iTUG, a sensitive and reliable measure of mobility

Area of Science:

• Biomedical Engineering
• Neurology
• Rehabilitation Science

Background:

• The Timed Up and Go (TUG) test is a standard clinical tool for assessing mobility and balance.
• Traditional TUG analysis relies solely on total time, potentially missing nuanced motor deficits.
• Parkinson's disease (PD) significantly impacts balance and mobility, necessitating sensitive assessment tools.

Purpose of the Study:

• To introduce and validate the instrumented Timed Up and Go (iTUG) test for enhanced TUG assessment.
• To investigate the iTUG's ability to differentiate individuals with early Parkinson's disease (PD) from healthy controls.
• To evaluate the test-retest reliability of the iTUG and its subcomponents.

Main Methods:

• Development of the iTUG system utilizing portable inertial sensors to capture detailed movement data.
• Enrollment of 12 early-stage PD subjects and 12 age-matched controls.
• Comparison of iTUG metrics (cadence, arm-swing velocity, turning duration, turn-to-sit time) against traditional stopwatch TUG measurements.

Main Results:

• The standard TUG test showed no significant difference between early PD and control groups.
• The iTUG detected significant differences in cadence, arm-swing angular velocity, turning duration, and turn-to-sit time between groups.
• Gait, turning, and turn-to-sit subcomponents demonstrated high test-retest reliability, while sit-to-stand was less reliable.

Conclusions:

• The iTUG test offers superior sensitivity compared to the standard TUG for detecting early motor impairments in Parkinson's disease.
• iTUG provides objective, detailed analysis of TUG subcomponents, enhancing diagnostic and monitoring capabilities.
• The iTUG demonstrates good reliability for key mobility parameters, supporting its clinical utility in Parkinson's disease assessment.