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Walk Ratio (Step Length/Cadence) as a Summary Index of Neuromotor Control of Gait: Application to Multiple Sclerosis

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Title: Walk Ratio (Step Length/Cadence) as a Summary Index of Neuromotor Control of Gait: Application to Multiple Sclerosis
Language: English
Authors: Rota, Viviana, Perucca, Laura, Simone, Anna
Source: International Journal of Rehabilitation Research. Sep 2011 34(3):265-269.
Availability: Lippincott Williams & Wilkins. 351 West Camden Street, Baltimore, MD 21201. Tel: 800-638-3030; e-mail: customerservice@lww.com; Web site: http://www.lww.com
Peer Reviewed: Y
Physical Description: PDF
Page Count: 5
Publication Date: 2011
Document Type: Journal Articles
Reports - Research
Descriptors: Physical Activities, Perceptual Motor Coordination, Neurological Impairments, Patients
DOI: 10.1097/MRR.0b013e328347be02
ISSN: 0342-5282
Abstract: In healthy adults, the step length/cadence ratio [walk ratio (WR) in mm/(steps/min) and normalized for height] is known to be constant around 6.5 mm/(step/min). It is a speed-independent index of the overall neuromotor gait control, in as much as it reflects energy expenditure, balance, between-step variability, and attentional demand. The speed independence of the WR in patients with multiple sclerosis (MS), and its capacity to discriminate (a) across patients with MS and controls and (b) among disability levels in MS were tested. The WR was computed in 30 outpatients with MS [20 women, 10 men; Extended Disability Status Scale (potential range: 0-10, observed median 3.5, range 2.5-5.0)] walking at free speed (range: 0.43-1.67 ms[superscript -1]), and in 30 healthy controls (20 women, 10 men) at free and slow speed (range: 0.55-1.67 ms[superscript -1]). The WR was 6.38 plus or minus 0.66 in controls versus 5.36 plus or minus 0.86 in patients with MS (P less than 0.000), independent of age, sex, and walking speed. The WR was 5.95 plus or minus 0.69 and 4.90 plus or minus 0.70 in patients with an Extended Disability Status Scale score (P less than 0.001) below or above the median, respectively, independent of the disease duration (P less than 0.000). In patients with MS, the WR is a disability-sensitive index of neuromotor control of gait, and thus a promising outcome measure for treatments aimed at improving motor coordination.
Abstractor: As Provided
Entry Date: 2011
Accession Number: EJ947166
Database: ERIC
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  Data: <searchLink fieldCode="SO" term="%22International+Journal+of+Rehabilitation+Research%22"><i>International Journal of Rehabilitation Research</i></searchLink>. Sep 2011 34(3):265-269.
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  Data: Lippincott Williams & Wilkins. 351 West Camden Street, Baltimore, MD 21201. Tel: 800-638-3030; e-mail: customerservice@lww.com; Web site: http://www.lww.com
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  Data: In healthy adults, the step length/cadence ratio [walk ratio (WR) in mm/(steps/min) and normalized for height] is known to be constant around 6.5 mm/(step/min). It is a speed-independent index of the overall neuromotor gait control, in as much as it reflects energy expenditure, balance, between-step variability, and attentional demand. The speed independence of the WR in patients with multiple sclerosis (MS), and its capacity to discriminate (a) across patients with MS and controls and (b) among disability levels in MS were tested. The WR was computed in 30 outpatients with MS [20 women, 10 men; Extended Disability Status Scale (potential range: 0-10, observed median 3.5, range 2.5-5.0)] walking at free speed (range: 0.43-1.67 ms[superscript -1]), and in 30 healthy controls (20 women, 10 men) at free and slow speed (range: 0.55-1.67 ms[superscript -1]). The WR was 6.38 plus or minus 0.66 in controls versus 5.36 plus or minus 0.86 in patients with MS (P less than 0.000), independent of age, sex, and walking speed. The WR was 5.95 plus or minus 0.69 and 4.90 plus or minus 0.70 in patients with an Extended Disability Status Scale score (P less than 0.001) below or above the median, respectively, independent of the disease duration (P less than 0.000). In patients with MS, the WR is a disability-sensitive index of neuromotor control of gait, and thus a promising outcome measure for treatments aimed at improving motor coordination.
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