Ashley M Goodwin1,2, Kayla M D Cornett3, Marnee J McKay4, Joshua Burns4, Carol Ewing Garber2, Darryl C De Vivo3, Jacqueline Montes1,3. 1. Department of Rehabilitation and Regenerative Medicine, Program in Physical Therapy, Columbia University Irving Medical Center, New York, New York. 2. Teachers College, Columbia University, New York, New York. 3. Department of Neurology, Columbia University Irving Medical Center, New York, New York. 4. The University of Sydney & The Children's Hospital at Westmead, Sydney, New South Wales, Australia.
Abstract
INTRODUCTION: The 6-minute walk test (6MWT) is a well-established clinical assessment of functional endurance, validated as a measure of walking ability in spinal muscular atrophy (SMA). The current availability of disease-modifying therapies for SMA indicates a growing need for normative reference data to compare SMA patients with healthy controls. METHODS: The literature was searched in two scientific databases. Studies were evaluated and selected based on adherence to American Thoracic Society guidelines for administering the 6MWT. Reference equations from the selected studies were applied to 6MWT data collected from SMA patients to calculate and compare % predicted values. RESULTS: Three pediatric and six adult studies were selected for comparison. The % predicted values using the pediatric and adult equations ranged from 47.7 ± 18.2% to 67.6 ± 26.2% and 43.0 ± 17.9% to 59.5 ± 26.2%, respectively, and were significantly different (P < 0.001). DISCUSSION: Results suggest significant variability between % predicted values derived from published reference equations in children and adults, despite adherence to 6MWT standardization.
INTRODUCTION: The 6-minute walk test (6MWT) is a well-established clinical assessment of functional endurance, validated as a measure of walking ability in spinal muscular atrophy (SMA). The current availability of disease-modifying therapies for SMA indicates a growing need for normative reference data to compare SMApatients with healthy controls. METHODS: The literature was searched in two scientific databases. Studies were evaluated and selected based on adherence to American Thoracic Society guidelines for administering the 6MWT. Reference equations from the selected studies were applied to 6MWT data collected from SMApatients to calculate and compare % predicted values. RESULTS: Three pediatric and six adult studies were selected for comparison. The % predicted values using the pediatric and adult equations ranged from 47.7 ± 18.2% to 67.6 ± 26.2% and 43.0 ± 17.9% to 59.5 ± 26.2%, respectively, and were significantly different (P < 0.001). DISCUSSION: Results suggest significant variability between % predicted values derived from published reference equations in children and adults, despite adherence to 6MWT standardization.
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