Work

Effects of back-support passive exoskeletons on biomechanical loads and postural stability during simulated manual timber felling

Year: 2026

Type: article

Abstract: This study evaluated the effects of passive back-support exoskeletons (BSEs) on biomechanical load and postural stability during simulated manual timber felling at three cutting heights. Twenty healthy adult male participants performed timber felling tasks under four BSE conditions (two rigid, one soft, and no BSE). During the tasks, electromyographic (EMG) activity, trunk angle, postural sway, and perceived exertion were measured. Results showed that rigid BSEs reduced trunk flexion and low back EMG activity at the middle cutting height, where trunk flexion was greatest. No significant changes were observed at low or high cutting heights, likely due to insufficient exoskeleton engagement. BSE use shifted postural control strategies rather than providing a uniform stabilizing effect. Additionally, BSEs lowered perceived exertion for the whole body and low back. These findings suggest that BSEs may help reduce low back loading at the middle cutting height during manual timber felling, but further field testing is warranted. • Passive back-support exoskeletons were tested during simulated timber felling tasks. • Rigid exoskeletons reduced low back muscle activity, primarily at the middle cutting height. • BSEs reduce low back load at trunk flexion angles exceeding 20–30°.

Source: Applied Ergonomics

DOI: 10.1016/j.apergo.2026.104734

Authors: Seobin Choi, Kiana Kia, Allen Chan, Mina Salehi, Woodam Chung, Jeong Ho Kim

Institutions: Incheon National University, Oregon State University, Texas A&M University

Language: English

Topic: Prosthetics and Rehabilitation Robotics

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,400