Sport 6. 11:00, Room 101A, Presentation 0704 S375

The Biomechanical Analysis of Whip-Kick in Shan-shou

C. H. Wu1, L. R. Chuang1, C.T. Hong2, Y. H Nien3

1Chinese Culture University, e-mail:jyhhong.wu@msa.hinet.net 2Yuanpei University, 3National College of Physical Education and Sports

INTRODUCTIONShan-shou is a traditional fighting skill in China. It became the official sports in 13th Asia Games in 1998. The skill of Shan-shou included three parts: punching, kick and wrestling. We can find the kicking skill was played an important technique in the competition of Shan- shou. It was according to the analysis of skill (Chiou, 1999). The whip-kick was the most popular kick skill in Shan-shou. Sometimes requiring power to penetrate the target (penetrating kicking), while other times just hitting the surface (surface kicking) (Chuang, 1998). What happens in the leg that differs in these two kicks? We want to compare the surface and penetrating whip kicking. We hope to study and discover the coordination & control mechanism of the lower limb, while whip kicking with penetrating and surface power.

METHODSThere were 12 volunteers from national Shan-shou team to be the subjects, who performed penetrates and surface kicking. Their age was 27.9±2.2 years, height was 172.1±6.8cm, body weight was 69.5±6.4 kg, and they have at least 10 years that participate in Shan-shou competition. A 3D Motion Analysis System was used to analyze the motion (10 cameras at 100Hz), liked the figure 1. We put the acceleration in the target and used the Acqknowledge Bio-pac system (1000Hz to get the acceleration of target when subjects kick the target. We used paired t-test to compare the dependent variables between penetrating and surface kicking. The probability level was set at P <.05.

RESULTS AND DISCUSSION The results showed on table 1. The ankle velocity of attacking leg between surface and penetrating kicking were significant, penetrating kicking was higher than surface kicking (p <.05).The target’s acceleration was different, penetrating higher than surface kick (p <.05). The result of action time was same (p<.05). The results were similar to Chuang, 1998. The attacking effect and fist’s velocity of penetrating striking were higher than surface striking.

Figure 1. The experimental setup

CONCLUSIONS The velocity of attacking leg in penetrating kicking was faster than surface kicking, and power of penetrating kicking was stronger than surface kick. It is a good tactic to use penetrating kicking when the opponent lost his balance, but not for using continue technique.

REFERENCES 1.Chiou, W. S. (1999). Shan-Shou techniques vercus

wining points. Unpublished master’s thesis, Chinese Culture University, Taiwan.

2. Hong, C.T. (2006). The biomechanical analysis of side-stamp in wushu. Journal of Physical Education in Higher Education, 8(1), 189-200.

3. Tang, H. W. (2001). A Comparative Analysis of the Kinetics and Kinematics of Five Different Roundhouse Kicks in Taekwondo. Unpublished master’s thesis, National College of Physical Education and Sports, Taiwan.

4.L. R. Chuang, Yu Liu, Norman Yang (1998). Intersegmental Dynamics Analysis of the Penetrating Strike and Surface Strike in the Chinese Martial Art. Abstracts of 1998 XVI International Society of Biomechanics in Sport, 20.

Table 1.The result of variables between penetrating and surface kicking when attacking leg contact the target variables

(m/s) (m/s) (m/s)(m/s)

(m/s) (m/s)

Accelerationof target (g)

Action time (sec.)

Surface kick 0.83±0.31 1.86±0.78 8.76±1.68 1.14±0.32 1.03±0.44 0.54±0.35 69.82±3.91 0.25±0.02Penetrating kick 0.98±0.25 1.55±0.61 10.60±1.52 1.31±0.27 1.48±0.25 1.27±0.43 85.89±9.10 0.22±0.01

XXI ISB Congress, Podium Sessions, Wednesday 4 July 2007 Journal of Biomechanics 40(S2)