Characteristic Comparison of Ground Reaction Force of the Taekwondo's Apkubi Motion and the Walking on Older Persons

Abstract

The purpose of this study was to quantify the biomechanical characteristics of the ground reaction force(GRF) during the Taekwondo's Apkubi, one of the basic movement in Taekwondo and the walking. The GRF profiles under the stance foot of Apkubi movement and walking were directly measured in sample of 20 healthy older persons. In the anterior-posterior and vertical direction, the GRF of the Apkubi movement reached to the peak braking force at 10% of the normalized stance time percent and the peak driving force at 90% of stance time, but that of the walking reached to the peak braking force at 20% of stance time and the peak driving force at 80% of stance time. In vertical force, the GRF of the walking showed two peak values, but that of the Apkubi movement seemed three peak values. Moreover the first peak vertical force was significantly(t=6.085, p<.001) greater in the walking(about 1.8 times of body weight) than the Apkubi(about 1.4 times of body weight). The walking velocity was affected significantly(over p<.05) by the braking impulse, the peak braking force and the first peak vertical force. Futhermore the peak braking force in the Apkubi showed a significant effect on the Apkubi's stride length(p<.01). So, we concluded that the braking force after the right touch down, the stance foot on the ground contributed to move the leg forward.

A Study of Motor Expertise about Kinematic and Kinetic Characteristics of Lower Extremity in the Seokmun Ilwol Martial Art Yin-yang Bo Gait Pattern

“…한편 태극권의 보행 패턴을 낙상 방지 및 보행 조절적 관점에서 분석하여, 태극보(Tai-chi gait)의 지면 반력 특성 과 무릎 전단력 등을 연구한 결과가 보고되기도 하였다 (Wolf et al, 2003;Wu & Hitt, 2005;Wu & Millon, 2008). 우리나라에서의 보행 패턴분석으로, Go 등은 보행 시 의도적인 발 디딤 각도 변화의 연구에서 의도적인 팔 자걸음이 무릎 내전 모멘트를 감소시킨다는 결과를 (Go, Hong, Lee, & An, 2013), Bae와 Kim은 태권도 앞굽이 서기 운동 연구에서 지지 다리의 하지 굴곡 증가로 충격 완화, 하지 근력 강화, 전방회전성 용이성 등을 제시하였 다 (Bae & Kim, 2011). Hong(2010)은 무용의 발 디딤 유형에 따른 하지 관절의 운동역학적 특성 연구에서 무릎 관절 부하의 차이를 비교분석하였다.…”

Reaction forces and bone maturation in taekwondo: comparison with and without tatami

“…the Apkubi taekwondo technique analysis showed 1.4 body weight (BW) vertical reactions forces, a smaller value than the one reported for walk activity, 1.8 BW (t = 6.085; p < 0.001). this peak is registered when receiving or contacting the foot with the ground, which constitutes an important phase of deceleration for the structures in sports movements and is identified with a considerable mechanical overload applied to the locomotor system [4]. In the evaluation of 10 experienced capoeiristas, the values found were 1.36 ± 0.17 BW for the movement called the hammer and 1.91 ± 0.36 BW for the closed negative movement; values of 5.15 ± 2.06 BW for the screw movement and 4.67 ± 1.65 BW for the skipped armed movement were also registered [5].…”