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force subject measurement acceleration platform movement vibration stroke patient study drift difference condition orthopaedic shoe 1.0 pedar value device system duration sts movement duration orthopaedic insole effect accelerometry speed frequency platform accelerations sts movement spasticity table tardieu weight reliability muscle direction inter-rater reliability sensor analysis result method correction rehabil angle powermaxx position goniometry powerplate video sts movements ground reaction force stroke patients fout values scale signi galileo period performance stroke subjects score measure technique kistler accelerometer gait characteristics pedar system fi xed bias 30 hz ankle validity posture –retest loading trunk reaction ground inter-rater signal test –retest 25 hz