A Physical Activity Reference Data-Set Recorded from Older Adults Using Body-Worn Inertial Sensors and Video Technology—The ADAPT Study Data-Set

• Published in: Sensors (Basel, Switzerland) Vol. 17; no. 3; p. 559
• Main Authors: Bourke, Alan, Ihlen, Espen, Bergquist, Ronny, Wik, Per, Vereijken, Beatrix, Helbostad, Jorunn
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 10.03.2017; MDPI
• Subjects: activity; Aged; algorithm; Algorithms; classification; Exercise; Humans; inertial-sensor; Laboratories; Movement; Older people; Sensors; Technology; validation; inertial-sensor; activity; classification; validation; algorithm
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s17030559

Physical activity monitoring algorithms are often developed using conditions that do not represent real-life activities, not developed using the target population, or not labelled to a high enough resolution to capture the true detail of human movement. We have designed a semi-structured supervised laboratory-based activity protocol and an unsupervised free-living activity protocol and recorded 20 older adults performing both protocols while wearing up to 12 body-worn sensors. Subjects’ movements were recorded using synchronised cameras (≥25 fps), both deployed in a laboratory environment to capture the in-lab portion of the protocol and a body-worn camera for out-of-lab activities. Video labelling of the subjects’ movements was performed by five raters using 11 different category labels. The overall level of agreement was high (percentage of agreement >90.05%, and Cohen’s Kappa, corrected kappa, Krippendorff’s alpha and Fleiss’ kappa >0.86). A total of 43.92 h of activities were recorded, including 9.52 h of in-lab and 34.41 h of out-of-lab activities. A total of 88.37% and 152.01% of planned transitions were recorded during the in-lab and out-of-lab scenarios, respectively. This study has produced the most detailed dataset to date of inertial sensor data, synchronised with high frame-rate (≥25 fps) video labelled data recorded in a free-living environment from older adults living independently. This dataset is suitable for validation of existing activity classification systems and development of new activity classification algorithms.