L22, Relative Phase

Question 1

Objectives:

• To understand the use of discrete and continuous relative phase
• To apply continuous relative phase to gait and kicking

Answer 1

Summary:
- DRP used to show phase difference in timing of certain events
- CRP represents the difference in states of two variables throughout the movement
- CRP is four variables in one-two joint angles and two joint angular velocities
- Normalise data to centre phase planes around zero
- Look for how coordination changes under different constraints rather than “ideal” coordination

Question 2

What is discrete relative phase used for?

Answer 2

Relative timing between important instances in a movement.

Question 3

What does continuous relative phase represent?

Answer 3

The difference in states of two variables throughout the movement

Question 4

What does it mean to have a relative phase of >0?

Answer 4

Proximal segment is ahead of distal in phase space and vice versa.