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Using a Passive Back Exoskeleton During a Simulated Sorting Task: Influence on Muscle Activity, Posture, and Heart
Mona Bär, Tessy Luger1, Robert Seibt
1University of Tübingen and University Hospital Tübingen, Tübingen, Germany.
Human Factors
|February 28, 2022
Summary
A back exoskeleton reduced hip extensor muscle activity during a simulated sorting task. While it altered lower limb posture, it did not significantly change spine posture or other muscle activity, indicating further research is needed for practical applications.
Area of Science:
- Ergonomics and Human Factors
- Biomechanics
- Occupational Health
Background:
- Musculoskeletal demands in work tasks are a significant concern.
- Exoskeletons show potential for mitigating these demands.
- Clarifying the effectiveness of exoskeletons is crucial for workplace safety.
Purpose of the Study:
- To evaluate the impact of a back exoskeleton on muscle activity, posture, and heart rate.
- To assess exoskeleton use in a simulated sorting task with a static forward-bent trunk posture.
- To understand the biomechanical effects of exoskeleton assistance.
Main Methods:
- Thirty-six healthy males performed a 90-second sorting task in a 40° forward-bent posture.
- Muscle activity (erector spinae, biceps femoris, etc.) was measured using surface electromyography.
- Spine and lower limb postures were assessed using position sensors, and heart rate was monitored.
Main Results:
- The exoskeleton decreased biceps femoris muscle activity by 8.12%RVE.
- Minor changes were observed in other muscles (erector spinae, rectus abdominis, etc.).
- Hip and knee flexion increased, and heart rate decreased slightly.
Conclusions:
- Back exoskeletons primarily reduce hip extensor muscle activity in short-duration, static postures.
- Exoskeletons altered lower limb posture but not spine posture.
- Further investigation is needed to establish practical recommendations for exoskeleton use in various work scenarios.
