Activity recognition with smartphone support

• Published in: Medical engineering & physics Vol. 36; no. 6; pp. 670 - 675
• Main Authors: Guiry, John J., van de Ven, Pepijn, Nelson, John, Warmerdam, Lisanne, Riper, Heleen
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.06.2014
• Subjects: Accelerometer; Accelerometry - instrumentation; Accelerometry - methods; Activities of daily living; Adult; Algorithms; Artificial Intelligence; Bicycling - physiology; Cell Phone; Equipment Design; Feasibility Studies; Female; Humans; Male; Monitoring, Ambulatory - instrumentation; Monitoring, Ambulatory - methods; Movement - physiology; Pattern Recognition, Automated - methods; Physical activity recognition; Posture - physiology; Radiology; Running - physiology; Smartphone classification; Thorax; Walking - physiology; Accelerometer; Smartphone classification; Activities of daily living; Physical activity recognition
• ISSN: 1350-4533; 1873-4030; 1873-4030
• DOI: 10.1016/j.medengphy.2014.02.009

In this paper, the authors describe a method of accurately detecting human activity using a smartphone accelerometer paired with a dedicated chest sensor. The design, implementation, testing and validation of a custom mobility classifier are also presented. Offline analysis was carried out to compare this custom classifier to de-facto machine learning algorithms, including C4.5, CART, SVM, Multi-Layer Perceptrons, and Naïve Bayes. A series of trials were carried out in Ireland, initially involving N=6 individuals to test the feasibility of the system, before a final trial with N=24 subjects took place in the Netherlands. The protocol used and analysis of 1165min of recorded activities from these trials are described in detail in this paper. Analysis of collected data indicate that accelerometers placed in these locations, are capable of recognizing activities including sitting, standing, lying, walking, running and cycling with accuracies as high as 98%.