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The purpose of this study was to examine the real time gameanalysis system of water polo and to inspect the practicality of thissystem. Fifteen matches of 1994 Asian Games in Hiroshima wereanalyzed. Four observers and one operator were stationed on theofficial table. Two of these observers were in pairs, and took thehalf of the field of play. They collected and recorded informationsof the game. These informations were inputted(Macintosh PB520) by theoperator and computerized by the program that we made out. These datawere saved into micro floppy disk and send to the anteroom for theofficials. After the end of the game, the data related to shootingand personal fouls were outputted (Macintosh Centris 650 and HewlettPackard Desk Writer), and were offered to the coach of the JapaneseNational Water Polo Team. In order to test the reliability of thesedata, all matches were recorded on VCR. Reliability and practicalityof this system were tested by comparison with the data obtained fromVCR and by discussion among the stuff and coach. The results are asfollows:

1)There were high ratio of agreement(91.8%~100.0%) andcoefficients of correlation between the data obtained from thissystem and VCR analysis (p<0.001).

2)There was adequacy for the data obtained from this systembecause the items of analysis were determined on demand of the coach.

3)The data obtained from this system were useful for meeting andscouting. Consequently, it was proved that our real time gameanalysis system of water polo was practically and reliable.

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