Sit-To-Stand Movement Evaluated Using an Inertial Measurement Unit Embedded in Smart Glasses-A Validation Study

Area of Science:

• Biomechanics
• Wearable Technology
• Sensor Technology

Background:

• Wearable sensors are increasingly used for biomechanical analysis of movements.
• Head-level sensor placement for movement analysis is less explored.
• Smart eyeglasses offer a novel platform for head-mounted inertial measurement units (IMUs).

Purpose of the Study:

• To assess the reliability and concurrent validity of an IMU in smart eyeglasses.
• To measure head acceleration during sit-to-stand (STS) movements.
• To compare IMU data with an optoelectronic system.

Main Methods:

• Nineteen healthy participants performed standardized STS movements at different speeds and with/without a cervical collar.
• An IMU embedded in smart eyeglasses was compared to an optoelectronic system.
• Intra- and inter-session reliability and concurrent validity were analyzed.

Main Results:

• The IMU in smart eyeglasses showed good to excellent relative reliability (ICC: 0.78–0.91).
• Excellent absolute reliability was observed (SEM < 10% of mean).
• Significant correlations (p < 0.001) confirmed concurrent validity with the optoelectronic system for vertical and anteroposterior acceleration.

Conclusions:

• IMUs in smart eyeglasses are accurate for measuring vertical head acceleration during STS movements.
• This technology shows potential for biomechanical assessment in various settings.
• Future research should explore clinical applications and elderly populations.