運動中應用視覺訊息之探討－以單手接球動作爲例

目的：爲了檢驗視覺訊息對接球動作之影響，本研究探討不同參與者間的τ值是否有差異以及參與者內的τ值是否存在穩定特質。方法：本研究以10位大學男生爲對象，進行接球測驗，並以Mega-speed高速攝影機(120Hz)及Kwon3D動作分析軟體（濾波爲6Hz）收集與分析參數資料，τ值計算爲「接球者眼睛和來球相距」除以「手部啟動瞬間水平球速」得知。以獨立樣本單因子變異數分析考驗不同參與者τ值的差異情形，透過相依樣本t考驗以及變異係數個別比較兩階段測驗的差異情形，統計顯著水準皆定爲α=.05。結果：一、不同參與者的τ值有顯著差異。二、大部分的參與者之兩階段測驗τ值成對樣本t檢定都未達顯著差異，而且除了一位參與者在第一階段測驗之τ值變異係數明顯偏高外，其餘參與者兩階段測驗之τ值變異係數尚且穩定。結論：本研究之結果證實在光線明亮的情況下，接球者內仍有穩定的τ值以及不同接球者間有不同的τ值存在。

關鍵字

視覺訊息； τ ；單手接球

並列摘要

Purpose: To understand the effect of vision to the ball-catching movement, the study was to examine the difference of τ (tau) value among and within all participants. Methods: We adopted ten male college students to join the study of one-hand ball catching. A mega speed camera (120 Hz) and the Kwon 3D motion analysis system were used to collect and analyze the kinematics parameters. The τ (tau) values (the quotient of the distance between the eye of the catcher and the ball and its rate of change) were calculated by these data. The study adapted one-way ANOVA to examine the difference among all subjects. The study also examined the difference of τ values of the two stages within these subjects according to the result of paired t-test and coefficient of variation. Results: 1. The τ values among all subjects were significantly different. 2. The τ values within most of all subjects did not show the significant differences. Furthermore, τ values of the stages within most of all participants remained steady except for only one participants' τ values showed higher in first stage. Conclusion: There exist stable τ values within the subjects, but these τ values change between them in bright environment.