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Determining propulsive force in front crawl swimming: a comparison of two methods
M A Berger1, A P Hollander, G de Groot
1Institute of Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit Amsterdam, The Netherlands.
Journal of Sports Sciences
|March 9, 1999
Summary
Researchers evaluated front crawl arm swimming forces using 3D kinematic analysis and compared them to drag forces. Both methods yielded comparable results, validating the kinematic analysis for calculating realistic propulsive forces in swimming.
Area of Science:
- Biomechanics
- Fluid Dynamics in Sports
Background:
- Understanding propulsive forces is crucial for optimizing swimming technique and performance.
- Previous methods for measuring swimming forces have limitations.
Purpose of the Study:
- To evaluate the accuracy of propulsive forces derived from 3D kinematic analysis in front crawl arm swimming.
- To compare these calculated forces with mean drag forces measured independently.
Main Methods:
- Three-dimensional kinematic analysis was employed to calculate propulsive forces.
- Lift and drag coefficients were obtained from fluid laboratory experiments.
- Calculated propulsive forces were compared with mean drag forces measured using a Measuring Active Drag (MAD) system.
Main Results:
- The mean propulsive forces calculated via 3D kinematic analysis were comparable to mean drag forces.
- The difference between the two measurement methods was minimal, averaging only 5% (2 N).
- Propulsive force calculation sensitivity was higher to hand velocity estimation point than hand orientation.
Conclusions:
- Three-dimensional kinematic analysis provides realistic estimations of propulsive forces in front crawl arm swimming.
- This kinematic approach is a valid tool for analyzing swimming propulsion.
- Accurate estimation of hand velocity is key for precise propulsive force calculations.