title: Activity recognition in patients with lower limb impairments: do we need training data from each patient?
abstract: Machine learning allows detecting specific physical activities using data from wearable sensors. Such a quantification of patient mobility over time promises to accurately inform clinical decisions for physical rehabilitation. There are two strategies of setting up the machine learning problem: detect one patient's activities using data from the same patient (personal model) or detect their activities using data from other patients (global model), and we currently do not know if personal models are necessary. Here we consider the problem of detecting physical activities from a waist-worn accelerometer in patients who use a knee-ankle-foot orthosis (KAFO) to walk. We show that while a model based on healthy subjects has low accuracy, the global model performs as well as the personal model. This is encouraging because it suggests that condition-specific activity recognition algorithms are sufficient and that no data from individual patients is necessary.
authors.forename: Luca
authors.initials: L
authors.lastname: Lonini
authors.forename: Aakash
authors.initials: A
authors.lastname: Gupta
authors.forename: Konrad
authors.initials: K
authors.lastname: Kording
authors.forename: Arun
authors.initials: A
authors.lastname: Jayaraman
mesh_terms: D000465:Algorithms; D019992:Databases as Topic; D015444:Exercise / Q000502:physiology*; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D035002:Lower Extremity / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D009989:Orthotic Devices