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Does the flutter kick increase hand propulsion in front crawl swimming?

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Area of Science:

  • Sports Science
  • Biomechanics
  • Swimming Performance

Background:

  • The front crawl stroke is a primary swimming technique.
  • Understanding the contribution of different body movements, like the flutter kick and arm stroke, to propulsion is crucial for optimizing swimming performance.
  • Previous research has explored various aspects of swimming biomechanics, but the specific impact of the flutter kick on hand propulsion requires further clarification.

Purpose of the Study:

  • To investigate the effect of the flutter kick on propulsive force generation during the front crawl stroke.
  • To compare swimming performance parameters between a whole-body condition (including flutter kick) and an arm-only condition.

Main Methods:

  • Eight male swimmers completed 20m front crawl trials under two conditions: Whole Condition (with flutter kick) and Arm Condition (without flutter kick).
  • Trials were conducted at 70%, 80%, and 90% of maximum effort (T100%) to match stroke frequencies.
  • Underwater 3D motion analysis and hand pressure measurements were used to calculate swimming velocity, stroke frequency, stroke length, hand speed, and hand propulsion.

Main Results:

  • A significant main effect of condition was observed for swimming velocity and stroke length, which were higher (16.9-18.5%) and longer (17.3-19.5%) respectively in the Whole Condition compared to the Arm Condition.
  • No significant interaction was found between the condition (Whole vs. Arm) and intensity (70-90% T100%) for any measured variable.
  • Crucially, no difference in hand propulsion was detected between the two conditions, indicating the flutter kick does not influence hand propulsion.

Conclusions:

  • The flutter kick significantly enhances overall swimming velocity and stroke length in front crawl.
  • Despite improving overall performance metrics, the flutter kick does not directly increase the propulsive force generated by the hands.
  • These findings suggest that the flutter kick contributes to swimming efficiency through mechanisms other than direct augmentation of hand propulsion.