Events and phases structures the time axis of the time series. Events are defined by a event type name and a position. Phases are defined by a phase type name, a start and a end position. In Gait Analysis there is a common sense about some phases and events the data analyses typically is based on. E.g the gait plot sheets can visualize the toe off event as an upright line.

For motion analysis in general the definitioin of motion specific phases and events is useful.

Internal all is based on a potent API, which allows to model with algebra of sets. This is used e.g. for automatically heel strike detection, based on the foot markers or for detection of the phases the bottum of support is switched.

Events and phases are shown with the slider for the time axis.

(Bild)

Some special modelling elements are available to define events and phases. And there are some specialized ant tasks to deal with them.

Phase definition from J.Perry for a complete stride (from foot contact to footcatact of the same foot):

Phase name	Definition	Subphase name	Description	Defintion
stance	By RHS|LHS (foot strike) and RTO|LTO (foot off) events. Foot strike events can determined automatically, Foot off events must be set by the user based on the video and force plate data.	Initial contact
		load response
		mid stance
		terminal stance
swing		pre swing
		initial swing
		mid swing
		terminal swing