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    <item>
      <title>Wirkung von Kreatinsupplementierung auf Stoffwechsel und Leistung des Menschen während unterbrochener Radsprints</title>
      <pubDate>Mon, 01 Jan 2001 08:29:52 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032573</link>
      <guid>https://sponet.de/sponet/Record/3032573</guid>
      <author>Finn, J. P.</author>
      <author>Ebert, T. R.</author>
      <author>Withers, R. T.</author>
      <author>Carey, M. F.</author>
      <author>Mackay, M.</author>
      <author>Phillips, J. W.</author>
      <author>Febbraio, M. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Ergometrie</dc:subject>
      <dc:subject>Sprint</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Kreatin</dc:subject>
      <dc:subject>Supplementierung</dc:subject>
      <dc:subject>Triathlon</dc:subject>
      <dc:subject>intermittierend</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Finn, J. P.</dc:creator>
      <dc:creator>Ebert, T. R.</dc:creator>
      <dc:creator>Withers, R. T.</dc:creator>
      <dc:creator>Carey, M. F.</dc:creator>
      <dc:creator>Mackay, M.</dc:creator>
      <dc:creator>Phillips, J. W.</dc:creator>
      <dc:creator>Febbraio, M. A.</dc:creator>
      <content:encoded><![CDATA[Bei 16 Triathleten wurde die Wirkung von oraler Kreatinsupplementierung (4x5 g über 5 Tage) auf maximale Fahrradergometersprints (4x20 s) untersucht. 
Ergebnis:  Kreatinsupplementierung erhöht die intramuskulären Speicher freien Kreatins, hat jedoch keine ergogene Wirkung auf 4x20 s-Sprints mit Pausen von 20 s.]]></content:encoded>
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    <item>
      <title>Wirkung von Kreatinsupplementierung auf Stoffwechsel und Leistung beim Menschen während unterbrochener Radsprints</title>
      <pubDate>Mon, 01 Jan 2001 08:29:52 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4005365</link>
      <guid>https://sponet.de/sponet/Record/4005365</guid>
      <author>Finn, J. P.</author>
      <author>Ebert, T. R.</author>
      <author>Withers, R. T.</author>
      <author>Carey, M. F.</author>
      <author>Mackay, M.</author>
      <author>Phillips, J. W.</author>
      <author>Febbraio, M. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Supplementierung</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:subject>Sprint</dc:subject>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Kreatin</dc:subject>
      <dc:subject>intermittierend</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Finn, J. P.</dc:creator>
      <dc:creator>Ebert, T. R.</dc:creator>
      <dc:creator>Withers, R. T.</dc:creator>
      <dc:creator>Carey, M. F.</dc:creator>
      <dc:creator>Mackay, M.</dc:creator>
      <dc:creator>Phillips, J. W.</dc:creator>
      <dc:creator>Febbraio, M. A.</dc:creator>
      <content:encoded><![CDATA[This double blind study investigated the effect of oral creatine supplementation (CrS) on 4 × 20 s of maximal sprinting on an air-braked
cycle ergometer. Each sprint was separated by 20 s of recovery. A group of 16 triathletes [mean age 26.6 (SD 5.1) years. mean body mass 77.0 (SD 5.8) kg, mean body fat 12.9 (SD 4.6)%, maximal oxygen uptake 4.86 (SD 0.7) l · min-1] performed an initial 4 × 20 s trial after a muscle biopsy sample had been taken at rest. The subjects were then matched on their total intramuscular creatine content (TCr) before being randomly  assigned to groups to take by mouth either a creatine supplement (CRE) or a placebo (CON) before a second 4 × 20 s trial. A muscle biopsy sample was also taken immediately before this second trial. The CrS of 100 g comprised 4 × 5 g for 5 days. The initial mean TCr were 112.5 (SD 8.7) and 112.5 (SD 10.7) mmol · kg-1 dry mass for CRE and CON, respectively. After creatine loading and placebo ingestion respectively, CRE [128.7 (SD 11.8) mmol · kg-1 dry mass] had a greater (P=0.01) TCr than CON [112.0 (SD 10.0) mmol · kg-1 dry mass]. While the increase in free creatine for CRE was statistically significant (P=0.034), this was not so for the changes in phosphocreatine content [trial 1: 75.7 (SD 6.9), trial 2: 84.7 (SD 11.0) mmol · kg-1 dry mass, P=0.091]. There were no significant differences between CRE and CON for citrate synthase activity (P=0.163). There was a tendency towards improved performance in terms of 1 s peak power (in watts P=0.07; in watts per kilogram P=0.05), 5 s peak power (in watts P=0.08) and fatigue index (P=0.08) after CrS for sprint 1 of the second trial. However, there was no improvement for mean power (in watts P=0.15; in watts per kilogram P=0.1) in sprint 1 or for any performance values in subsequent sprints. Our results suggest that, while CrS elevates the intramuscular stores of free creatine, this does not have an ergogenic effect on 4 × 20 s all-out cycle sprints with intervening 20-s rest periods. ]]></content:encoded>
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