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    <item>
      <title>Modellierung des Verhältnisses zwischen Geschwindigkeit und Zeit zur Ermüdung im Rudern</title>
      <pubDate>Wed, 01 Jan 2003 02:11:03 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4008290</link>
      <guid>https://sponet.de/sponet/Record/4008290</guid>
      <author>Hill, D. W.</author>
      <author>Alain, C.</author>
      <author>Kennedy, M. D.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ermüdung</dc:subject>
      <dc:subject>Geschwindigkeit</dc:subject>
      <dc:subject>Modellierung</dc:subject>
      <dc:subject>Rudern</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Hill, D. W.</dc:creator>
      <dc:creator>Alain, C.</dc:creator>
      <dc:creator>Kennedy, M. D.</dc:creator>
      <content:encoded><![CDATA[INTRODUCTION: Several mathematical models describe the relationship between velocity and time to fatigue.
PURPOSE: The purposes of this study were to evaluate different critical velocity (V(critical)) models applied to rowing ergometry and to investigate prediction of performance time in a 2000-m race based on results from shorter trials.
METHODS: Sixteen men performed seven rowing ergometer tests. Velocity and time to fatigue data from the 200-m (approximately 0.5 min) to 1200-m (approximately 3 min) trials and from the 200-m to 2000-m (approximately 6.5 min) trials were fit to a two-parameter hyperbolic model, a three-parameter hyperbolic model, and a three-parameter exponential model.
RESULTS: Including data from the 2000-m trial generally resulted in higher R2 and smaller SEE. V(critical) from the three versions of the two-parameter model were 4.71 +/- 0.28 m x s(-1), 4.80 +/- 0.27 m x s(-1), and 5.04 +/- 0.24 m x s(-1) (P < 0.001). The two three-parameter models had high R2 (0.991 and 0.990, respectively) and generated parameter estimates that appeared reasonable. Time for a 2000-m race was predicted better using the two-parameter model (r > 0.974) than using the three-parameter models (r = 0.820-0.870). CONCLUSION: It is necessary to include the relatively long 2000-m predicting trial to describe accurately the velocity-time relationship in rowing. The two-parameter model may be useful in predicting time for a 2000-m race but is not otherwise appropriate for modeling when predicting trials of <1 min duration are included. Choice of model and duration of trials must be considered when using mathematical modeling to derive V(critical) and other parameters in rowing.]]></content:encoded>
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    <item>
      <title>Modellierung des Verhältnisses zwischen Geschwindigkeit und Zeit zur Ermüdung im Rudern</title>
      <pubDate>Wed, 01 Jan 2003 02:11:03 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3036820</link>
      <guid>https://sponet.de/sponet/Record/3036820</guid>
      <author>Hill, D. W.</author>
      <author>Alain, C.</author>
      <author>Kennedy, M. D.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Rudern</dc:subject>
      <dc:subject>Ermüdung</dc:subject>
      <dc:subject>Relation</dc:subject>
      <dc:subject>Geschwindigkeit</dc:subject>
      <dc:subject>Zeit</dc:subject>
      <dc:subject>Modellierung</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Hill, D. W.</dc:creator>
      <dc:creator>Alain, C.</dc:creator>
      <dc:creator>Kennedy, M. D.</dc:creator>
      <content:encoded><![CDATA[INTRODUCTION: Several mathematical models describe the relationship between velocity and time to fatigue.
PURPOSE: The purposes of this study were to evaluate different critical velocity (V(critical)) models applied to rowing ergometry and to investigate prediction of performance time in a 2000-m race based on results from shorter trials.
METHODS: Sixteen men performed seven rowing ergometer tests. Velocity and time to fatigue data from the 200-m (approximately 0.5 min) to 1200-m (approximately 3 min) trials and from the 200-m to 2000-m (approximately 6.5 min) trials were fit to a two-parameter hyperbolic model, a three-parameter hyperbolic model, and a three-parameter exponential model.
RESULTS: Including data from the 2000-m trial generally resulted in higher R2 and smaller SEE. V(critical) from the three versions of the two-parameter model were 4.71 +/- 0.28 m x s(-1), 4.80 +/- 0.27 m x s(-1), and 5.04 +/- 0.24 m x s(-1) (P < 0.001). The two three-parameter models had high R2 (0.991 and 0.990, respectively) and generated parameter estimates that appeared reasonable. Time for a 2000-m race was predicted better using the two-parameter model (r > 0.974) than using the three-parameter models (r = 0.820-0.870). CONCLUSION: It is necessary to include the relatively long 2000-m predicting trial to describe accurately the velocity-time relationship in rowing. The two-parameter model may be useful in predicting time for a 2000-m race but is not otherwise appropriate for modeling when predicting trials of <1 min duration are included. Choice of model and duration of trials must be considered when using mathematical modeling to derive V(critical) and other parameters in rowing.]]></content:encoded>
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