Using the Active Movement Extent Discrimination Apparatus to Test Individual Proprioception Acuity: Implications for...

Area of Science:

• Neuroscience
• Biomechanics
• Human Movement Science

Background:

• The Active Movement Extent Discrimination Apparatus (AMEDA) is a widely used tool for assessing proprioception.
• Previous studies utilized the area under the curve (AUC) from absolute identification tests to show group differences.
• The suitability of the AMEDA for measuring individual proprioception acuity changes remains unclear.

Purpose of the Study:

• To evaluate the reliability and variance of the AMEDA's proprioception testing protocol for individual measurements.
• To compare obtained AUC scores with those from other studies and theoretical expectations.
• To assess the AMEDA's suitability for exploring individual proprioceptive performance.

Main Methods:

• Re-analysis of raw data from 65 participants tested multiple times on the ankle AMEDA.
• Calculation of individual response accuracy, sensitivity index (d'), and AUC.
• Assessment of reliability using intraclass correlation coefficient (ICC) and standard error of measurement (SEM).

Main Results:

• Fewer than 50% of stimuli were accurately identified, with poor discrimination between adjacent stimuli (median d' > 1 in only one instance).
• The ICC for AUC scores across tests was poor (0.47), indicating low reliability.
• Substantial individual performance variation resulted in a large SEM relative to the score distribution.

Conclusions:

• The AMEDA's current protocol demonstrates poor reliability and substantial variance for assessing individual proprioception acuity.
• The findings suggest that the existing testing methodology is not suitable for reliable individual proprioceptive performance evaluation.
• An alternative approach is necessary to effectively utilize the AMEDA for exploring individual proprioceptive capabilities.