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    <item>
      <title>Leptin- und Steroidhormonreaktionen auf Belastung bei jugendlichen Läuferinnen über eine Saison von 7 Wochen</title>
      <pubDate>Mon, 01 Jan 2001 01:55:23 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3033909</link>
      <guid>https://sponet.de/sponet/Record/3033909</guid>
      <author>Kraemer, R. R.</author>
      <author>Acevedo, E. O.</author>
      <author>Synovitz, L. B.</author>
      <author>Hebert, E. P.</author>
      <author>Gimpel, T.</author>
      <author>Castracane, V. D.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Langstreckenlauf</dc:subject>
      <dc:subject>Nachwuchsleistungssport</dc:subject>
      <dc:subject>weiblich</dc:subject>
      <dc:subject>Hormon</dc:subject>
      <dc:subject>Fett</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Kraemer, R. R.</dc:creator>
      <dc:creator>Acevedo, E. O.</dc:creator>
      <dc:creator>Synovitz, L. B.</dc:creator>
      <dc:creator>Hebert, E. P.</dc:creator>
      <dc:creator>Gimpel, T.</dc:creator>
      <dc:creator>Castracane, V. D.</dc:creator>
      <content:encoded><![CDATA[7 jugendliche Langstreckenläuferinnen absolvierten während der normalen Trainingszeit drei diskontinuierlich ansteigende Belastungstests bis zur Erschöpfung (GXT) in der 1., 4. und 7. Woche ihrer 7-wöchigen Saison. 
Im Vergleich mit Woche 1 stieg die VO2max während der Saison signifikant und war in der 4. Woche 10% und in der 7. Woche 7% höher. In Reaktion auf die drei Tests stiegen die Spiegel von DHEA, DHEAS, Kortisol, Testosteron und Leptin signifikant. Der Testosteronspiegel veränderte sich ebenfalls im Verlauf der Untersuchung. Ruhe-Testosteron und Belastungs-Testosteron waren in der 4. und 7. Woche höher als in der 1. Woche. Die Ruhespiegel und akuten Anstiege der anderen Hormone veränderten sich während der Saison nicht. Es scheint, dass DHEA, DHEAS, Kortisol, Testosteron und Leptin in Reaktion auf Laufen bei jugendlichen Läuferinnen ansteigen. Training und/oder Reife erhöhen die Ruhe- und Belastungs-Testosteronspiegel während einer Trainingssaison.]]></content:encoded>
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    <item>
      <title>Leptin- und Steroidhormonreaktion auf Belastung bei jugendlichen Langstreckenläuferinnen über eine 7-Wochen-Saison</title>
      <pubDate>Mon, 01 Jan 2001 01:55:23 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4006470</link>
      <guid>https://sponet.de/sponet/Record/4006470</guid>
      <author>Kraemer, R. R.</author>
      <author>Acevedo, E. O.</author>
      <author>Synovitz, L. B.</author>
      <author>Hebert, E. P.</author>
      <author>Gimpel, T.</author>
      <author>Castracane, V. D.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Belastung</dc:subject>
      <dc:subject>Hormon</dc:subject>
      <dc:subject>Langstreckenlauf</dc:subject>
      <dc:subject>Nachwuchsleistungssport</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:subject>weiblich</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Kraemer, R. R.</dc:creator>
      <dc:creator>Acevedo, E. O.</dc:creator>
      <dc:creator>Synovitz, L. B.</dc:creator>
      <dc:creator>Hebert, E. P.</dc:creator>
      <dc:creator>Gimpel, T.</dc:creator>
      <dc:creator>Castracane, V. D.</dc:creator>
      <content:encoded><![CDATA[The purpose of the study was to investigate the responses of leptin and steroid hormones to maximal exercise in adolescent female runners over a competitive season. Seven adolescent female distance runners completed three testing trials during weeks 1, 4 and 7 of their high-school track season. Blood samples were collected before and after a discontinuous graded exercise test to exhaustion (GXT) for each trial. Tests were administered during the subjects' normal training time (3:30 p.m.-5:00 p.m.). Compared to week 1, peak O2 uptake rose significantly during the season and was 10% and 7% higher at weeks 4 and 7, respectively. Levels of dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulfate (DHEAS), cortisol, testosterone, and leptin increased significantly in response to the graded exercise tests. Testosterone levels were also changed over the course of the study. Resting testosterone levels and testosterone responses to exercise in weeks 4 and 7 were both higher than in week 1. Resting concentrations and acute increases of the other hormones were not changed over the season. It appears, therefore, that DHEA, DHEAS, cortisol, testosterone and leptin concentrations increase in response to running in adolescent female runners. Data also suggest that training and/or maturation increases resting testosterone concentrations and testosterone responses to running in adolescent female runners during a training season.]]></content:encoded>
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