Fig. 1From: Improvement of walking speed and gait symmetry in older patients after hip arthroplasty: a prospective cohort studyRaw cranio-caudal acceleration signal for 6 steps of one subject. The x-axis was time-normalized to 200 points for each stride (100 points per side). The vertical dotted line represents the trigger set 50 ms before the maximum amplitude for one stepBack to article page