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    <item>
      <title>Veränderungen beim Drehimpuls während des Tennisaufschlages</title>
      <pubDate>Sat, 01 Jan 2000 15:54:35 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4004560</link>
      <guid>https://sponet.de/sponet/Record/4004560</guid>
      <author>Bahamonde, R. E.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Analyse</dc:subject>
      <dc:subject>Bewegung</dc:subject>
      <dc:subject>Biomechanik</dc:subject>
      <dc:subject>Technik</dc:subject>
      <dc:subject>Tennis</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Bahamonde, R. E.</dc:creator>
      <content:encoded><![CDATA[Three-dimensional cinematography and the direct linear transformation method were used to obtain the coordinates of the landmarks of five right-handed collegiate tennis players. A 15-segment model was used to calculate the total body angular momentum about three orthogonal axes (X, parallel to the baseline; Y, normal to baseline and pointing towards the net; and Z, pointing upwards) passing through the centre of mass and to obtain the segmental contribution of the trunk, arms and legs. Most of the clockwise angular momentum about the X-axis was concentrated in the trunk and the racket-arm. Between the events of maximum external rotation and ball impact, the clockwise angular momentum about the X-axis of rotation of most body segments was reduced and the racket-arm gained clockwise angular momentum. The body angular momentum about the Y-axis of rotation had two distinct patterns and was the result of the lateral rotation of the trunk as the racket shoulder was elevated in preparation for impact. This body angular momentum was clockwise from the event of maximum external rotation to impact for the players with the greatest ball speed, whereas it was counterclockwise for the other players. The angular momentum about the Z-axis of rotation was small and lacked a consistent pattern. The largest source of angular momentum in the tennis serve derives from the remote angular momentum about the X- and Y-axes of rotation, which are then transferred from the trunk to the racket-arm and finally to the racket. Near impact, most of the angular momentum (75.1%) was concentrated in the racket-arm. Of the angular momentum of the racket-arm, the largest percentages were concentrated in the racket (35.9%) and the forearm segment (25.7%).]]></content:encoded>
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      <title>Veränderungen im Drehimpuls während des Tennisaufschlags</title>
      <pubDate>Sat, 01 Jan 2000 15:54:35 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3031811</link>
      <guid>https://sponet.de/sponet/Record/3031811</guid>
      <author>Bahamonde, R. E.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Tennis</dc:subject>
      <dc:subject>Auftakt</dc:subject>
      <dc:subject>Technik</dc:subject>
      <dc:subject>Biomechanik</dc:subject>
      <dc:subject>Moment</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Bahamonde, R. E.</dc:creator>
      <content:encoded><![CDATA[Ziel der vorliegenden Untersuchung war die Analyse der dreidimensionalen Veränderungen im Drehimpuls während der Ausführung des Tennisaufschlages. Probanden waren 5 rechtshändige Collegetennisspieler. Angewandte Methoden: 3D-Kinematographie und direkte lineare Transformationsmethode.
Ergebnisse: Die Ergebnisse der Untersuchung stützen die Theorie von PAYNE (1978), dass der Drehimpuls während des Tennisaufschlages ein drei-Hebel-System darstellt, das Oberkörper, Arm und Schläger einbezieht. Diese System ermöglicht  den Spielern einen Drehimpuls über der X-Rotationsachse zu erzeugen, was vom Oberkörper über den Arm bis zum Schläger verlagert wird.]]></content:encoded>
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