Quality Assessment of a Foot-Mounted Inertial Measurement Unit System to Measure On-Field Spatiotemporal Acceleration...

Area of Science:

• Sports Biomechanics
• Wearable Technology
• Athletic Performance Analysis

Background:

• Increasing use of wearable technology in field sports for biomechanical assessment.
• Inertial measurement units (IMUs) offer a low-cost, non-invasive method for gait analysis.
• Need for accurate sprint kinematic estimation using IMUs.

Purpose of the Study:

• Evaluate the accuracy and concurrent validity of a foot-mounted IMU system.
• Assess the system's ability to estimate sprinting kinematics.
• Determine the reliability of IMU-derived gait metrics during maximal sprints.

Main Methods:

• Twenty-five elite and sub-elite athletes participated.
• Maximal 10-metre fly sprints were performed.
• Concurrent measurement using 3D motion analysis and foot-mounted IMUs.

Main Results:

• Low root mean square errors for stride length (0.22 m) and duration (0.04 s).
• Acceptable biases for peak velocity (-0.67 m/s) and instantaneous acceleration (0.17 m/s²).
• Good agreement for stride length, duration, and cadence compared to 3D motion analysis.

Conclusions:

• The foot-mounted IMU system demonstrates accuracy and validity for sprint kinematics.
• Findings should be considered relative to specific analytical goals and constraints.
• Adoption of IMU technology should align with desired performance metrics and outcomes.