Validation of Accelerometry Data to Identify Movement Patterns During Agility Testing

Area of Science:

• Biomechanics
• Sports Science
• Wearable Technology

Background:

• Accurate timing of movement is crucial for assessing athletic performance.
• Traditional timing methods may lack precision for specific movement phases.

Purpose of the Study:

• To develop and validate an algorithm for detecting foot contact and off-timing using accelerometers.
• To assess the reliability of accelerometer-derived timings in an agility test.

Main Methods:

• Participants performed a modified Edgren Side Step Test wearing ankle accelerometers.
• Accelerometer data was used to determine start, foot contact, and foot-off events.
• Accelerometer-derived timings were compared against stopwatch and video analysis.

Main Results:

• No significant difference was found between accelerometer-based overall time and stopwatch time.
• Bland-Altman analysis showed very good agreement for split and lag times compared to video.
• Inter- and intra-rater reliability for event identification was moderate to excellent.

Conclusions:

• An accelerometer-based algorithm can accurately determine foot contact and off-timing during agility tests.
• This method reliably provides split and lag times, offering additional insights beyond overall test duration.