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J Neuroeng Rehabil. 2015 Apr 18;12:40. doi: 10.1186/s12984-015-0030-8.

Mechanisms to increase propulsive force for individuals poststroke.

Author information

1
Biomechanics and Movement Science Program, University of Delaware, 540 S. College Avenue, Suite 201F, Newark, DE, 19716, USA. haoyuan@udel.edu.
2
Delaware Rehabilitation Institute, Newark, DE, 19716, USA. bknarr@udel.edu.
3
Department of Mechanical Engineering, University of Delaware, Newark, DE, 19716, USA. higginso@udel.edu.
4
Department of Physical Therapy, University of Delaware, Newark, DE, 19716, USA. sbinder@udel.edu.

Abstract

BACKGROUND:

Propulsive force generation is critical to walking speed. Trialing limb angle and ankle moment are major contributors to increases in propulsive force during gait. For able-bodied individuals, trailing limb angle contributes twice as much as ankle moment to increases in propulsive force during speed modulation. The aim of this study was to quantify the relative contribution of ankle moment and trailing limb angle to increases in propulsive force for individuals poststroke.

METHODS:

A biomechanical-based model previously developed for able-bodied individuals was evaluated and enhanced for individuals poststroke. Gait analysis was performed as subjects (N = 24) with chronic poststroke hemiparesis walked at their self-selected and fast walking speeds on a treadmill.

RESULTS:

Both trailing limb angle and ankle moment increased during speed modulation. In the paretic limb, the contribution from trailing limb angle versus ankle moment to increases in propulsive force is 74% and 17%. In the non-paretic limb, the contribution from trailing limb angle versus ankle moment to increases in propulsive force is 67% and 22%.

CONCLUSIONS:

Individuals poststroke increase propulsive force mainly by changing trailing limb angle in both the paretic and non-paretic limbs. This strategy may contribute to the inefficiency in poststroke walking patterns. Future work is needed to examine whether these characteristics can be modified via intervention.

PMID:
25898145
PMCID:
PMC4406180
DOI:
10.1186/s12984-015-0030-8
[Indexed for MEDLINE]
Free PMC Article

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