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The Effect of the Swimmer's Trunk Oscillation on Dolphin Kick Performance Using a Computational Method with
Zhiya Chen1, Tianzeng Li1, Jin Yang2
1School of Industrial Design and Ceramic Art, Foshan University, Foshan 528011, China.
Summary
Increasing trunk oscillation amplitude enhances swimming velocity in dolphin kicks. This involves targeted strength training for key joints during both upkick and downkick phases for optimal performance.
Area of Science:
- Biomechanics
- Fluid Dynamics
- Sports Science
Background:
- Optimizing competitive swimming techniques is crucial for performance.
- The dolphin kick is a fundamental swimming stroke requiring precise body movements.
Purpose of the Study:
- To investigate the effect of trunk oscillation on dolphin kick propulsion.
- To optimize competitive swimming movement through numerical simulation.
Main Methods:
- Multi-body motion numerical simulation using 3D incompressible Navier−Stokes equations.
- Renormalization group k-ε turbulence model and Volume of Fluid method were employed.
- Simulation results were validated against experimental data and prior studies.
Main Results:
- A significant positive correlation (r=0.986, p<0.05) was found between trunk oscillation amplitude and mean swimming velocity.
- Increased swimming velocity correlated with significant changes in joint moments (e.g., +24.7% ankle positive moment).
- The study analyzed the relationship between trunk oscillation and vortex dynamics.
Conclusions:
- Swimmers should increase trunk oscillation amplitude to enhance dolphin kick velocity.
- Strength training for ankles, knees, and upper waist during upkick is recommended.
- Additional strength training for ankles, knees, hips, and upper waist during downkick is advised.
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