本研究的主要目的在探討不同網球發球方向(相容性)及發球前期對接發球反應時間(RT)與動作時間(MT)的影響。本研究的受試者為體育系慣用右手者男生50名，平均年齡為22.44士1.97歲，平均身高為174.14+6.41-A分，平均體重為69.2士8.81-公斤。分別觀看由一位甲組球員發網球的錄影帶，此影片係經專哲人士處理後使畫面形成五種不同的發球前期畫面及兩種不同的發球方向，每種發球方向及前期各出現5;犬的發球動作，共觀看到個發球畫面。受試者在觀看每個發球畫面後，需先判斷發球方向後再往發球方向移動並按鍵，以測試RT與加叮。研究結汞發現:一、在RT上，不同的網球發球方向與發球前期間無交互作用的關係存在，且對不同發球方向時的RT並沒有顯著不同;但在不同的發球前期土，在較適中的前期長度(2.5-- 5秒)能產生較快的RT'但在較短的前期( 1.5秒)和較長的前期(8秒)則產生較慢的RT 0 二、在MT上，不同的網球發球方向與發球前期間有交互作用的關係存在。在不同的發球方向土，受試者對發向右邊比發向左邊時的MT快;在不同前期土，MT受前期的影響較小，僅在發球方向是左邊時，於前期1.5秒與2 秒時的品叮比前期8秒時的MT快。

The purpose of this study was to investigate the effects of variable foreperiods and compatibility of tennis serve on reaction time (RT) and movement time (MT). Forty righthanded males of National Taiwan Normal University in the Department of Physical Education were studied， mean age 22.44 ± 1.97yrs， height 174.14士6.41 em， weight 69.2 + 8.81 kg. Each subject separately watched the film in which one senior-level tennis player was serving a ball. Thisfilm had been processed by a professional person into tennis services of 5 variable foreperiods， 2 different orientations and had totally 50 pictures for serving a ball. Afterwatching a designated picture for serving a ball， the subject had to decide whether the ball would be served to the left or right side. Upon deciding， the subject would press a button indicating which side the ball would be served to. By doing this， we could measure their RT and MT， the data obtained of RT and MT are the following results : 1.In the RT circumstance there were not mutual functions in tennis service between different orientations and variable foreperiods. Furthermore there was not significant different orientations of both the right and left sides. In variable fore periods， the foreperiods of 2.5-5 seιwas a significantly faster than 1.5 sec. and 8 sec. on RT. 2. In the MT circumstance there were mutual functions in tennis service between different orientations and variable foreperiods. In the different orienta，tions， the right side was significantly faster than the left on MT. In variable foreperiods， the effects had no significant difference on MT， only serving a ball in the direction of the left， the foreperiods of 1.5sec. and 2 sec. was a significantly faster than 8 sec. on MT.