Darcy Ummels

The validation of a pocket worn activity tracker | 107 5 sooner. However, this study is performed on a group level and not on an individual level. Therefore, the interpretation on an individual level must be performed carefully since the optimized algorithm can both over ‐ and underestimate step count and physical behavior depending on the number of steps or seconds. For an activity tracker to be useful in daily life, validity is important, but feasibility is equally important. In a future feasibility study, development of a user ‐ friendly user ‐ interface of the MISS Activity will be addressed. The validated algorithm together with the user ‐ interface will be called the Measure It Super Simple (MISS) Activity. 43 Conclusion This study showed that the optimized algorithm parameter settings can more validly estimate step count, dynamic, standing, and sedentary time in older adults with a normal gait pattern wearing an activity tracker in their trouser pocket during a participant ‐ determined sequence activity protocol with activities of daily living compared to reference applications with generic activity tracker algorithms. For future studies and clinical practice an algorithm should ideally be optimized to the target population. Future work will include the development of a target group ‐ specific user ‐ friendly application. Acknowledgments We would like to thank Joey Gerritsen, Henk Marell, Harry Bakels and all participants who participated in this study. We thank Christopher McCrum for proofreading and editing an earlier version of the manuscript.