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      <title>Kohlenhydrataufnahme vor Belastung: Einfluß des glykämischen Index auf die Ausdauerleistung</title>
      <pubDate>Thu, 01 Jan 1998 07:51:47 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4001693</link>
      <guid>https://sponet.de/sponet/Record/4001693</guid>
      <author>Sparks, M. J.</author>
      <author>Selig, S. S.</author>
      <author>Febbraio, M. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Belastung</dc:subject>
      <dc:subject>Ernährung</dc:subject>
      <dc:subject>Kohlenhydrat</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Sparks, M. J.</dc:creator>
      <dc:creator>Selig, S. S.</dc:creator>
      <dc:creator>Febbraio, M. A.</dc:creator>
      <content:encoded><![CDATA[PURPOSE: This study aimed to examine the effect of glycemic index of pre-exercise carbohydrate (CHO) ingestion on exercise metabolism and performance.
METHODS: Eight endurance trained men ingested a high glycemic index (HGI), low glycemic index (LGI), or a placebo (CON) meal 45 min before exercise and then cycled for 50 min at 67% VO2max. Subjects subsequently performed a 15-min self-paced performance ride in which total work (kJ) was recorded. 
RESULTS: Plasma glucose concentrations were higher (P < 0.01) after ingestion in HGI compared with LGI and CON (7.53 +/- 0.64 vs 5.55 +/- 0.21 and 4.65 +/- 0.14 mmol.L-1 for HGI, LGI, and CON, respectively, 30 min postprandial; mean +/- SE) but declined at the onset of exercise and were lower (P < 0.01) compared with LGI and CON (4.03 +/- 0.31 vs 4.64 +/- 0.24 and 5.09 +/- 0.16 mmol.L-1 for HGI, LGI, and CON respectively; mean +/- SE) at 10 min of exercise. Plasma glucose remained depressed (P < 0.01) until 30 min into exercise in HGI compared with other trials. Plasma insulin concentrations were higher (P < 0.01) following ingestion during rest and exercise in HGI compared with LGI and CON. Plasma FFA concentrations were lower (P < 0.05) following ingestion in HGI and LGI compared with CON and higher (P < 0.05) in LGI compared with HGI at the start and end of exercise. RER and CHO oxidation was higher (P < 0.01) in HGI compared with LGI and CON during submaximal exercise. There were no differences in work output during the performance cycle.
CONCLUSIONS: These data indicate that pre-exercise CHO feedings with varying glycemic indexes do not affect exercise performance following short term submaximal exercise despite alterations in metabolism.]]></content:encoded>
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    <item>
      <title>Kohlenhydrataufnahme vor Belastung: Einfluß des glykämischen Index auf die Ausdauerleistung</title>
      <pubDate>Thu, 01 Jan 1998 07:51:47 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3028502</link>
      <guid>https://sponet.de/sponet/Record/3028502</guid>
      <author>Sparks, M. J.</author>
      <author>Selig, S. S.</author>
      <author>Febbraio, M. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ernährung</dc:subject>
      <dc:subject>Kohlenhydrat</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Triathlon</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Sparks, M. J.</dc:creator>
      <dc:creator>Selig, S. S.</dc:creator>
      <dc:creator>Febbraio, M. A.</dc:creator>
      <content:encoded><![CDATA[8 männliche Triathleten (22.7+/-1.4 Jahre, VO2max = 67.9+/-2.8 l/min/kg) nahmen 45 min vor Belastung eine Mahlzeit mit hohem glykämischen Index (HGI), niedrigem glykämischen Index (LGI) oder ein Placebo (CON) auf und fuhren dann 50 min Rad bei 67% ihrer VO2max. Danach absolvierten die Probanden einen 15-minütigen Leistungstest mit selbtsgewähltem Tempo, bei dem die Gesamtarbeit (kJ) kontrolliert wurde.
Es wurde festgestellt, daß eine CHO-Aufnahme mit verschiedenen glykämischen Indexen vor Belastung keinen Einfluß auf die Leistung nach kurzzeitiger submaximaler Belastung trotz der Stoffwechselveränderungen aufweist.]]></content:encoded>
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