Slipper Sandals With Insoles Made From Natural Loofah Fiber Treated With 3% NaOH Based On Plantar Pressure Distribution To Improve The Stability Of Elderly When Walking

Abstract

The growing elderly population necessitates footwear innovations that improve stability during walking. This study assessed the plantar pressure distribution of hotel slippers and slippers made from natural loofah fiber treated with 3% NaOH to enhance fiber mechanical properties. Plantar pressure was measured using Force Sensing Resistor (FSR) sensors placed at medial forefoot, lateral forefoot, midfoot, and heel. Two female groups participated: a control group aged 19–22 years and an elderly group aged ≥60 years. In the elderly group, slippers loofah achieved a midfoot pressure distribution of 20,82% and heel distribution of 38,02%, which was more balanced compared to hotel slippers with 25,32% at the midfoot and 44,89% at the heel. In the control group, slippers loofah produced 21,68% at the midfoot and 45,90% at the heel, while hotel slippers recorded 25,41% and 51,78%. These results indicate that in the elderly group, slippers reduced peak pressures at specific points and improved load distribution across the sole. In the control group, plantar pressure patterns were relatively stable for both footwear types, though slippers still showed better balance. In conclusion, loofah-based insoles treated with 3% NaOH can promote balanced plantar load distribution and potentially enhance walking stability in the elderly.