Work

Optimal Sensor Placement and Minimal Sensor Combination for Step Width Estimation Using Inertial Measurement Unit-based Gait Data

Year: 2026

Type: article

Abstract: Keywords: step width, gait analysis, insole, inertial measurement unit (IMU), daily useStep width is an important indicator of gait stability and fall risk, and continuous assessment in daily life is required.Although step width can be estimated from gait data collected using inertial measurement units (IMUs), the minimal IMU placement suitable for continuous use in daily life has not been clarified.In this study, we evaluated the step width estimation accuracy across different sensor configurations using gait data collected from IMUs attached to the waist and shank, and, for the first time, an IMU embedded in the insole.Gait data from 24 healthy males were used, and step width was estimated using a deep learning model to evaluate the performance of each sensor configuration.Overall, the combination of insole and waist IMUs showed the highest accuracy, achieving a mean absolute error (MAE) of 39.95 ± 13.39 mm, and among single sensor configurations, the insole IMU achieved the best performance with an MAE of 45.41 ± 14.87 mm.Considering ease of attachment and practical use in daily life, the insole IMU may be a promising sensor configuration that enables high accuracy step width estimation with minimal burden.

Source: Sensors and Materials

DOI: 10.18494/sam6087

Authors: Kyosuke Fukamachi, Tomohito Yamamoto, Susumu Sato, Takashi Kawanami

Institution: Kanazawa Institute of Technology

Language: English

Topic: Gait Recognition and Analysis

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $748