Step activity and stride-to-stride fluctuations are negatively correlated in individuals with transtibial amputation

Clinical Biomechanics
Jenny A KentShane R Wurdeman

Abstract

Variability occurs naturally from stride to stride in healthy gait. It has been shown that individuals with lower limb loss have significantly increased stride-to-stride fluctuations during walking. This is considered indicative of movement disorganization and is associated with less healthy movement. Given that lower limb prosthesis users perform on average less physical activity than able bodied individuals, the purpose of this study was to determine whether increased fluctuations also correspond to a reduced level of activity in daily life. Twenty-two transtibial amputees wore an activity monitor (Actigraph, Pensacola, FL, USA) for 3 weeks. Lower limb kinematics during treadmill walking were measured using a 12-camera motion capture system. The largest Lyapunov exponent (λ) was calculated bilaterally at the ankle, knee and hip to quantify the stride-to-stride fluctuations of the lower limb joints. Pearson correlations were used to identify the relationships between the average daily step count over the 3 week collection period and λ. Significant, moderate negative correlations between daily step count and λ were found at the intact ankle (r=0.57, P=0.005), and the knee on the affected side (r=0.44, P=0.038). No such correlat...Continue Reading

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Citations

Jul 16, 2020·Journal of Neuroengineering and Rehabilitation·Alix ChadwellPeter Worsley
Sep 2, 2016·American Journal of Physical Medicine & Rehabilitation·Shane R WurdemanNicholas Stergiou
Apr 29, 2021·Physical Therapy·Christopher K WongKameron N Jones

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