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Arch Phys Med Rehabil. 2012 Jun;93(6):1072-6. doi: 10.1016/j.apmr.2012.01.005. Epub 2012 Mar 29.

The strength of the ankle dorsiflexors has a significant contribution to walking speed in people who can walk independently after stroke: an observational study.

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1
Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia.

Abstract

OBJECTIVE:

To investigate the relationship between the strength of muscles of the affected lower limb and walking speed after stroke.

DESIGN:

A cross-sectional observational study.

SETTING:

University laboratory.

PARTICIPANTS:

Stroke survivors (N=60; mean age ± SD, 69±11y) 1 to 6 years poststroke, able to walk 10m independently without aids.

INTERVENTIONS:

Not applicable.

MAIN OUTCOME MEASURES:

Maximum isometric strength of 12 muscle groups (hip flexors/extensors, adductors/abductors, internal/external rotators, knee flexors/extensors, ankle dorsiflexors/plantarflexors, invertors/evertors) of the affected lower limb was measured using hand-held dynamometry. Comfortable walking speed was measured using the ten-meter walk test.

RESULTS:

Univariate analysis revealed that strength of the hip flexors (r=.35, P=.01), hip extensors (r=.29, P=.03), hip internal rotators (r=.30, P=.02), hip adductors (r=.29, P=.03), knee extensors (r=.27, P=.03), knee flexors (r=.30, P=.02), ankle dorsiflexors (r=.50, P=.00), ankle plantarflexors (r=.29, P=.03), and ankle evertors (r=.33, P=.01) were all positively associated with walking speed. Multivariate analysis (n=58) revealed that the combined strength of the ankle dorsiflexors and the hip flexors accounted for 34% of the variance in walking speed (P<.001). The ankle dorsiflexors accounted for 31% of the variance (P<.001).

CONCLUSIONS:

The strength of muscle groups other than the lower limb extensors, particularly the ankle dorsiflexors, has an important role in determining walking speed after stroke.

PMID:
22464738
DOI:
10.1016/j.apmr.2012.01.005
[Indexed for MEDLINE]
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