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2 Acta of Bioengineering and Biomechanics

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Estimation of muscle torque in various combat sports

100%

Pędzich W. , Mastalerz A. , Sadowski J.

tom Vol. 14, no. 4

107-112

The purpose of the research was to compare muscle torque of elite combat groups. Twelve taekwondo WTF athletes, twelve taekwondo ITF athletes and nine boxers participated in the study. Measurements of muscle torques were done under static conditions on a special stand which belonged to the Department of Biomechanics. The sum of muscle torque of lower right and left extremities of relative values was significantly higher for taekwondo WTF athletes than for boxers (16%% p < 0.001 for right and 10%, p < 0.05 for left extremities) and taekwondo ITF (10%, p < 0.05 for right and 8% for left extremities). Taekwondo ITF athletes attained significantly higher absolute muscle torque values than boxers for elbow flexors (20%, p < 0.05 for right and 11% for left extremities) and extensors (14% for right and 18%, p < 0.05 for left extremities) and shoulder flexors (10% for right and 12%, p < 0.05 for left extremities) and extensors (11% for right and 1% for left extremities). Taekwondo WTF and taekwondo ITF athletes obtained significantly different relative values of muscle torque of the hip flexors (16%, p < 0.05) and extensors (11%, p < 0.05) of the right extremities.

The comparison of the dynamics of selected leg strokes in taekwondo WTF

99%

Pędzich W. , Mastelerz A. , Urbanik C.

2006

tom Vol. 8, nr 1

83-90

The aim of the study was to compare a dynamics of selected leg strokes in taekwondo WTF (Word Taekwondo Federation). Investigations were carried out in the group of 5 competitors with mastery class of taekwondo WTF. Indicators which described two maximal trials of each limb of the body for the side-kick (yop-chagi) and spinning back kick (dwit-chagi) were analyzed. The athletes executed strokes against vertically mounted force plate equipped with an appropriate absorption layer which minimized the risk of injuries. The signal of force was sampled with the frequency of 800 Hz. Signals were filtered by Bessel’s filter at a limit frequency of 75 Hz. The following indicators were analyzed: maximal and average values of stroke force, impulse of stroke, time of gaining maximal force, average velocity of increasing stroke force. The results show that taekwondo athletes recorded similar values of the strokes investigated. The differences in maximal stroke force were 6% and in average stroke force – 3% and they were also related to athlete’s weight. The results confirm athlete’s ability to use the total body mass to increase the stroke force. No significant relations were found between time of gaining maximal force and the value of stroke force. This proves that the technique of stroke, different size and kind of striking surfaces influence the value of stroke force.