Validity and Reliability of 2D Video Analysis for Swimming Kick Start Kinematics

Area of Science:

• Sports Biomechanics
• Swimming Performance Analysis
• Motion Analysis Software Validation

Background:

• Objective evaluation of swimming starts is crucial for improving sprint performance.
• Traditional visual assessments lack precision, necessitating advanced biomechanical tools.
• IQ LAB software offers integrated, accessible video-based motion analysis for applied settings.

Purpose of the Study:

• To validate the IQ LAB software (Version 250319) for 2D kinematic analysis of the swimming kick start.
• To assess the concurrent validity and reliability of IQ LAB against a gold standard (Dartfish).
• To establish IQ LAB as a practical tool for coaches and researchers in swimming.

Main Methods:

• Concurrent validity was assessed by comparing IQ LAB outputs with Dartfish (ProSuite 4.0) for 13 competitive male swimmers.
• Intrarater reliability was evaluated using a 7-day test-retest design.
• Interrater reliability was determined by two independent raters analyzing the same video data using IQ LAB.

Main Results:

• IQ LAB and Dartfish kinematic parameters showed strong agreement (Pearson r ≥ 0.95).
• Intrarater and interrater reliability were excellent (ICC ≥ 0.94).
• Test-retest reliability demonstrated excellent reproducibility (ICC ≥ 0.93).

Conclusions:

• IQ LAB software is a valid and reliable tool for 2D kinematic assessment of swimming kick starts.
• The software provides a practical and accessible solution for biomechanical analysis in swimming.
• This study introduces a novel, validated software for immediate swimming start analysis.