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4 Biomechanics Analysis to the Preliminary Squat and Elastic Force of the Barbell of the Clean and Jerk of Woman Weight Lifting in Taiwan Region June,2002 Graduate Student Yuan-Chien Ni Advisor Pao-Cheng Lin ABSTRACT This research use the biomechanical method and inquire into the Taiwan region four the Olympics of the potentials and excellent contestant of the world classes stand to raise the kinematics and kinetics characteristics of the preliminary squat of the clean and jerk. The contestants are Wang Chin-Yu, Kuo Pin-Chun, Kuo Yi-Han and Chen Hsiao-Lien. This research was not only capture the knee joint data such as angle and angular velocity by the high speed camera but also using force plate capture the ground reaction forces at the same time. The experiment shows the angular change of the knee joint during the preliminary squat down was distributed in 113 to 127 degrees and with the average value was 120 degrees. The maximum ground reaction force during the pre-squat down is 2.08 time to body weight in average, 1.5 time during the post-squat down and 4.28 time during the pull up. The elastic deformation of the barbell left side during pre-squat down is cm in average, the middle point is cm and the right side is cm. During the post-squat down, the elastic deformation of the barbell left side the even all cm, the middle point is average cm and the right barbell side is average cm. During the pull up, the deformation of the barbell left side is the average cm, the middle point is average cm and the right barbell side is average cm. Key words: woman weight Lifting,clean & jerk,jerk,preliminary, a barbell elasticity IV

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11 1987 Schodl

12 (Snatch) (Clean & Jerk) IWF-Medals and World Records in weightlifting 1997 Clean Jerk ( ) 2

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15 (High Speed Camera) Kistler 5

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17 (Jerk ) To prepare posture 7

18 1-6-2 Preliminary

19 1-6-4 ( Pre squat ) ( Post squat ) 9

20 1-6-6 Jerk pull

21 Inertia on the rise ( Stride forward squat keep up ) A barbell elasticity 11

22 (1978)

23 r= %

24 Baumann (1983) 35mm 1/3 Kauhanen (1984) concentric phase 1994 r=0,547(n=25,p<0.01)

25 (1994) / / 1.18 / 1.56 / / Bartonietz (1996) Reiser (1996) transition phase

26 % % 3.6% 41.7% 54.8% 1999 (2000 )

27 % Vorobyev (1978) 1979 A=h =Fcosθ S F θ F S Fcosθ A h Fcosθ S 1981 Garhammer ( ) 17

28 (1999) % 18

30 ( ) ( ) ( ) ( ) A B C D

31 Kistler (Force-plate) 4 (Amplifier) Kistler (Piezoelectric Transducer) (Sensitivity) Fz ( ) Fx Fy ( ) (Bioware) 21

32 Kistler (Aril Motion Analy system) ( ) / Sony 22

33 Kistler 12Bit A/D Bioware 23

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37 Kistler Kistler (Amplifier) BioWare BioWare 15 UESAKA-TOKYO

40 :Kistler :9281B :500Hz :Kodak :Fastcam :250FPS :1/

41 Clean (Jerk) Aril Motion Analysis System Kistler Aril Motion Analysis System

42 4-1-1 Ariel Motion Analysis System

43 ( ) kistler 12-Bit (A/D Transform) A B C D (1) (2) (3) (4) 33

44 ( 0 )

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47 4-2-1 A A / 40 / 69 / 55 / B B / 69 / 79 / 123 / C C / 79 / 124 / 132 / 37

48 4-2-4 D D / 66 / 132 / 128 / A A / 40 / 69 / 55 / B B

49 48 36 / 69 / 79 / 123 / C C / 79 / 124 / 132 / D D / 66 / 132 / 128 / 39

50 ( 4-2-5) : A B C D ( 4-2-6) : A B C

51 4-2-6 : ( ) D ( 4-2-7) / A B C D / 64 / 101 / 110 / 41

52 ( ) Ariel Motion Analysis System

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54 A A B B

55 C C D D A A B B C C

56 D D A B C D : A B C D

57 A B C D kistler (ASCII CODE) Excel

58 A A 48

60 B B

61 C C 51

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66 N-W=ma W-N=ma m 56

67 x dt dx && 2 2 x dt dx & s δ V h k k=- S mg δ m g 0 OX w = + x dt X d ω t=0 ( ) s s s g x mg Kx x k mg mx δ ω δ δ = = = + = 2 &&

68 x = 0 dx x 0 = & dt v x = sinωt w x = vwcosωt x 2 = vwsin wt = w x v 2 X max = X max w v A A= w A V w F=-KX 4 & x& a X A a OX G = ma N 2 N= mg + ma + a = ω A

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83 : A. Vorobyev. (1978). Weightlifting. International Weight-lifting Federation, Budapest. G. Schodl. ( 1997). Medals and World Records in Weightlifting. IWF. H. Kauhanen, K. Hakkinen, and P. Komi. (1984). A biomechanical analysis of the snatch and clean & jerk techniques of finnish elite and district level weightlifters. Scandinavian Journal of Sport Sciences 6: J. Garhammer. (1989). Bar Trajectories of World Champion Male and Female Weight lifters: Coaching Applictories.Part IIOL: 7. J. Garhammer. (1985). Biomechanical Profiles of Olympic Weightlifting; International Journal of Sport Biomechanics K. Bartonietz. (1996). Biomechanics of the snatch: toward a higher training efficiency. Strength and Conditioning 18:24-31, M. Bobbert, K. Gerritsen, M. Litjens, and A. van Soest. ( 1996). Why is countermovment jump height greater than squat jump height? Medicine and Science in Sport and Exercise 28: R. Enoka. (1979). The pull in Olympic weightlifting. Medicine Science and Sport 11: R. Newton, A. Murphy, B. Humphries, G. Wilson, W. Kraemer, and K. Hakkinen. (1997). Influence of load and stretch shortening cycle on the kinematics, kinetics and muscle activation that occurs during explosive upper-body movements. European Journal of Applied Physiology 75: R. Reiser, S. Smith, and R. Rattan. (1996). Science and technology to 73

84 enhance weightlifting performance: The Olympic program. Strength and Conditioning 18:43-51, T. Ajan, and L. Baroga. ( 1988). Weightliftin Fitness for all sports. IWF. W. Baumann, V. Gross, K. Quade, P. Galbierz, and A. Schwirtz. (1988). The Snatch Technique of World Class weightlifters at the 1985 World Championships. International Journal of Sport Biomechanics, 4:

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Microsoft Word - MP2018_Report_Chi _12Apr2012_.doc

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