Darcy Ummels

72 | Chapter 4 Box 4.1 About “ MOX Activity Monitor ”.  The MOX Activity Monitor contains a tri ‐ axial accelerometer.  The algorithm of the MOX was recently optimized and the algorithm settings were validated in an elderly  population.  The system can measure and transfer physical activity parameters continuously every second for 14 days.  Dust & Waterproof IPX8  CE ‐ certified  Wireless communication Bluetooth LE  Battery lifetime 14 days Based on the recent research of Ummels et al. 10 regarding the experiences of the elderly with eight different activity trackers, 53 important characteristics to create a meaningful user ‐ interface were determined (Appendix 4.1). For instance, three important characteristics from this list include the wearing location, outcome parameters, and feedback options. Thus, findings from Ummels et al. that have been broadly supported by the literature 11 - 13,15,19 - 32 were used as a departure point for the design of the user ‐ interface. In order to facilitate meaningful user experience and to assess the usage and experiences of the elderly with the activity tracker, this study was conducted with the following objectives: 1. to (re)design a user ‐ friendly interface of the MOX, meeting the requirements of the elderly by using the double diamond method. 2. to assess the elderly ’ s use and experiences of the adapted activity tracker in daily life. Methods This study consists of two methods that aim to answer the two aforementioned research questions (Figure 4.1) and were approved by a local ethics board (METC ‐ Z Medical Ethical Committee, METCZ20180012). Regarding the (re)design of the user ‐ interface, the double diamond method 33 was used. The double diamond method consists of four phases: the discovery, definition, development, and delivery phase. The discovery phase was completed in a preliminary