The aim of this study was (1) to determine the concurrent validity of a trunk tri-axial accelerometer system (DynaPort®MiniMod) with the GAITRite® system for spatio-temporal gait parameters at preferred, slow and fast self-selected walking speed that were recorded for averaged and individual step data in an older adult population and (2) to compare the levels of agreement for averaged step data from different walking distances and individual step data.