Clip-On IMU System for Assessing Age-Related Changes in Hand Functions

Area of Science:

• Biomechanics
• Gerontology
• Rehabilitation Engineering

Background:

• Hand function is crucial for daily living and instrumental activities.
• Traditional assessments like the box and block test offer overall performance but lack kinematic detail.
• Wearable Inertial Measurement Unit (IMU) systems offer potential for detailed hand movement analysis.

Purpose of the Study:

• To introduce a novel clip-on IMU system for precise measurement of fine-motor finger and wrist movements.
• To clinically validate the IMU system by assessing age-related changes in hand function.
• To compare kinematic parameters of hand movements between young and older adults during a functional task.

Main Methods:

• Development and clinical validation of a novel clip-on IMU system.
• Evaluation of 18 young adults (20-31 years) and 16 healthy older adults (75-89 years).
• Participants performed the box and block test, with hand and wrist movements captured by the IMU system.

Main Results:

• Older adults demonstrated significantly slower movement times during grasping, transporting, and releasing blocks.
• Increased kinematic variability and alterations were observed in older adults' finger and wrist movements.
• Specific kinematic changes included a larger range of motion at the fingers and altered kinematic trajectories in older adults.

Conclusions:

• The proposed IMU system effectively captures detailed performance and kinematic parameters of fine-motor hand movements.
• Age-related differences in hand function are characterized by reduced speed, increased variability, and distinct kinematic alterations.
• This technology offers enhanced insights into hand function, with potential applications in clinical assessment and rehabilitation.