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White Matter Hyperintensities, Exercise, and Improvement in Gait Speed: Does Type of Gait Rehabilitation Matter?
Author(s) -
Nadkarni Neelesh K.,
Studenski Stephanie A.,
Perera Subashan,
Rosano Caterina,
Aizenstein Howard J.,
Brach Jennifer S.,
Swearingen Jessie M.
Publication year - 2013
Publication title -
journal of the american geriatrics society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.992
H-Index - 232
eISSN - 1532-5415
pISSN - 0002-8614
DOI - 10.1111/jgs.12211
Subject(s) - gait , medicine , cingulum (brain) , physical medicine and rehabilitation , hyperintensity , rehabilitation , white matter , inferior longitudinal fasciculus , superior longitudinal fasciculus , preferred walking speed , balance (ability) , magnetic resonance imaging , physical therapy , tractography , fractional anisotropy , radiology
Objectives To examine whether white matter hyperintensities ( WMH s) on brain magnetic resonance imaging ( MRI ) in tracts in older adults with mobility impairment are linked to outcomes of gait rehabilitation interventions. Design Twelve‐week randomized controlled single‐blind trial. Setting University‐based mobility research laboratory. Participants Ambulatory adults aged 65 and older with mobility impairment. Intervention A conventional gait intervention focusing on walking, endurance, balance, and strength ( WEBS , n = 21) and a task‐oriented intervention focused on timing and coordination of gait ( TC , n = 23). Measurements Self‐paced gait speed was measured over an instrumented walkway before and after the intervention, and WMH and brain volumes were quantified on preintervention brain MRI using an automated segmentation process. A white matter tract atlas was overlaid on the segmented images to measure tract WMH volumes, and WMH volumes were normalized to total brain volume. Aggregate WMH volumes in all white matter tracts and individual WMH volumes in specific longitudinal tracts (superior longitudinal fasciculus, inferior longitudinal fasciculus, and fronto‐occipital fasciculus) and the cingulum were measured. Results Gait speed gains in the TC group were of the same magnitude, independent of WMH volume measures in all except the cingulum, but in the WEBS group, gain in gait speed was smaller with greater overall tract WMH volumes ( P < .001) and with greater WMH volume in the three longitudinal tracts ( P < .001 to .02). Conclusion Gains in gait speed with two types of gait rehabilitation are associated with individual differences in WMH s. Task‐oriented therapy that targets timing and coordination of gait may particularly benefit older adults with WMH s in brain tracts that influence gait and cognition.