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    <title>Results for Versions - 3032193</title>
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    <item>
      <title>Physiologische Determinanten der Ausdauerleistung</title>
      <pubDate>Fri, 01 Jan 1999 16:12:58 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4004777</link>
      <guid>https://sponet.de/sponet/Record/4004777</guid>
      <author>Coyle, E. F.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Sportphysiologie</dc:subject>
      <dc:subject>Theorie</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Coyle, E. F.</dc:creator>
      <content:encoded><![CDATA[Performance in endurance events is typically evaluated by the power or velocity that can be maintained for durations of 30 min. to four hours. The two main by-products of intense and prolonged oxidative metabolism that can limit performance are the accumulation of hydrogen ion (i.e. lactic acidosis) and heat (i.e. hyperthermia). A model for endurance performance is presented that revolves around identification of the lactate threshold velocity which is presented as a function of numerous morphological components as well as gross mechanical efficiency. When cycling at 80 RPM, gross mechanical efficiency is positively related to Type I muscle fiber composition, which has great potential to improve endurance performance. Endurance performance can also be influenced by altering the availability of oxygen and blood glucose during exercise. The latter need forms the basis for ingesting carbohydrate at 30-60 grams per hour during exercise. In laboratory simulations of performance, athletes fatigue due to hyperthermia when esophageal is approximately 40 degrees C, in association with near maximal heart rate and perceived exertion. It is likely that the central nervous system is involved in the aetiology of fatigue from hyperthermia. Dehydration during exercise promotes hyperthermia by reducing skin blood flow, sweating rate and thus heat dissipation. The combination of dehydration and hyperthermia during exercise causes large reductions in cardiac output and blood flow to the exercising musculature, and thus has a large potential to impair endurance performance. Endurance performance is optimized when training is aimed specifically at developing individual components of the model presented and nutritional supplementation prevents hypoglycemia and attenuates dehydration and hyperthermia. Indeed, the challenge at the transition to a new millennium is to synergistically integrate these physiological factors in training and competition.]]></content:encoded>
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      <title>Physiologische Determinanten der Ausdauerleistung</title>
      <pubDate>Fri, 01 Jan 1999 16:12:58 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032193</link>
      <guid>https://sponet.de/sponet/Record/3032193</guid>
      <author>Coyle, E. F.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Theorie</dc:subject>
      <dc:subject>Sportphysiologie</dc:subject>
      <dc:subject>Thermoregulation</dc:subject>
      <dc:subject>Wasserhaushalt</dc:subject>
      <dc:subject>Ernährung</dc:subject>
      <dc:subject>aerob-anaerobe Schwelle</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Coyle, E. F.</dc:creator>
      <content:encoded><![CDATA[Es wird ein Modell der Ausdauerleistung vorgestellt, das die Bestimmung der Laktatschwellengeschwindigkeit in den Mittelpunkt stellt, die als eine Funktion von zahlreichen morphologischen Komponenten sowie der mechanischen Gesamteffizienz dargestellt wird. Beim Radfahren mit einer Tretfrequenz pro Minute von 80 ist die mechanische Effizienz positiv zum Muskelfaser Typ 1 bezogen, der ein großes Potential zur Verbesserung der Ausdauerleistung besitzt. Die Ausdauerleistungs kann auch durch Veränderung der Verfügbarkeit von Sauerstoff und Blutglykose während Belastung beeinflusst werden.  Dehydration während Belastung fördert eine Hyperthermie durch Verminderung der Hautdurchblutung, der Schweißhöhe und somit der Wärmeabgabe.Die Verbindung von Dehydration und Hyperthermie während Belastung verursacht große Einschränkungen im Herzminutenvolumen und in der Durchblutung der belasteten Muskulatur und stellt damit ein großes Potential zur Beeinträchtigung der Ausdauerleistung dar.]]></content:encoded>
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