Der Griechische Volleyballverband setzt in der Talentdiagnostik folgende Tests ein: 30-m-Sprint Kugelstoßen (1 kg) Weitsprung aus dem Stand Neben diesen einfachen Werten der körperlichen Leistungsfähigkeit wurden folgende Werte mit Bezug zur Kraft/Schnellkraft erhoben: maximale isometrische Abdruckkraft vertikaler Tiefsprung mit sofortigem Aufsprung vertikaler Sprung mit gebeugter Hüfte, gebeugtem Knie und Fußgelenk Niedersprünge aus 10 bis 30 cm Höhe maximale Pedalumdrehungsfrequenz ohne Widerstand. Zwischen den drei Werten der allgemeinen körperlichen Leistungsfähigkeit wurde eine hohe Korrelation festgestellt. Der Vergleich der Leistungen in diesen Tests und den Kraft/Schnellkrafttests wurde festgestellt: eine hohe Korrelation zwischen den drei allgemeinen Werten und der maximalen Pedalumdrehungsfrequenz. - mittlere Korrelationen zwischen den allgemeinen Werten und der maximalen isometrischen Abdruckkraft. Mit den anderen Kraft/Schnellkraftwerten wurden keine Korrelationen festgestellt. Im Ergebnis wird der Einsatz der Tests in Frage gestellt, da sie nur bedingt aussagefähig für die Sportart Volleyball sind. INTRODUCTION: Selection of the most talented young athletes frequently necessitates the screening of a large number of youngsters. For practical purposes in most sports, including volleyball, screening is limited to a small number of simple physical activities (SPA). It is questionable how well the particular SPA measure characteristics of physical conditioning which may be important for success in the sport. Therefore the purpose of this study was to: 1) measure characteristics of physical conditioning relating to strength and/or speed (CPC) in youngsters who were just selected to begin practicing volleyball on the basis of their performance in SPA, and 2) examine the relationship between the results of the SPA and the measured CPC. METHODS: Seventeen youngsters (mean age=9.3 years) were selected by the Greek Volleyball Federation to begin practicing the sport on the basis of their performance in the following SPA: a) 30 meter sprint, b) shot putting 1 Kg, and 3) standing long jump. On the basis of previous research, the 17 youngsters` CPC relating to speed and strength was measured by testing them on: 1) maximum isometric push-off force (Fmax), 2) vertical countermovement jump (CMJ), 3) vertical jump from a flexed hip, knee, and ankle joint position (SJ), 4) drop vertical jumps from heights of 10-30cm (DJ), and 5) maximum pedaling rate (zero resistance). RESULTS: The results revealed high correlation between the performance in the 3 SPA (r=0.93-0.99, p<.001). Comparison between the performance in the 3 SPA and the performance in the 5 CPC revealed: 1) high correlations between the performance in the 3 SPA and maximum pedaling rate (r=0.93, p<.001), 2) moderate correlations between the performance in the 3 SPA and Fmax (r=-0.38), and 3) non significant correlations between the performance in the 3 SPA and the remaining CPC. CONCLUSION: The results of this study revealed that the performance in the 3 SPA utilized by the Greek Volleyball Federation correlates highly to only one of the measured CPC, moderately to a second CPC, and does not significantly correlate to the remaining measured CPC. Based on these results, the appropriateness of the 3 PA as tools in the identification of CPC is questioned. It is difficult to further improve CPC, if the tools utilized to identify them are questionable.
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