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    <item>
      <title>Kurzzeitiges Übertraining: Einflüsse auf Leistung, Kreislaufreaktionen und Herzfrequenzvariabilität</title>
      <pubDate>Sat, 01 Jan 2000 03:39:12 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032102</link>
      <guid>https://sponet.de/sponet/Record/3032102</guid>
      <author>Hedelin, R.</author>
      <author>Kentta, G.</author>
      <author>Wiklund, U.</author>
      <author>Bjerle, P.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Übertraining</dc:subject>
      <dc:subject>Kanusport</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Herz</dc:subject>
      <dc:subject>Kreislauf</dc:subject>
      <dc:subject>Hormon</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:subject>Herzfrequenz</dc:subject>
      <dc:subject>Variabilität</dc:subject>
      <dc:subject>Herzfrequenzvariabilität</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Hedelin, R.</dc:creator>
      <dc:creator>Kentta, G.</dc:creator>
      <dc:creator>Wiklund, U.</dc:creator>
      <dc:creator>Bjerle, P.</dc:creator>
      <content:encoded><![CDATA[9 Elite-Kanusportler  wurden während eines 6-tägigen Trainingslagers hinsichtlich Veränderungen in der Leistung, Herzfrequenzvariabilität (HRV) und blutchemischer Parameter untersucht. Das Training bestand aus Skilanglaufen und Krafttraining, der Trainingsumfang betrug 13,0+/-1,6 Stunden, was einem Anstieg der Trainingsbelastung von 50% entsprach.
Ergebnisse:
- Abnahme der Abbruchzeit und von Laktatmax
- Abnahme der HF
- Anstieg Plasmavolumen 
- Abnahme Ruhekortisol, Ruheadrenalin und -noradrenalin blieben unverändert
- keine Veränderung der HRV]]></content:encoded>
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    <item>
      <title>Kurzzeitiges Übertraining: Einflüsse auf Leistung, Kreislaufreaktionen und Herzfrequenzvariabilität</title>
      <pubDate>Sat, 01 Jan 2000 03:39:12 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4004607</link>
      <guid>https://sponet.de/sponet/Record/4004607</guid>
      <author>Hedelin, R.</author>
      <author>Kentta, G.</author>
      <author>Wiklund, U.</author>
      <author>Bjerle, P.</author>
      <author>Henriksson-Larsen, K.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Cross</dc:subject>
      <dc:subject>Kanusport</dc:subject>
      <dc:subject>Kreislauf</dc:subject>
      <dc:subject>Übertraining</dc:subject>
      <dc:subject>Herzfrequenz</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Hedelin, R.</dc:creator>
      <dc:creator>Kentta, G.</dc:creator>
      <dc:creator>Wiklund, U.</dc:creator>
      <dc:creator>Bjerle, P.</dc:creator>
      <dc:creator>Henriksson-Larsen, K.</dc:creator>
      <content:encoded><![CDATA[Purpose and Methods: Nine elite canoeists were investigated concerning changes in performance, heart rate variability (HRV), and blood-chemical parameters over a 6-d training camp. The training regimen consisted of cross-country skiing and strength training, in total 13.0 ± 1.6 h, corresponding to a 50% increase in training load. Results: Time to exhaustion (RunT) decreased from 19.1 ± 1.0 to 18.0 ± 1.2 min (P < 0.05). V[dot]O2max and max lactate (Lamax) both decreased significantly (P < 0.05) over the training period (4.99 ± 0.97 to 4.74 ± 0.98 L·min-1 and from 10.08 ± 1.25 to 8.98 ± 1.03 mmol·L-1 respectively). Heart rates (HR) decreased significantly at all workloads. Plasma volume increased by 7 ± 7% (P < 0.05). Resting cortisol, decreased from 677 ± 244 to 492 ± 222 nmol·L-1 (P < 0.05), whereas resting levels of adrenaline and noradrenaline remained unchanged. The change between tests in RunT correlated significantly with the change in HRmax (r = 0.79; P = 0.01). There were no group changes in high or low frequency HRV, neither at rest nor following a tilt. Conclusions: The reduced maximal performance indicates a state of fatigue/overreaching and peripheral factors are suggested to limit performance even though HRmax and Lamax both were reduced. The reduced submaximal heart rates are probably a result of increased plasma volume. HRV in this group didn't seem to be affected by short-term overtraining.]]></content:encoded>
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