Browsing by Author "黃長福"

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    2003年全國運動會鉛球旋轉式投擲技術運動生物力學分析
    (中華民國運動教練學會, 2004-08-01) 彭賢德; 彭賢勝; 黃長福
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    2006~2008年瓊斯盃籃球賽中華男子隊攻守技術分析
    (2010) 賴俊明
    本研究的目的為了解2006~2008年瓊斯盃籃球賽中華男子隊在三屆比賽中攻守技術表現與其他各國代表隊的差異情形。研究樣本採用中華國籃球協會所提供的攻守統計資料，勝負與得分為效標變項，17個攻守技術統計資料為預測變項，以描述性統計、獨立樣本t考驗、皮爾遜積差相關與多元逐步廻歸分析進行統計分析。結果發現：勝場與敗場的表現中，三分球投中數、二分球命中率、籃板總數、阻攻的差異達顯著性；與三屆冠軍隊的比較後，中華男子隊在與強隊對戰時，除了減少失分，並且維持得分數在83分以上，將會有更高的勝率；利用多元逐步廻歸分析發現中華男子隊的表現以阻攻最具預測力，其次為二分球命中率；而增加三分球的使用質量是世界趨勢。
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    A 3D analysis of the volleyball spike
    (2005-08-27) 黃長福; Lin-Huan Hu; Yung-Hsiang Chen; Chenfu Huang
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    Age-differences in the free vertical moments during stepping down - pilot
    (2012-07-06) 黃長福; Tzu-Hsiang Yang; Chen-Fu Huang
    The aim of this study was to understand age-differences in body control during stepping down by investigating free vertical moments (FVMs). Two older adults and two young adults participated in this study. During each trial, lower extremities kinematics were measured using a 10 camera Vicon system (250Hz) and ground reaction forces were recorded using two Kistler force platforms (1000Hz). FVM was calculated by ground reaction forces using Visual3D software. The results indicated young adults showed adduction-FVM (ADD-FVM) but older adults presented abduction-FVM (ABD-FVM) during double-stance phase. Older adults seemed to exert more ABD-FVM than young adults while in the single support phase. It was concluded that the FVMs seemed to point to different strategies between older adults and young adults.
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    Angular analysis of the index and middle fingers during fastball and curveball pitching - a case study
    (2008-07-18) 黃長福; Chung-Lung Lin; Chen-fu Huang; Jia-Hao Chang
    The purpose of this study was to expand the knowledge by quantifying and comparing finger angle between curveball (CB) and fastball (FB) pitching. One division II college pitcher was participated in present study. A VICON Motion capture system were used to collect 3-D kinematic data (500Hz). Three successful trials for each FB and CB were collected. The metacarpal phalangeal joint (MCP), proximal interphalangeal joint (PIP) and distal interphalangeal joint (DIP) angle was analysed. There were several differences in MCP, PIP and DIP angle for CB and FB. But similar patterns were found between index finger and middle finger. This information may beneficial to conduct thefurther study to explore the mechanics of pitching.
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    The application of range of motion (ROM) and coordination on volleyball spike
    (2008-07-18) 黃長福; Li-Fang Liu; Gin-Chang Liu; Chiao-Wen Sue; Chen-fu Huang
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    An artificial neural network method for predicting lower limb joint moments from kinematics parameters during counter-movement jump
    (2010-07-23) 黃長福; C. Huang; S. Shih
    The purpose of this study was to develop an artificial neural network (ANN) model for predicting the joint moments of lower limbs using solely the kinematic parameters during counter-movement jump (CMJ). Nine female volleyball players performed CMJ. The joint moments were calculated from experimental data by inverse dynamics (called “measured joint moments” in this study). A “303-3-303 ANN model” was developed with 303 neurons in input layer, three neurons in hidden layer and 303 neurons in output layers. The input variables were the left lower limb extension / flexion joint angles, and the output variables were left lower limb extension / flexion joint moments. The results revealed that the ANN model fitted the experimental data well indicating that the model developed in this study was feasible in the assessment of joint moments for CMJ.
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    Better postural control during accurate shooting in elite female basketball players
    (2011-07-01) 黃長福; Yen-Ting Wang Wang; Tsung-Li Tseng; Lin Chi; Chen-fu Huang; Pao-Cheng Lin; Alex J.Y. Lee
    The purpose of this study was to evaluate the differences of postural control (PC) during accurate and inaccurate shooting in elite female basketball players. 21 female professional basketball players recruited as subjects. The PC was evaluated by the Accusway as sway radius, velocity, radial and 95% area of the center of pressure (COP) during standard penalty line shooting. The results showed that the COP sway area during accurate shooting was significantly smaller than during inaccurate shooting (74.0 � 37.9 vs. 110.6 � 49.1, p < .05). Moreover, no significant differences were found between situations in the COP radius and velocity. This study found that during the accurate shooting, elite female basketball player had better PC which demonstrated that significant smaller COP sway area than inaccurate shooting.
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    Biomechanical analysis of back kicks attack movement in Taekwondo
    (2006-07-18) 黃長福; Chen Lin Lee; Chenfu Huang
    The purpose of this study is to compare three Taekwondo back kicks attack movements. Seven male Taekwondo athletes (age: 21.0 ± 2.0 year old, height: 180.4 ± 4.4cm, weight: 69.1 ± 26.1kg) performed the back kick, jump back kick and 360° jump back kick where the left leg was attack leg. Two Redlake (60Hz) cameras and an accelerometer were used to collect data. The results revealed that the jump back kick’s attack force is greater than in 360° jump back kick. The angular velocity of knee and low trunk of back kick and jump back kick are faster than 360° jump back kick during rotation phase. The 360° jump back kick has a greater attack height and distance when striking the bag. The study suggests back kicking as important skill which the athletes need to practice for improving the kicking ability.
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    Biomechanical Analysis of Standing Long Jump: A 3D Study
    (2009-08-21) 黃長福; C. Huang; R.H. Tang
    Many studies had investigated 2D standing long jump, and some indicated that when jump with optimal load, the jumping performance would be improved. But till now, no study reported the 3D kinetic and kinematic data in standing long jump. The purpose of the study was to compare the kinetic and kinematic difference between restricted arm jump, normal jump, and loaded standing long jump.
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    The biomechanical analysis of the taekwondo front-leg axe-kick
    (2005-08-27) 黃長福; Yeh-Jung Tsai; Guo-Hong Gu; Chia-Jung Lee; Chen-Fu Huang; Chien-Lu Tsai
    The purpose of the study was to analyze the biomechanics of taekwondo front-leg axekick. One force plates, two synchronized high-speed cameras were used to measure biomechanical parameters in each phase of the front-leg axe-kick. The results included: 1. The average reaction time and movement time were 0.423 sand 0.327 s, which respectively occupied about 56% and 44% of attack time. 2. The maximum velocity of hip, knee and ankle were 1.74 m/s, 5.25 m/s and 7.43 m/s respectively. When the kicking leg touched the target, the velocity of knee and ankle were 0.78m/s, 1.72m1s, and 4.64m1s respectively. 3. The peak vertical GRF and impulse were 0.96 SW and 77.57N-s. For decreasing the movement time, it's suggested that an athlete should increase the power and flexibility of lower extremities during the training section.
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    The calculation on the rotational kinematics about the longitudinal axis of javelin by three methods
    (2005-08-27) 黃長福; Guo-Hong Gu; Yeh-Jung Tsai; Chen-Fu Huang
    The motion of javelin is complicated after it is released. Itis necessary to use some skills to calculate the rotation kinematics about the longitudinal axis of javelin. In this study, the Euler angle, the Cardan angle and the screw axis methods were used to calculate these kinematic variables. Two synchronized Redlake high-speed cameras (250 Hz) and a javelin with three fixed reflective markers were used in the experiment. Generally the results by three methods were close, and all of the three methods are suitable for the calculation on these variables. In the Euler angle and Cardan angle methods, the order of rotation sequence needs to be taken account, however no similar problem occurred in screw method. The results suggested that the longitudinal axis should be set as second axis in either Euler angle or Cardan angle methods to avoid Gimbal Lock (singularity) problem.
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