Mechanical and energetic determinants of impaired gait following stroke: segmental work and pendular energy transduction during treadmill walking.

Biology Open
Gustavo BalbinotLeonardo Alexandre Peyré-Tartaruga

Abstract

Systems biology postulates the balance between energy production and conservation in optimizing locomotion. Here, we analyzed how mechanical energy production and conservation influenced metabolic energy expenditure in stroke survivors during treadmill walking at different speeds. We used the body center of mass (BCoM) and segmental center of mass to calculate mechanical energy production: external and each segment's mechanical work (Wseg). We also estimated energy conservation by applying the pendular transduction framework (i.e. energy transduction within the step; Rint). Energy conservation was likely optimized by the paretic lower-limb acting as a rigid shaft while the non-paretic limb pushed the BCoM forward at the slower walking speed. Wseg production was characterized by greater movements between the limbs and body, a compensatory strategy used mainly by the non-paretic limbs. Overall, Wseg production following a stroke was characterized by non-paretic upper-limb compensation, but also by an exaggerated lift of the paretic leg. This study also highlights how post-stroke subjects may perform a more economic gait while walking on a treadmill at preferred walking speeds. Complex neural adaptations optimize energy production...Continue Reading

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Citations

Jul 2, 2021·Experimental Physiology·Leonardo A Peyré-TartarugaPaola Zamparo
Aug 17, 2021·Frontiers in Neurorobotics·Franchino PorciunculaLouis N Awad

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