Fig. 1From: Free-living gait characteristics in ageing and Parkinson’s disease: impact of environment and ambulatory bout length a Example of body worn monitor placement for both the laboratory based and free-living data collection. b Vertical acceleration and walking bout extraction (signal segments in black) from free-living data. c Example of gait characteristic extraction from walking bouts: detecting initial contacts (black stars) and final contacts (white circles). The black solid line represents vertical acceleration (av), the dashed line represents the differentiated with Gaussian CWT of av (avd), and the dotted line represents the differentiated with Gaussian CWT of avd (avdd). d Conceptual model of gait representing domains and 14 gait characteristicsBack to article page