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    <item>
      <title>Einfluss von Schwimmtapering auf die Kontraktionseigenschaften des Gesamtmuskels und die Einzelmuskelfasern</title>
      <pubDate>Mon, 01 Jan 2001 03:43:54 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4005298</link>
      <guid>https://sponet.de/sponet/Record/4005298</guid>
      <author>Trappe, S.</author>
      <author>Costill, D.</author>
      <author>Thomas, R.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Tapering</dc:subject>
      <dc:subject>Schwimmen</dc:subject>
      <dc:subject>Muskel</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Kraft</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Trappe, S.</dc:creator>
      <dc:creator>Costill, D.</dc:creator>
      <dc:creator>Thomas, R.</dc:creator>
      <content:encoded><![CDATA[Purpose: To examine the changes in whole muscle function and single cell contractile properties of Type I and II muscle fibers from the deltoid muscle of highly trained swimmers before and after a 21-d reduction in training volume (taper). Methods: Six college male swimmers (age, 20 +/- 1 yr; height, 187 +/- 2 cm, weight, 79 +/- 3 kg, fat, 7 +/- 1%) who had been, on average, swimming 6200 m.d-1 for 5 months before the taper participated in this investigation. Results: Whole muscle power increased (P < 0.05) 17% and 13% on the swim bench and swim power tests, respectively. Swim times improved by 4% (range: 3.0-4.7%; P < 0.05). There was no change in Type I fiber diameter, whereas Type IIa fibers were 11% larger (P < 0.05) after taper. Peak force (Po) of the Type I fibers was unaffected by the taper but increased (P < 0.05) from 0.63 +/- 0.02 to 0.82 +/- 0.05 mN in the IIa fibers. However, the specific force (Po/CSA) of the IIa fibers was unchanged. Shortening velocity (Vo) was 32% and 67% faster (P < 0.05) in the Type I and IIa fibers, respectively. Although Type I fiber power was unaltered, the IIa fibers increased 2.5-fold from 24.6 +/- 2.8 to 56.2 +/- 3.9 ?N.FL.s-1. When power was normalized for cell size, the power was still elevated twofold. Conclusions: These data suggest that tapering induces alterations in the contractile properties of single muscle fibers. Further, it appears that the Type IIa fibers are more affected than the Type I fibers by the taper. The increased size, strength, velocity, and power of the IIa fibers may be responsible for the improvements in whole muscle strength and power after the taper. ]]></content:encoded>
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    <item>
      <title>Einfluss von Schwimmtapering auf die Kontraktionseigenschaften des Gesamtmuskels und der einzelnen Muskelfaser</title>
      <pubDate>Mon, 01 Jan 2001 03:43:54 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032491</link>
      <guid>https://sponet.de/sponet/Record/3032491</guid>
      <author>Trappe, S.</author>
      <author>Costill, D.</author>
      <author>Thomas, R.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Schwimmen</dc:subject>
      <dc:subject>Tapering</dc:subject>
      <dc:subject>Muskel</dc:subject>
      <dc:subject>Kraft</dc:subject>
      <dc:subject>Struktur</dc:subject>
      <dc:subject>Leistung</dc:subject>
      <dc:subject>Faser</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Trappe, S.</dc:creator>
      <dc:creator>Costill, D.</dc:creator>
      <dc:creator>Thomas, R.</dc:creator>
      <content:encoded><![CDATA[Zielstellung: 
Untersuchung der Veränderungen in der gesamten Muskelfunktion und in den Kontraktionseigenschaften der Muskelfasern Typ I und II des Deltamuskels von 6 hochtrainierten Schwimmern vor und nach 21 Tagen Trainingsumfangsreduzierung (Tapering).
Ergebnis:
Tapering bewirkt Veränderungen in den Kontraktionseigenschaften der einzelnen Muskelfaser. Muskelfasern Typ II werden durch Tapering mehr beinflusst alsMuskelfasern Typ I. Die erhöhte Größe, Kraft, Geschwindkeit  und Leistung der Fasern Typ II können für die Verbesserung der Gesamtmuskelkraft und -leistung nach dem Tapering verantwortlich sein.]]></content:encoded>
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