Related Experiment Video
Updated: Nov 2, 2025
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Movement Retraining using Real-time Feedback of Performance
Published on: January 17, 2013
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Reliability and concurrent validity of TRAZER compared to three-dimensional motion capture.
Jennifer A Hogg1, Lynette M Carlson1, Abigail Rogers2
1Department of Health and Human Performance, The University of Tennessee Chattanooga, Chattanooga, TN, USA.
Journal of Clinical and Translational Research
|June 9, 2021
Summary
The TRAZER system shows strong test-retest reliability for agility metrics, making it useful for monitoring training and return-to-play decisions. However, its concurrent validity with 3D motion capture is limited for maximum output measures.
Area of Science:
- Sports Medicine
- Biomechanics
- Rehabilitation Technology
Background:
- Efficient visuospatial and proprioceptive processing is vital for preventing sports injuries.
- Clinically feasible tests are needed to identify neural processing deficiencies.
- 3D motion capture is the gold standard but is costly and requires expertise.
Purpose of the Study:
- To assess the concurrent validity of the TRAZER system against 3D motion capture.
- To evaluate the test-retest reliability of TRAZER's reactive agility metrics.
Main Methods:
- 13-18 healthy participants were assessed.
- Concurrent validity was determined using a single-session cross-sectional study.
- Test-retest reliability was assessed over three consecutive days.
- TRAZER system data was compared with Vicon 3D motion capture.
Main Results:
- Total distance correlation between TRAZER and 3D motion capture was high (r=0.961).
- Concurrent validity for maximum velocity and acceleration showed limited agreement.
- Test-retest reliability for average measures (velocity, acceleration, deceleration) was high (ICC > 0.84).
- Average reaction time reliability was fair (ICC=0.536).
Conclusions:
- The TRAZER system demonstrates strong test-retest reliability for agility metrics.
- Concurrent validity with 3D motion capture is limited for maximum output measures.
- TRAZER is clinically relevant for monitoring training and return-to-play decisions where gold standard validation is not critical.
