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Intracyclic Variation of Force and Swimming Performance
International Journal of Sports Physiology and Performance
|December 29, 2017
Summary
Assessing intracyclic force variation (dF) in front-crawl swimming is a promising new metric. Higher dF correlates with increased velocity variation (dv) and decreased swimming performance, offering a novel evaluation approach.
Area of Science:
- Sports Science
- Biomechanics
- Swimming Performance Analysis
Background:
- Front-crawl swimming relies on alternating upper limb movements for continuous force application.
- Intracyclic velocity variation (dv) is a key metric for evaluating swimmer efficiency.
- Reducing dv is crucial for optimizing swimming performance.
Purpose of the Study:
- To assess intracyclic force variation (dF) as a performance metric.
- To analyze the relationship between dF, dv, and overall swimming performance.
Main Methods:
- 22 high-level male swimmers participated in maximal-effort 50-m time trials and tethered swimming tests.
- Instantaneous swimming velocity was measured using a speedometer.
- Arm forces were recorded using a strain-gauge system.
Main Results:
- Intracyclic force variation (dF) was significantly higher than velocity variation (dv).
- Swimming velocity showed a strong negative correlation with dF (r=-.826) and moderate with dv (r=-.734).
- Multiple regression analysis incorporating dF explained 83% of free-swimming performance.
Conclusions:
- Intracyclic force variation (dF) is a valuable new parameter for swimmer evaluation.
- Higher dF is associated with increased dv and reduced swimming performance.
- dF assessment offers a promising avenue for optimizing training and technique.
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