wheelchair propulsion
Post on 11-Apr-2017
386 Views
Preview:
TRANSCRIPT
PowerPoint Presentation
Task Determinants of Wheelchair PropulsionKacie WashburnSamantha Jensen
970-310-6394
No matter which way I do It, what do I have to be able to do?1
Push PhaseApply a grip to the pushrim Stabilize base of support Transfer a force from the upper extremity to the pushrim
1. Apply a grip force to the pushrim
High Impact Force on the Wrist
2. Stabilize base of support
Postural Control
6
3. Transfer a force from UE to pushrim
STYLESFORCE REQUIRED0.56 Newtons0.58 Newtons0.45 Newtons
Contact Angle
Minimum amount of joint mobility9
Surface Effects
HardwoodCarpetRamp0.45 Newtons0.54 Newtons0.52 Newtons
Peak Torque occurs at 30-40 degrees into the push phase
Push phase Kinematics
Early Push Phase:Late Push Phase:ROMMusclesShoulderFlexionAnterior DeltoidElbow ExtensionTricepsWristRadial DeviationExtensor Carpi Radialis
ROMMusclesShoulderFlexionAnterior Deltoid, PectoralisElbow ExtensionTricepsWristUlnar DeviationExtensor Carpi Ulnaris
Recovery PhaseRelease the grip from the pushrimReturn the upper extremity to its original position
4. Release Grip
5. Return to Original Position
Recovery Kinematics
Early Recovery Phase:Late Recovery Phase:ROMMusclesShoulderExtensionPosterior Deltoid, TricepsElbow ExtensionTricepsWristNeutralN/A
ROMMusclesShoulderExtensionPosterior Deltoid, TricepsElbow FlexionBicepsWristRadial DeviationExtensor carpi radialis
Efficiency: Work per Metabolic Energy 5-10%20-25%
Wheelchair Fit
A: angle too small C: angle is too largeB:correct angle = 100-120
Semicircular Propulsion Style
Length or distance hands are in contactMinimum angle
Normalize force by percent body mass
Transfer load from UE to rim
StabilityStability to create mobility Force from a fixed unit 19
Think About Swimming
top related