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    <item>
      <title>Einfluss der Umgebungstemperatur auf Plasma-Stickstoff und Laktatakkumulation während submaximalem Dauerlaufens mit selbstgewähltem Tempo</title>
      <pubDate>Mon, 01 Jan 2001 20:53:47 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3033902</link>
      <guid>https://sponet.de/sponet/Record/3033902</guid>
      <author>Marino, F. E.</author>
      <author>Mbambo, Z.</author>
      <author>Kortekaas, E.</author>
      <author>Wilson, G.</author>
      <author>Lambert, M. I.</author>
      <author>Noakes, T. D.</author>
      <author>Dennis, S. C.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Langstreckenlauf</dc:subject>
      <dc:subject>Temperatur</dc:subject>
      <dc:subject>Stickstoff</dc:subject>
      <dc:subject>Laktat</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Marino, F. E.</dc:creator>
      <dc:creator>Mbambo, Z.</dc:creator>
      <dc:creator>Kortekaas, E.</dc:creator>
      <dc:creator>Wilson, G.</dc:creator>
      <dc:creator>Lambert, M. I.</dc:creator>
      <dc:creator>Noakes, T. D.</dc:creator>
      <dc:creator>Dennis, S. C.</dc:creator>
      <content:encoded><![CDATA[Es wurden die Wirkungen von Hitzebelastung auf die Akkumulation von Stickstoff, Laktat und Urat im Plama während Dauerlaufens untersucht. 9 hochtrainierte Ausdauerläufer absolvierten Test unter kalten (15°C) und heißen (35°C), relative Luftfeuchtigkeit 60%, Bedingungen. Sie liefen auf einem Laufband bei 70% der maximalen Laufgeschwindigkeit 30 min (submaximal), danach einen 8-km-Lauf mit selbstgewähltem Tempo.
Ergebnisse:
- 5 Probanden absolvierten den 8-km-Lauf unter Hitze nicht. Der Rest erhöhte die Zeit von 27,3 min unter kalten Bedingungen auf 31,3 min unter heißen Bedingungen.
- Die Rektaltemperatur erhöhte sich am Ende des 8-km-Laufs von 38,6 bei Kälte auf 39,2°C bei Hitze.
- Die Unterschiede im Laktat am Ende des submaximalen Laufens waren nicht signifikant, jedoch die beim 8-km-Lauf (6,0 mmol/l bei Kälte auf 3,1 mmol/l bei Hitze).
- Anstieg von Plasma-Stickstoff am Ende der submaximalen Läufe unter beiden Bedingungen und am Ende des 8-km-Laufes unter heißen Bedingungen, nicht unter kalten.
- Anstieg von Plasmaurat am Ende beider Tests unter beiden Bedingungen.]]></content:encoded>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Einfluss der Umgebungstemperatur auf Plasma-Stickstoff und Laktatakkumulation während submaximalen Dauerlaufens mit selbstgewähltem Tempo</title>
      <pubDate>Mon, 01 Jan 2001 20:53:47 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4006472</link>
      <guid>https://sponet.de/sponet/Record/4006472</guid>
      <author>Marino, F. E.</author>
      <author>Mbambo, Z.</author>
      <author>Kortekaas, E.</author>
      <author>Wilson, G.</author>
      <author>Lambert, M. I.</author>
      <author>Noakes, T. D.</author>
      <author>Dennis, S. C.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Laktat</dc:subject>
      <dc:subject>Langstreckenlauf</dc:subject>
      <dc:subject>Stickstoff</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:subject>Temperatur</dc:subject>
      <dc:subject>Thermoregulation</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Marino, F. E.</dc:creator>
      <dc:creator>Mbambo, Z.</dc:creator>
      <dc:creator>Kortekaas, E.</dc:creator>
      <dc:creator>Wilson, G.</dc:creator>
      <dc:creator>Lambert, M. I.</dc:creator>
      <dc:creator>Noakes, T. D.</dc:creator>
      <dc:creator>Dennis, S. C.</dc:creator>
      <content:encoded><![CDATA[This study examined the effects of heat stress on the accumulation of plasma ammonia, lactate, and urate during prolonged running. Nine highly trained endurance runners completed two running trials in a counterbalanced fashion in cool (15°C) and in hot (35°C) humid (60% relative humidity) conditions. Subjects ran on a motorised treadmill at 70% of peak treadmill running speed for 30 min (submaximal) followed by a self-paced 8-km performance run. Blood was drawn at pre-exercise, end-submaximal and end-performance run and analysed for plasma ammonia, lactate, and urate. Four subjects failed to complete the performance run in the heat and the performance times for the rest of the subjects was increased from 27.3 (0.6) min in cool conditions to 31.3 (1.2) min in hot conditions (P<0.05). The end-performance rectal temperature was 38.6 (0.1) and 39.2 (0.1)°C (P<0.05) in cool and hot conditions, respectively. Differences in plasma lactate at the end of submaximal running were not significant. However, at the end of performance runs lactate was 6.0 (0.9) mmol·l-1 in cool and 3.1 (0.5) mmol·l-1 in hot conditions, values that were significantly different (P<0.05). Plasma ammonia increased from pre-exercise to 59 µmol·l-1 at the end-submaximal runs for both coditions and further at the end of performance runs to 108.5 (11) µmol·l-1 (P<0.05) in hot but not in cool conditions. Plasma urate increased from pre-exercise to 311.2 (25.9) µmol·l-1 at end-submaximal runs and to 320.4µmol·l-1 at end-performance runs in hot and cool environments. The findings that plasma urate accumulation was similar at the completion of running in both conditions, while ammonia was significantly augmented in hot conditions compared with cool, suggest that ammonia accumulation during heat stress exercise might be derived from sources other than purine catabolism.]]></content:encoded>
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