stair walking essential components
ascent- stance, swing. getting footy to next step. moving COM upward
descent- stance swing. controlling COM downward movement
stance phase of ascent
weight acceptance
pull up
forward continuance
stance phase of descent
foot clearance
foot placement
weight acceptance kinestamtics
hip flexion 60 degrees
knee flexion 70 degrees
ankle DF 15 degrees
weight acceptance kinetics
activity increases in knee and hip extensors, hip abductors soles and contralateral PF
pull up kinestamtics
hip flexion 40 degrees
knee flexion 50 degrees
ankle DF 15 degrees
pull up kinetics
very unstable- hip abductors working hard
knee> hip extensor working
forward continuance kinetics
hip and knee flexors reduce
forward continuance kinematics
hip and knee flexion reduce to 20 degrees
ankle moves towards plantargrade
foot clearance
hip and knee flexion increases
hip flexion- 50 deg
knee flexion- 80 degrees
ankle DF15 deg
weight acceptance decent kinematics
hip flexion- 10 deg
knee flexion 20 deg
ankle PF 20 deg
weight acceptance decent kinetics
mostly active knee extensors and PFs
cocontraction of tin ant
hip abductors also controlling hip/pelvis at toe off
forward continuance kinematics
minimal change at hip - 10 deg
knee flexion- 30 degrees
ankle DF- 20 deg
forward continuance kinetics
brief knee extension activity as body moves forward
controlled by ankle PF and knee extensors
controlled lowering kinematics
hip still 10-15 deg
knee flexion increases towards 90 deg
ankle DF 25 deg
controlled lowering kinetics
knee extensors working eccentrically
ankle has small period of eccentric activity, mostly soleus
foot placement kinematics
hip moving towards extension 10 deg flexion
knee extending to about 20 deg flexion
ankle PF 15-20 deg
foot placement kinetics
concentric hip extensors
eccentric knee flexors to control knee extension
small amount of ankle PFs to get appt down to step then DF to control landing
