How task-relevant vibratory feedback from an active exoskeleton can lead to ergonomic postures.

Area of Science:

• Biomechanics
• Human-Computer Interaction
• Ergonomics

Background:

• Active exoskeletons traditionally reduce physical effort for workers.
• This approach does not encourage learning ergonomic postures, crucial for preventing musculoskeletal disorders.
• An alternative is using exoskeletons as biofeedback systems to guide users toward better postures.

Purpose of the Study:

• To investigate the use of exoskeletons as biofeedback systems to guide users towards ergonomic postures.
• To assess if participants adapt to and retain novel postures induced by exoskeletons.
• To evaluate the long-term impact on effort reduction and musculoskeletal disorder prevention.

Main Methods:

• Participants performed reach-to-hold movements with multiple possible final postures.
• Exoskeletons delivered posture-dependent vibrations as sensorimotor disturbances.
• Vibration intensity was adjusted to cancel out gravity efforts above or below preferred postures.

Main Results:

• Participants adapted to minimize vibrations, regardless of whether it increased or decreased gravity efforts.
• Novel postures were retained when they induced lower effort.
• Significant effort reduction was observed post-exposure in all participants.

Conclusions:

• Exoskeletons can be effectively used as biofeedback systems to improve user posture.
• This method shows potential for preventing musculoskeletal disorders in occupational settings.
• Further research can explore exoskeleton-based biofeedback for ergonomic training and rehabilitation.