EXSS 385- Angular Kinematics

who routinely analyzes human movement?

• clinicians

• coaches

• teachers of physical activities

what is angular kinematics based on observations of?

• timing

• range of motion

what is based on the analysis of angular kinematics?

developmental stages of motor skills

why is angular kinematics often of relevance to sports?

it helps us think about how we move around our joints’ axis

what are the five ways we could measure an angle?

• goniometer

• electro goniometer

• filmed images

• videotapes/films of human movement

• computer generated- VICON

how does one use a goniometer?

• one are is fixed to a protractor at 0 degrees

• other arm is free to rotate

• center of the goniometer is over the joint center

• the arms remain aligned over the longitudinal axis

what is a goniometer good for?

good way to measure post-surgery and give us a baseline for improvement and growth

what is sometimes difficult about using a goniometer?

you see the beginning and end ROM, but its not continuous through motion

what is the relative angle?

anatomical reference postion

what is an example of a relative angle?

angle between the forearm and upper arm

what is typically measured with goniometers?

relative angles

what is the absolute angle?

horizontal or vertical reference

what is the absolute angle relative to?

relative to the world around

what are absolute angles more focused on?

angles are more about coordinating movement and timing

how are angular distance and displacement assessed?

assessed as difference of initial and final positions

what is positive?

counterclockwise

what is counterclockwise?

positive

what is negative?

clockwise

what is clockwise?

negative

what are angular distance and displacement measured in?

• degrees

• radians

• revolutions

what is distance?

total amount traveled

what is displacement?

point a to point b

what is angular speed formula?

angular distance / change in time

what is angular velocity formula?

angular displacement / change in time

what are the units for angular speed and velocity?

• deg/s

• rad/s

• rev/s

• rpm

how are angular formulas described?

greek letters

what is the formula for angular acceleration?

change in angular velocity / change in time

what are the units for angular acceleration?

• deg/s²

• rad/s²

• rev/s²

what is the linear variable equal to?

the angular variable in radians multiplied by a radius of gyration

what is the formula of linear displacement from the angular variable?

what is the formula of linear velocity from the angular variable?

what is the formula of linear acceleration from the angular variable?

whatever happens linearly is equal to the angular in ________

radians

what are other terms for radius?

• distance from axis of rotation

• moment arm