Effects of the Ball Mass on Mechanical Properties and Training

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Project title/計畫英文名

Project Number/計畫編號

MOST 106-2410-H-033-037-

Translated Name/計畫中文名

不同重量排球之力學特性與訓練應用

Project Principal Investigator/計畫主持人

Lin, Kuo-Chuan

Funding Organization/主管機關

國家科學及技術委員會

Department/Unit/單位系所

Office of Physical Education

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

30-09-2018

在排球競賽中發球、扣球、接球的速度都相當的快。球體的活性、彈性等都深切的影響比賽並與規則緊緊相連。而球體的重量、表面材質與內部的壓力等，在碰撞的瞬間所產生的物理效應會直接影響球員的運動表現。所以，在進行輔助性器材設計之前，應該先藉由運動科學的方法，準確的測量其物理特性，藉此回饋給製造廠商，以便調配出不同功能性結構之球體。因此，本研究旨在探討不同重量排球之力學特性與訓練應用之成效。首先，以發球機與測力板測量球體的動態力學特徵 (contact time, mean force, peak force, total impulse, ball velocity, initial momentum, incident impulse, and lost momentum)。接著再招募36 名排球選手，並將其分為輕量組、加重組、Conti 組與控制組進行六周的接發球訓練，並每兩周評估其成效。在資料分析上，以Intraclass correlation coefficients (ICC)考驗所獲資料之信賴度，再以趨勢分析 (Trend Analysis) 檢驗三種重量球體的差異性。而在訓練成效的考驗上，採用二因子混合設計變異數分析 (two-way mixed design ANOVA) 考驗不同組別與不同階段之表現差異，本研究水準設為α =.05。
In volleyball competitions, the ball is served, spiked, and received at high speeds. The liveliness and bounce of the ball are closely connected to the competition and rules. The weight, surface material, and internal pressure of the ball, and the physical effects created at the moment of collision, will directly influence athletes’ performance. Thus, before designing assistive equipment, it is necessary to measure the trends of the physical properties of the equipment accurately and to feedback relevant data to the manufacturers so that they may create balls with different functional structures. Therefore, this study aimed to explore the changes in the mechanical properties of volleyballs with various mass and applied it in reception training. Firstly, the dynamic mechanical properties (contact time, mean force, peak force, total impulse, ball velocity, initial momentum, incident impulse, and lost momentum) of those volleyballs were examined by launch machine and force plate. In this study, thirty-six volleyball players will be recruited and divide into smaller mass group (SMG), greater mass group (GMG), Conti regulation ball group (CRBG) and control group (CG). The participants will be asked to perform a six-week training program and be evaluated two weeks a time. The obtained data were then examined with Intraclass correlation coefficients (ICC) to determine their reliability. Trend Analysis was then used to examine the differences in volleyballs of different weights. Regarding to the results of training effects, the two-way mixed design ANOVA was applied to test the differences between groups and training phases. The significant level was set at α =.05.

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Effects of the Ball Mass on Mechanical Properties and Training

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