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Published on: May 20, 2020
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Effects of a passive upper extremity exoskeleton for overhead tasks
Peng Yin1, Liang Yang2, Shengguan Qu1
1School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Summary
A Passive Upper-Limb Exoskeleton (PULE) significantly reduces muscle strain and perceived discomfort during overhead work. This wearable technology shows promise in preventing upper extremity work-related musculoskeletal disorders.
Area of Science:
- Ergonomics
- Biomechanics
- Occupational Health
Background:
- Overhead work is a primary risk factor for upper extremity work-related musculoskeletal disorders (WMSD).
- Existing interventions often lack sufficient mobility or user adaptability.
Purpose of the Study:
- To evaluate the effectiveness of a novel Passive Upper-Limb Exoskeleton (PULE) in mitigating the physical demands of overhead tasks.
- To assess the impact of PULE on muscle activity and perceived discomfort.
Main Methods:
- Fifteen male volunteers performed overhead bolt installation tasks with and without the PULE.
- Electromyographic (EMG) activity of key upper limb and back muscles (anterior deltoid, mid deltoid, descending trapezius, triceps) was recorded.
- Rankings of Perceived Discomfort (RPD) were collected for various body regions.
Main Results:
- Normalized EMG (nEMG) in the right anterior deltoid decreased by 38.5% and median nEMG values by 45.1% with PULE use.
- Total RPD scores were reduced by 52.4% when using the PULE.
- The PULE demonstrated a higher degree of freedom, not impeding natural user movement.
Conclusions:
- The PULE effectively reduces muscle load and perceived discomfort during overhead work.
- This technology has the potential to decrease the incidence or progression of WMSD in occupational settings involving repetitive overhead activities.
