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Effects of Surface Inclinations and Carrying Aid Types on Postural Stability During Posterior Load Carriage in Rural
Khoirul Muslim1, Ni L P Setiawati1, Hardianto Iridiastadi1
1Department of Industrial Engineering, Faculty of Industrial Technology, Bandung Institute of Technology, Bandung, Indonesia.
Background:
Posterior load carriage (PLC) on inclined agricultural surfaces challenges postural stability. Traditional aids like fabric shawls are commonly used, but their biomechanical impacts are not well understood.
Aims:
This study examined how surface inclinations and different carrying aids affect postural stability and lower extremity posture during PLC.
Methods And Materials:
Twelve participants performed static PLC tasks using two carrying aids (i.e., a traditional fabric shawl and a custom-designed frame backpack) across three inclinations (-25º, 0º, 25º). Center of pressure (COP), joint angles, and subjective ratings of steadiness and discomfort were measured and analyzed using repeated measures ANOVA.
Results:
Uphill PLC significantly reduced stability and increased postural deviations. The frame backpacks improved stability but caused greater ankle and knee deviations. The fabric shawls minimized postural deviation but were less effective uphill.
Conclusions:
Frame backpacks enhance incline stability but may increase joint strain, highlighting the need for ergonomic design improvements.
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