Introducing the Novel Deceleration Threshold Method: Comparative Reliability to Previous Sprint Deceleration Analysis...

Area of Science:

• Sports Science
• Biomechanics
• Performance Analysis

Background:

• Deceleration assessments are crucial for profiling team sport athletes' ability to manage mechanical forces.
• Current methods using low sampling technology limit the reliability of defining deceleration start points.

Purpose of the Study:

• To compare the intra- and inter-day reliability of three deceleration assessment analysis methods.
• To identify the most reliable method for analyzing sprint deceleration performance.

Main Methods:

• Compared set distance, peak velocity, and deceleration threshold methods using a motorized linear encoder.
• Ten male and 10 female athletes performed 30m sprint deceleration trials over two days.
• Analyzed key metrics like distance-to-stop (DTS), time-to-stop (TTS), and average deceleration (DECave) using customized code.

Main Results:

• The deceleration threshold method, using the average of the best two trials, showed excellent inter-day reliability.
• Key metrics demonstrated high reliability: TTS (ICC=0.93), DTS (ICC=0.97), and DECave (ICC=0.92).
• This method improved reliability and sensitivity for detecting meaningful changes in performance.

Conclusions:

• The deceleration threshold method, combined with averaging the best two trials, is recommended for reliable sprint deceleration analysis.
• Practitioners should consider this approach to optimize the sensitivity and reliability of performance profiling.
• This enhances the ability to track meaningful changes in athlete performance and injury prevention strategies.