Differences in swimming smoothness between elite and non-elite swimmers

Area of Science:

• Sports Science
• Biomechanics
• Swimming Performance Analysis

Background:

• Swimming performance is influenced by technique and efficiency.
• Objective measures are needed to quantify swimming technique differences.
• Jerk cost (JC) is a potential indicator of movement smoothness and efficiency.

Purpose of the Study:

• To determine if jerk cost (JC) can differentiate between elite and non-elite swimmers.
• To assess the relationship between JC and swimming speed in front-crawl sprints.
• To evaluate JC as a practical index for swimming technique analysis.

Main Methods:

• Nine elite and nine non-elite swimmers performed a 50-m front-crawl sprint.
• A 3D accelerometer was used to record acceleration data.
• Lap times and jerk cost (JC) were calculated and compared between groups.

Main Results:

• Elite swimmers achieved significantly faster lap times than non-elite swimmers (p < 0.001).
• Elite swimmers exhibited significantly lower jerk cost (JC) compared to non-elite swimmers (p = 0.005).
• JC explained 32.9% of the variation in lap time for elite swimmers.

Conclusions:

• Jerk cost (JC) can successfully discriminate between elite and non-elite swimmers.
• Lower JC is associated with higher swimming performance and smoother technique.
• JC offers a practical and valuable index for assessing swimming technique in training.