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Classification methods can identify external constrains in swimming.

Rafaila Grigoriou1, Thomas Nikodelis2, Dimitris Kugiumtzis1

  • 1Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Greece.

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Researchers can identify swimmers using fins by analyzing their technique. Specific kinematic features reliably distinguish between fin use and non-use in butterfly swimming.

Keywords:
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Area of Science:

  • Biomechanics
  • Sports Science
  • Motor Control

Background:

  • Swimming fins are commonly used to enhance propulsion.
  • The influence of fins on a swimmer's technique is not fully understood.
  • Objective analysis of swimming technique can reveal subtle changes.

Purpose of the Study:

  • To determine if fin use is detectable through analysis of swimming technique.
  • To identify specific kinematic features indicative of fin influence during swimming.

Main Methods:

  • Kinematic data were collected using movement sensors on swimmers.
  • Features were extracted from butterfly swimming technique data.
  • Dimensionality reduction, feature selection, and classification algorithms were applied.

Main Results:

  • Classification accuracy for distinguishing between long, short, and no fins reached up to 70%.
  • A simplified two-class classification (long fins vs. no fins) achieved 78% accuracy.
  • Statistical significance confirmed that fin use measurably alters swimming technique.

Conclusions:

  • The use of swimming fins significantly influences and is recognizable in a swimmer's technique.
  • Selected kinematic features effectively differentiate between finned and non-finned swimming.
  • These findings are dependent on the specific swimming type analyzed.