Determining the Validity and Accuracy of Multiple Activity Tracking Devices in Controlled and Free-Walking Conditions: 1361 Board #36 June 1 9. (May 2017) - Gaz, Daniel; Rieck, Thomas; Peterson, Nolan; Ferguson, Jennifer; Schroeder, Darrell; Dunfee, Heather; Henderzahs-Mason, Jill; Hagen, Philip