L15 - angle-angle Flashcards
(11 cards)
What is discrete data in movement analysis?
Single values extracted from a time-series (e.g., max knee angle).
What is a key limitation of using only discrete data?
It may ignore the full movement pattern, missing coordination or dynamic features.
What does time-series data represent?
A continuous record of a variable (e.g., joint angles) over time.
Why is coordination not always clear from two separate time-series curves?
Because the interaction between joints may be more obvious when angles are plotted against each other.
What is an angle-angle diagram?
A plot of one joint angle versus another to assess coordination between joints.
What does in-phase coordination look like in angle-angle diagrams?
Both joints move in the same direction — the line trends diagonally in a smooth, unified pattern.
What does anti-phase coordination look like in angle-angle diagrams?
Joints move in opposite directions, often producing looping or figure-8-like patterns.
What are key features to observe in angle-angle diagrams?
Starting point of the trajectory
Direction of movement (which way it goes)
Number of coordination changes
The shape and what it reveals about the movement phase (e.g., extension)
What does the shape of an angle-angle plot tell you?
It provides insights into the movement pattern, such as the timing and smoothness of joint extension or interaction.
What is topological equivalence in coordination analysis?
Whether one coordination pattern can be stretched into another or must be folded — helps determine if two patterns are meaningfully different.
Why is tracking coordination changes important in analysis?
Changes in coordination can indicate shifts in movement strategy, efficiency, or compensation patterns.
