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Algorithm for detecting moment before heel strike using only acceleration in the direction of travel

A deviation or stumble while walking can result in a fall, and in the worst-case scenario, cause elderly people with reduced muscle strength and bone density to become bedridden due to a fracture of the neck of the femur. The purpose of this study is to develop an algorithm that detects the time just before heel strike using only acceleration in the direction of travel, with the goal of preventing falls during walking. We sought to determine the point just before heel strike based on the sparse and dense difference in acceleration in the direction of travel during leg swing. We found heel strike could be discriminated 145 ms before the heel contacted the ground. By manufacturing a fall-prevention device that applies the algorithm created this study, we believe that fall prevention could be enabled by recruiting flexor reflexes.