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Arm coordination and performance level in the 400-m front crawl.

Christophe Schnitzler¹, Ludovic Seifert, Didier Chollet

¹Department of Sport Sciences, University of Strasbourg, France. cschnitzler@ac-strasbg.fr

Research Quarterly for Exercise and Sport

|April 6, 2011

Summary

Expert swimmers optimize front crawl performance using efficient coordination and longer stroke lengths. This study reveals key biomechanical differences in maximal 400m swimming, highlighting the importance of the Index of Coordination (IdC).

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Area of Science:

Sports Science
Biomechanics
Swimming Performance Analysis

Background:

Understanding biomechanical factors differentiating elite swimmers from recreational athletes is crucial for performance enhancement.
The Index of Coordination (IdC) and propulsive phase durations are key metrics in swimming analysis.

Purpose of the Study:

To investigate if the Index of Coordination (IdC) and propulsive phase durations can distinguish performance levels in maximal 400m front crawl swimming.
To analyze stroke and coordination parameters in relation to swimming speed and efficiency.

Main Methods:

Video analysis of 16 male swimmers (experts vs. recreational) during a maximal 400m front crawl.
Measurement of stroke parameters (speed, length, rate) and coordination (IdC) every 50m.
Statistical comparison of parameters between expert and recreational groups.

Main Results:

Both stroke and coordination parameters differentiated performance levels.
Experts exhibited significantly higher swimming speed and stroke length.
Experts demonstrated lower relative propulsive phase duration and IdC values (p < .05).

Conclusions:

Catch-up coordination, combined with greater stroke length, appears to be an efficient strategy for optimal drag/propulsion adaptation in middle-distance swimming.
Coordination parameters remained consistent within groups throughout the 400m trial.
Findings offer new insights into biomechanical adaptations for middle-distance swimming events.