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      <title>Auswirkungen von Koffeinzufuhr auf die Zeitfahrleistung im Radsport</title>
      <pubDate>Tue, 01 Jan 2008 09:19:49 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4016891</link>
      <guid>https://sponet.de/sponet/Record/4016891</guid>
      <author>McNaughton, L. R.</author>
      <author>Lovell, R. J.</author>
      <author>Siegler, J.</author>
      <author>Midgley, A. W.</author>
      <author>Moore, L.</author>
      <author>Bentley, D. J.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Genussmittel</dc:subject>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:tag>Zeitfahren</dc:tag>
      <dc:tag>Koffein</dc:tag>
      <dc:format>Artikel</dc:format>
      <dc:creator>McNaughton, L. R.</dc:creator>
      <dc:creator>Lovell, R. J.</dc:creator>
      <dc:creator>Siegler, J.</dc:creator>
      <dc:creator>Midgley, A. W.</dc:creator>
      <dc:creator>Moore, L.</dc:creator>
      <dc:creator>Bentley, D. J.</dc:creator>
      <content:encoded><![CDATA[The purpose of this work was to determine the effects of caffeine on high intensity time trial (TT) cycling performance in well-trained subjects. Subjects: Six male cyclists with the following physical characteristics (mean ± SD) age 30.7 ± 12, height 179.3 ± 7.5 cm, mass 70.0 ± 7.5 kg, VO2max 65.0 ± 6.3 mL·kg-1·min-1 undertook three 1-h TT performances, control (C), placebo (P) and caffeine (CAF), on a Velotron cycle ergometer conducted in a double-blind, random fashion. Sub­jects rested for 60 min and were then given CAF or P in a dose of 6 mg·kg-1 body mass and then commenced exercise after another 60 min of rest. Before ingestion, 60 min postingestion, and at the end of the TT, finger-prick blood samples were analyzed for lactate. Results: The cyclists rode significantly further in the CAF trial (28.0 ± 1.3 km) than they did in the C (26.3 ± 1.5 km, P < .01) or P (26.4 ± 1.5 km, P < .02) trials. No differences were seen in heart rate data throughout the TT (P > .05). Blood lactate levels were significantly higher at the end of the trials than either at rest or postingestion (P < .0001), but there were no differences between the three trial groups. Conclusion: On the basis of the data, we concluded that performance was improved with the use of a caffeine supplement.]]></content:encoded>
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    <item>
      <title>Die Auswirkungen von Koffeinaufnahme auf die Leistung im Rad-Zeitfahren</title>
      <pubDate>Tue, 01 Jan 2008 09:19:49 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4015144</link>
      <guid>https://sponet.de/sponet/Record/4015144</guid>
      <author>Mc Naughton, L. R.</author>
      <author>Lovell, R. J.</author>
      <author>Siegler, J. C.</author>
      <author>Midgley, A. W.</author>
      <author>Sandstrom, M.</author>
      <author>Bentley, D. J.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Genussmittel</dc:subject>
      <dc:subject>ergogenes Mittel</dc:subject>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Mc Naughton, L. R.</dc:creator>
      <dc:creator>Lovell, R. J.</dc:creator>
      <dc:creator>Siegler, J. C.</dc:creator>
      <dc:creator>Midgley, A. W.</dc:creator>
      <dc:creator>Sandstrom, M.</dc:creator>
      <dc:creator>Bentley, D. J.</dc:creator>
      <content:encoded><![CDATA[Aim. The purpose of this work was to determine the effects of caffeine ingestion on cycling time trial (TT) performance in well trained male subjects.
Methods. Eight males, with the following physical characteristics (Mean ± SD) age 30.2±10.1 years, height 180.3±7.1 cm, mass 70.4±5.1 kg, V.O2max 63.6±4.4 mL/kg.min undertook three 1 h TT performances on a VelotronPro® cycle ergometer, in a double blind, random fashion. The trials were Control (C), Placebo (Pl) and Caffeine (CAF). The CAF and Pl were given 60 min prior to exercise in a dose of 6 mg/kg body mass. Prior to ingestion, 60 min post ingestion, and at the end of the TT, subjects gave 10 mL of venous blood which was analysed for lactate, glucose, and free fatty acids. Expired air was collected throughout each test by indirect calorimetry.
Results. The cyclists rode significantly further in CAF trial (28.11±1.32 km) than they did in the C (26.69±1.5 km, P<0.03) or Pl (27.0±1.5 km, P<0.03) trials. No significant differences were seen between C and Pl trials (P>0.88). No differences between C and Pl were seen in heart rate data throughout the TT (p>0.05). The free fatty acid (FFA) concentrations were significantly higher in the CAF trials both post ingestion (P<0.005) and post exercise (P<0.0001) than either C or Pl trials.
Conclusion. We concluded that performance was improved possibly based upon a greater reliance on fat metabolism, as indicated by increased FFA and a lower respiratory exchange ratio (RER).]]></content:encoded>
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