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    <item>
      <title>Venöser Blutlaktatanstieg nach Hochsprüngen bei Volleyballspielern</title>
      <pubDate>Mon, 01 Jan 2001 17:00:37 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032938</link>
      <guid>https://sponet.de/sponet/Record/3032938</guid>
      <author>Chamari, K.</author>
      <author>Ahmaidi, S.</author>
      <author>Blum, J. Y.</author>
      <author>Hue, O.</author>
      <author>Temfemo, A.</author>
      <author>Hertogh, C.</author>
      <author>Mercier, B.</author>
      <author>Prefaut, C.</author>
      <author>Mercier, J.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Schnellkraft</dc:subject>
      <dc:subject>Sprung</dc:subject>
      <dc:subject>Hochsprung</dc:subject>
      <dc:subject>Laktat</dc:subject>
      <dc:subject>anaerob</dc:subject>
      <dc:subject>Energiestoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Chamari, K.</dc:creator>
      <dc:creator>Ahmaidi, S.</dc:creator>
      <dc:creator>Blum, J. Y.</dc:creator>
      <dc:creator>Hue, O.</dc:creator>
      <dc:creator>Temfemo, A.</dc:creator>
      <dc:creator>Hertogh, C.</dc:creator>
      <dc:creator>Mercier, B.</dc:creator>
      <dc:creator>Prefaut, C.</dc:creator>
      <dc:creator>Mercier, J.</dc:creator>
      <content:encoded><![CDATA[In der Untersuchung wird die Hypothese überprüft, dass die venösen Blutlaktatkonzentrationen von Beginn kurzer Belastung an varrieren. 11 männliche Volleyballspieler, mittleres Alter 18,5 Jahre, absolvierten drei Belastungstests mit unterschiedlichen Ausführung und Ruhepausen von 45 min. Nach dem 1. Tests, ein einzelner maximaler Sprung, stieg das venöse Laktat signifikant in der 1. (t1), 3. (t3) und 5. Ruheminute (t5). Der 2. Test, 6 maximale Sprünge mit 20 sec Pause, zeigte unverändertes Laktat in Bezug zu den Ausgangswerten. Nach dem 3. Test, 6 maximale Sprünge hintereinander, waren t3 und t5 signifikant erhöht. Es wird geschlussfolgert, dass nach Hochsprüngen ein signifikanter Anstieg von venösem Blutlaktat auftritt.]]></content:encoded>
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    <item>
      <title>Anstieg von venösen Blutlaktat nach Hochsprüngen von Volleyballspielern</title>
      <pubDate>Mon, 01 Jan 2001 17:00:37 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4005651</link>
      <guid>https://sponet.de/sponet/Record/4005651</guid>
      <author>Chamari, K.</author>
      <author>Ahmaidi, S.</author>
      <author>Blum, J. Y.</author>
      <author>Hue, O.</author>
      <author>Temfemo, A.</author>
      <author>Hertogh, C.</author>
      <author>Mercier, B.</author>
      <author>Prefaut, C.</author>
      <author>Mercier, J.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Volleyball</dc:subject>
      <dc:subject>Sprung</dc:subject>
      <dc:subject>Schnellkraft</dc:subject>
      <dc:subject>Laktat</dc:subject>
      <dc:subject>Energiestoffwechsel</dc:subject>
      <dc:subject>anaerob</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Chamari, K.</dc:creator>
      <dc:creator>Ahmaidi, S.</dc:creator>
      <dc:creator>Blum, J. Y.</dc:creator>
      <dc:creator>Hue, O.</dc:creator>
      <dc:creator>Temfemo, A.</dc:creator>
      <dc:creator>Hertogh, C.</dc:creator>
      <dc:creator>Mercier, B.</dc:creator>
      <dc:creator>Prefaut, C.</dc:creator>
      <dc:creator>Mercier, J.</dc:creator>
      <content:encoded><![CDATA[The aim of this study was to test the hypothesis that venous blood lactate concentrations ([La-]) would vary from the beginning of brief exercise. Maximal vertical jumping was used as a model of brief intense exercise. Eleven healthy male volleyball players, aged [mean (SE)] 18.5 (0.7) years, performed three exercise tests with different protocols, each separated by quiet seated recovery periods of 45 min. After the first test, consisting of a single maximal jump [lasting 0.6 s for the pushing phase, and in which the subjects jumped 64 (2.2) cm], forearm venous [La-] increased significantly with respect to rest at 1 min (t1), 3 min (t3), and 5 min (t5) of recovery. The second test, comprising six maximal jumps, each separated by 20-s recovery periods, resulted in an unchanged [La-] with respect to the baseline value. After the third test [i.e., six consecutive maximal jumps that lasted a total of 7.36 (0.33) s], [La-] increased significantly at t3 and t5 with respect to the pre-test value (F=10.3, P<0.001). We conclude that a significant venous [La-] increase occurs after vertical jumping. This result may be explained by the activation of lactic anaerobic metabolism at the very onset of exercise, which participates in energy production and/or in the resynthesis of the phosphocreatine that was used during such brief exercise. ]]></content:encoded>
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