Sit-to-Stand Transitions Detection and Duration Measurement Using Smart Lacelock Sensor

TL;DR

This study introduces a shoe-mounted sensor system that accurately detects sit-to-stand transitions and measures their duration, aiding fall risk assessment and mobility monitoring in older adults.

Contribution

The paper presents a novel multimodal sensor and machine learning approach for precise sit-to-stand transition detection and duration measurement in aging populations.

Findings

Achieved 98% accuracy in classifying sit-to-stand transitions.

Mean absolute error in duration measurement was 0.047 seconds.

Demonstrated potential for real-world fall-risk assessment.

Abstract

Postural stability during movement is fundamental to independent living, fall prevention, and overall health, particularly among older adults who experience age-related declines in balance, muscle strength, and mobility. Among daily functional activities, the Sit-to-Stand (SiSt) transition is a critical indicator of lower-limb strength, musculoskeletal health, and fall risk, making it an essential parameter for assessing functional capacity and monitoring physical decline in aging populations. This study presents a methodology SiSt transition detection and duration measurement using the Smart Lacelock sensor, a lightweight, shoe-mounted device that integrates a load cell, accelerometer, and gyroscope for motion analysis. The methodology was evaluated in 16 older adults (age: mean: 76.84, SD: 3.45 years) performing SiSt tasks within the Short Physical Performance Battery (SPPB) protocol. Features extracted from multimodal signals were used to train and evaluate four machine learning classifiers using a 4-fold participant-independent cross-validation to classify SiSt transitions and measure their duration. The bagged tree classifier achieved an accuracy of 0.98 and an F1 score of 0.8 in classifying SiSt transition. The mean absolute error in duration measurement of the correctly classified transitions was 0.047, and the SD was 0.07 seconds. These findings highlight the potential of the Smart Lacelock sensor for real-world fall-risk assessment and mobility monitoring in older adults.