title: Introducing a modular activity monitoring system.
abstract: In this paper, the idea of a modular activity monitoring system is introduced. By using different combinations of the system's three modules, different functionality becomes available: 1) a coarse intensity estimation of physical activities 2) different features based on HR-data and 3) the recognition of basic activities and postures. 3D-accelerometers--placed on lower arm, chest and foot--and a heart rate monitor were used as sensors. A dataset with 8 subjects and 14 different activities was recorded to evaluate the performance of the system. The overall performance on the intensity estimation task, relying on the chest-worn accelerometer and the HR-monitor, was 94.37%. The overall performance on the activity recognition task, using all three accelerometer placements and the HR-monitor, was 90.65%. This paper also gives an analysis of the importance of different accelerometer placements and the importance of a HR-monitor for both tasks.
authors.affiliation: German Research Center for Artificial Intelligence, DFKI, 67663 Kaiserslautern, Germany. attila.reiss@dfki.de
authors.forename: Attila
authors.initials: A
authors.lastname: Reiss
authors.forename: Didier
authors.initials: D
authors.lastname: Stricker
mesh_terms: D000054:Acceleration; D056044:Actigraphy / Q000295:instrumentation*; D004562:Electrocardiography / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009043:Motor Activity / Q000502:physiology*; D018511:Systems Integration