequency (wavelet) domains. For the frequency domain, Morlet wavelet power spectra were obtained and an original method was used to quantify statistically significant regions on the power spectra. The results both in the time and frequency domains indicate a higher TB and BR muscle activity for the strikes with impacts. No significant difference was found for the BB in the two different scenarios. In addition, the results show that the wavelet power spectra pattern for the three analysed muscles obtained from the strikes with and without impacts were similar.

Key words: Electromyography, wavelet transform, impact, martial arts, biomechanics


           Key Points
  • EMG analysis of a sequence of Kung Fu strikes demonstrates higher Triceps Brachii and Brachioradialis muscle activity for strikes with impact than strikes without impact.
  • An original reliable method for quantifying EMG wavelet transform results is presented.
  • EMG wavelet power spectra describe muscle roles during a Kung Fu sequence of strikes.
 
 
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