216 lec 13 Angular movement

what plane? what type of rotation? what axis?

Frontal plane

Roll

Anterioposterior axis

what plane? what type of rotation? what axis?

Transverse plane

Yaw

Longitudinal axis

what plane? what type of rotation? what axis?

Sagittarius plane

Pitch

Mediolateral axis

flexion, extension, hyperextension are___ rotations that occur on ___ plane along the ___ axis

Pitch

Sagittal

Mediolateral

Abduction, adduction, elevation, depression, lateral flexion are rotations that occur on plane along the __ axis

frontal

Roll

Anterioposterior

internal and external rotation, supination and pronation are ___rotations that occur on plane along the _ axis

Yaw

Transverse

Longitudinal

how do we measure angular movement in human body

connect center of rotation of 3 joints with 2 longitudinal segments >> identify joint angle

define relative angles

the angle at a joint

relative angle can either be ___ or ___

internal (angle on the inside of joint)

external (angle on the exterior surface of the joint

define absolute angle

space btw a body segment with respect to fixed line of reference

absolute angle measure the line’s position in space relative to ___ and ___

x-axis

y-axis

what is absolute angle good for

comparing angles of different things

whats degree

an arbitrary unit of measuring angles that simply divide a circle into 360 pieces

whats revolution

1 full turn around the circle

whats radian

a ratio btw the angle in a circle and the length of the arc

if the radius of a circle and the length of arc are equivalent, the angle must equal to ___ degree aka__

57.3 degree

1 radian

1 revolution = how much radian?

2 pie

to measure angles of static things or pictures, we use___

Basic goniometer

to measure angle of things during movement/dynamic, we use___

electrogoniometer

goniometers are widely used to assess___

range of motion

is the axis of rotation of a joint fixed? so what?

not fixed

we do not know the precise location of rotation. so we use estimate axis of rotation (aka Instant center)

angular distance (phi) vs displacement (theta)

BOTH describe object’s position in space

scalar VS vector (direction)

total amount of rotation VS change in angular position

angular speed (sigma) vs velocity (w-omega)

BOTH describe temporal pattern of movement

scalar VS vector

change in angular distance VS change in angular displacement over change in time

dynamic motion is characterized by a ____

change in angular velocity, aka angular acceleration

angular acceleration (change in angular velocity) is produced by ___

Torque

what does the sign in front of angular displacement n velocity mean

direction of rotation (clockwise or counter-clockwise)

what does the sign in front of angular acceleration mean

1. direction of torque

2. angular velocity is becoming more + or more -

linear vs angular kinemaitcs

describe change in position in space

describe change in rotations in space