Physiological consequences of using an upper limb exoskeleton during manual handling tasks.

Area of Science:

• Ergonomics and Human Factors
• Biomechanics
• Occupational Health

Background:

• Manual handling tasks pose risks for musculoskeletal injuries.
• Upper limb exoskeletons are designed to reduce physical strain during these tasks.
• Comprehensive physiological assessment of exoskeleton use is needed.

Purpose of the Study:

• To evaluate the physiological effects of using an upper limb exoskeleton during manual handling.
• To assess muscle activity, kinematics, balance, and cardiac cost with and without an exoskeleton.
• To understand the trade-offs in physiological responses.

Main Methods:

• Participants performed load lifting, carrying, and stacking tasks with and without an exoskeleton.
• Muscle activity (electromyography), upper limb kinematics, postural balance, and cardiac cost were measured.
• Comparison between exoskeleton (EXOS) and free (FREE) conditions.

Main Results:

• Exoskeleton use significantly reduced deltoid anterior muscle activity during lifting and stacking.
• Increased triceps brachii and tibialis anterior activity observed during lifting with exoskeleton.
• Exoskeleton use altered upper limb kinematics and tended to increase cardiac cost during lifting.
• Triceps brachii activity decreased during carrying with the exoskeleton.

Conclusions:

• Upper limb exoskeletons can reduce shoulder muscle load during specific manual handling tasks.
• Exoskeleton use can lead to compensatory increases in antagonist muscle activity and postural demands.
• Broader physiological consequences, including cardiovascular demand and kinematic changes, must be considered.
• The overall benefits and drawbacks of exoskeleton use require careful evaluation for different tasks.