# A Usability Pilot Study of a Sensor-Guided Interactive System for Dexterity Training in Parkinson’s Disease

## TL;DR

A new interactive dexterity training system was found to be highly usable and effective for people with Parkinson’s disease and healthy adults.

## Contribution

A novel sensor-guided system for dexterity training was evaluated for usability and accuracy in detecting exercise repetitions.

## Key findings

- High usability scores were achieved for both Parkinson’s disease participants and healthy adults.
- The system accurately detected 85% of repetitions for Parkinson’s disease participants and 97% for healthy adults.
- The system requires refinement for better accuracy in specific pinch grip exercises.

## Abstract

This pilot study aimed to evaluate the usability of a new, feedback-based dexterity training system in people with Parkinson’s disease (PwPD) and healthy adults. Seven PwPD and seven healthy adults participated in the study. The System Usability Scale (SUS) and the Post-Study System Usability Questionnaire Version 3 (PSSUQ) were used to assess usability. Additionally, the feedback shown as a counter, detected through newly developed algorithms, was evaluated by comparing the device-detected repetitions during six exercises to those counted by a supervisor. High median SUS scores of 92.5 were obtained in both PwPD (IQR = 81.25–98.75) and healthy adults (IQR = 87.5–93.75, maximum score 100, minimum score 0). Similarly, high PSSUQ median scores were achieved after the session (1.14, IQR = 1.00–1.33, PD; 1.08, IQR = 1.00–1.58, healthy adults, maximum score 1, minimum score 7). PwPD completed 648 repetitions, with 551 (85%) correctly recognized by the system. For healthy adults, 883 out of 913 (97%) repetitions were classified as right. The present study showed high usability and high perceived user satisfaction for the new training system in all study participants. The system effectively detects exercise repetition rates but requires further refinement to enhance accuracy for specific pinch grip exercises.