網球平擊發球動力傳遞

Kinetic Flow in the Tennis Flat Serve

10.6194/SCS.2007.08.03

羅國城(Kuo-Cheng Lo)；五苓華(Lin-Hwa Wang)

網球 ； 平擊發球 ； 上肢 ； 角動量 ； 線動量 ； tennis ； flat serve ； upper extremity ； linear momentum ； angular momentum

運動教練科學

8期（2007 / 07 / 01）

19 - 27

繁體中文

本研究之主要目的在探討上肢各肢段在執行網球發球之線動量與角動量，了解上肢在整體發球動作中的施力順序。本研究以六位慣用右手的男性全能網球選手為受試者，並且利用HiRES三度空間運動分析系統，收集各受試者發球時的肢體運動軌跡影像資料。經討論分析後，獲致結論如下：肢段線動量的變化量是產生肢段力量的來源，角動量的變化量大小攸關產生力矩的大小；在整個網球發球的過程中，從伸臂至擊球期間，線動量急速增加，產生瞬間力量提供強而有力的發球，旋轉角動量的變化較線動量的變化小，產生的旋轉效應較小。此外，手和上臂的角動量在平擊發球的擊球瞬間趨近於零，使球拍穩定的向正確擊球方向移動。本研究以平擊式發球的結果可應用於各上肢肢段不同發球技術及網球擊球動作分析。

The purposes of the study were to investigate the linear and angular momentums of upper extremity segments during tennis flat serve, and to determine the power transfer sequences and rhythms of the upper extremity whiling serving. Six elite right-dominant male tennis players were tested and the three-dimensional motion analysis system, HiRES, was adopted. The results showed segment forces originated from the variation of the linear momentums of the segments of upper extremity. The variation of the angular momentums had significant influences on the momentum degrees. During the entire flat-serve process, from stretching arms to stroke the ball, the linear momentum increased rapidly and produced the instant power to make powerful serves. The variation of the rotation momentums was smaller than the linear ones and thus led to the smaller rotation effects. Furthermore, the angular momentums of the hand and the forearm were nearly zero at the instance of impact which is important to keep the racket stable and in precise direction towards the ball. The finding of the study on the flat serving can be used to analyze the different ways of tennis serving and stroke techniques among different segments.

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