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Home
The Concurrent Validity And Test-retest Reliability Of A Smartphone-based Markerless System.

Home
The Concurrent Validity And Test-retest Reliability Of A Smartphone-based Markerless System.

Related Experiment Video

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study

Published on: March 14, 2017

The Concurrent Validity and Test-Retest Reliability of a Smartphone-Based Markerless System.

Kristen F Nicholson¹, Jared J Duane², William Carter²

¹Department of Orthopaedic Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27101, USA.

Sensors (Basel, Switzerland)

|June 26, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

This study validates a smartphone-based markerless system for biomechanical analysis. While concurrent validity had limitations, the system shows acceptable convergence and good reliability for tracking athlete performance.

Keywords:

biomechanics countermovement jump criterion validity range of motion

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Area of Science:

Sports Science
Biomechanics
Human Movement Analysis

Background:

Accessible and portable biomechanical data aids sports scientists in data-driven decision-making.
Markerless motion capture systems offer potential for increased accessibility in sports analysis.

Purpose of the Study:

To assess the concurrent and convergence validity of a smartphone-based markerless system for biomechanical analysis.
To evaluate the test-retest reliability of this smartphone system for sports performance tracking.

Main Methods:

Concurrent recording of countermovement jumps using iPhones with Uplift Labs software and a Qualisys marker-based system.
Statistical analysis included Bland-Altman limits of agreement, mixed-effect linear regressions, and intraclass correlation coefficients (ICC).

Main Results:

The smartphone system exceeded a priori limits for concurrent validity but demonstrated acceptable convergence validity.
Test-retest reliability (ICC) for the smartphone system was high (95.5%), comparable to the marker-based system (94.4%).

Conclusions:

The smartphone-based markerless system shows promise for tracking athlete performance changes within sessions due to its reliability.
Further validation may be needed for precise concurrent biomechanical measurement across different athletes or conditions.