Slipper Sandals with Insoles Made from Natural Loofah Fiber Based on Plantar Pressure Distribution to Improve Stability for the Elderly when Walking

Abstract

The growth of the elderly population in Indonesia is impacting the increasing need for footwear development designed to maintain comfort and walking stability. Even distribution of plantar pressure is one of the important factors in reducing discomfort and the risk of falls. This study aims to evaluate the plantar pressure distribution of loofah natural fiber insoles in slipper sandals compared to hotel sandals in control and elderly groups while walking. Measurements were taken using force-sensing resistor (FSR) sensors at four plantar points: medial forefoot, lateral forefoot, midfoot, and heel. This study involved two groups of female subjects: a control group aged 19–22 years and an elderly group aged ≥60 years. The research results show that loofah slipper sandals reduce the standard deviation value of plantar pressure compared to hotel sandals, both in the control group from 0.1923 to 0.1402 and in the elderly from 0.1415 to 0.1087, indicating a more even distribution of pressure. The adaptive characteristics of loofah to the contours of the foot, along with its fibrous texture, provide gentle tactile stimulation, potentially supporting postural balance. This indicates that loofah insoles could be an environmentally friendly alternative that supports more balanced plantar pressure distribution for the elderly.