Validation of a Trunk-mounted Accelerometer to Measure Peak Impacts during Team Sport Movements

Area of Science:

• Sports Science
• Biomechanics
• Wearable Technology

Background:

• Accurate measurement of player impacts is crucial in team sports for injury prevention and performance analysis.
• Wearable accelerometers offer a practical solution for monitoring physical demands, but their validity needs rigorous assessment.

Purpose of the Study:

• To evaluate the concurrent validity of an accelerometer for measuring peak accelerations during various team sport movements.
• To determine the optimal filter cut-off frequency for accelerometer data to align with a motion analysis system.

Main Methods:

• 76 participants performed a team sport circuit, with accelerations recorded using an accelerometer and a 36-camera motion analysis system.
• Peak accelerations were compared using different filtering frequencies (6–25 Hz) and analyzed across seven distinct movements.
• Statistical analysis assessed accuracy, agreement, precision, and relative error between the two measurement systems.

Main Results:

• A 12 Hz cut-off frequency demonstrated the strongest correlation between accelerometer and motion analysis data.
• The 12 Hz filtered accelerometer data showed high accuracy (-0.01±0.27 g) and agreement (-0.55 to 0.53 g).
• Discrepancies were noted in specific movements like tackling and jumping, with lower agreement and precision during high-intensity actions.

Conclusions:

• Accelerometers exhibit acceptable concurrent validity for measuring team sport impacts when filtered at 12 Hz.
• The findings support the use of accelerometers as a valid tool for quantifying player movements and impacts in team sports.
• Optimal filtering is essential for accurate accelerometer-based analysis of biomechanical data in athletic populations.