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    <title>Ergebnis für Versionen - 4002739</title>
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    <item>
      <title>Einfluss verschiedener Rennpositionen auf den Stoffwechsel bei Eliteradfahrern</title>
      <pubDate>Wed, 01 Jan 1997 22:32:33 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4002739</link>
      <guid>https://sponet.de/sponet/Record/4002739</guid>
      <author>Gnehm, P.</author>
      <author>Reichenbach, S.</author>
      <author>Altpeter, E.</author>
      <author>Widmer, H.</author>
      <author>Hoppeler, H.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:subject>Technik</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Gnehm, P.</dc:creator>
      <dc:creator>Reichenbach, S.</dc:creator>
      <dc:creator>Altpeter, E.</dc:creator>
      <dc:creator>Widmer, H.</dc:creator>
      <dc:creator>Hoppeler, H.</dc:creator>
      <content:encoded><![CDATA[Spectacular improvements of the 1-hour world record in cycling in the last four years have highlighted the importance of aerodynamics in modern bicycle racing. The metabolic consequences of the low-crouched aero-positions necessary to reduce air drag were investigated. 
Male bicycle racers (N = 14) were tested for oxygen consumption and heart rate at 70% VO2max in three different riding positions during a single test run. Ss rode racing bicycles on a wind-braked roller; following a randomized sequence of positions: 
   1.upright cycling with a cadence of 90 rpm; 
   2.hands on drops at 90 rpm; and 
   3.hands on clip-on aero-handlebars at 90 rpm. 
VO2 and heart rate values in the clip-on aero-handlebars condition were significantly higher than in the upright cycling position.
It was concluded that riding a bicycle in an extreme aero-position increases the metabolic cost of cycling when wind resistance is not taken into account. However, when the mechanical power losses are compared with the expected aerodynamic power savings, it appears that aerodynamic advantages by far outweigh their metabolic cost.
Implication: The metabolic cost of cycling in an aerodynamic position is greater than performing in a comfortable upright position. However, the mechanical power gains far outweigh the increased difficulty.
This study is an example that demonstrates a new and more difficult technique reaping far greater gains for performance than the cost of performing it.]]></content:encoded>
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    <item>
      <title>Einfluß verschiedener Körperhaltungen auf den Stoffwechselaufwand von Eliteradsportlern</title>
      <pubDate>Wed, 01 Jan 1997 22:32:33 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3026876</link>
      <guid>https://sponet.de/sponet/Record/3026876</guid>
      <author>Gnehm, P.</author>
      <author>Reichenbach, St.</author>
      <author>Altpeter, E.</author>
      <author>Widmer, H.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Sportphysiologie</dc:subject>
      <dc:subject>Radsport</dc:subject>
      <dc:subject>Haltung</dc:subject>
      <dc:subject>Körper</dc:subject>
      <dc:subject>Aerodynamik</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Gnehm, P.</dc:creator>
      <dc:creator>Reichenbach, St.</dc:creator>
      <dc:creator>Altpeter, E.</dc:creator>
      <dc:creator>Widmer, H.</dc:creator>
      <content:encoded><![CDATA[Es wurden die Stoffwechselwirkungen bei geduckten Radfahrhaltungen zur Reduzierung des Luftwiderstandes untersucht. Von 14 männlichen Eliteradsportler (24+/-1.0 Jahre, VO2max 69.4+/-0.5 ml/kg/min) wurden VO2 und HF bei 70% ihrer individuellen VO2max in drei verschiedenen Körperhaltungen während eines Einzeltestrennens überprüft. Die Probanden benutzten ihre Rennräder auf einem luftgebremsten Roller. Die Reihenfolge der drei nachfolgend genannten Haltungen war zufällig: 1. Aufrechtes Radfahren (UP), Tretfrequenz 90, 2. Traditionelle Zeitfahrhaltung (DP), Tretfrequenz 90, 3. Aerodynamische Haltung (AP), Tretfrequenz 90. 
Ergebnisse: Die VO2- und HF-Werte waren bei AP signifikant um 1,5 ml/kg/min und 5 Schläge/min höher als bein UP. Es wird geschlußfolgert, daß eine extreme aerodynamische Haltung den Stoffwechselverbrauch erhöht bei Nichtbeachten des Luftwiderstandes. ]]></content:encoded>
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