Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6816
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Title: Ambulatory activity in men with diabetes : relationship between self-reported and real-world performance-based measures
Authors: Smith, DG
Domholdt, E
Coleman, KL
Del Aguila, MA
Boone, DA
Issue Date: Jul-2004
Source: Journal of rehabilitation research and development, July/Aug. 2004, v. 41, no. 4, p. 571-580
Abstract: The measurement of physical activity, especially walking activity, is important for many outcome studies. In many investigations, the Physical Activity scale of the short-form-36 (SF-36) health assessment questionnaire is used in lieu of an actual physical measurement of walking. This study determined the relationship between the SF-36 questionnaire and the Step Activity Monitor (SAM), a real-world performance-based tool that counts the actual number of steps taken during daily activities. We studied the physical activity of 57 men with diabetes using step count monitoring and the SF-36 questionnaire. The subjects averaged 3,293 steps/day, but had a very wide range (111-11,654) and a large standard deviation (SD = 2,037). The correlations between total daily steps and the SF-36 Physical Component Summary score, and the Physical Function, the Bodily Pain, and the Vitality scales of the SF-36 were only fair (Pearson r = 0.376, 0.488, 0.332, 0.380, respectively). The corresponding coefficients of determination range from only 7.7% to 23.8%. Physical activity is a complex concept not completely represented by either the SF-36 or the step counts. The correlation between actual walking activity and the SF-36 is not as strong as many researchers believe. Caution should be used using the SF-36 to specifically measure walking activity.
Keywords: Diabetes mellitus
Diabetic neuropathies
Health status indicators
Locomotion
Outcome assessment
Walking
Publisher: U.S. Department of Veterans Affairs, Rehabilitation Research and Development Service
Journal: Journal of rehabilitation research and development 
ISSN: 0748-7711
DOI: 10.1682/JRRD.2003.01.0019
Rights: The article is available at http://www.rehab.research.va.gov/jour/04/41/4/abssmith.html
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