Validity of 2 devices for measuring steps taken by older adults in assisted-living facilities.

BACKGROUND This 2-part study examined validity of selected motion sensors for assessing physical activity in older adults residing in assisted-living communities. METHODS Twenty-one older adults (mean age = 78.6 +/- 13.1 years) wore the StepWatch 3 Step Activity Monitor (SW3) and the Yamax Digi-Walker SW-200 pedometer (DW). Part I compared accuracy of these devices for measuring steps taken over 161 m. Part II compared devices over a 1-day (24-hour) period. RESULTS In part I, the DW recorded 51.9% (r2 = -.08, P = .75) and the SW3 recorded 102.6% (r2 = .99, P < .001) of steps. In part II, the DW measured significantly fewer steps (1587 +/- 1057 steps) than did the SW3 (6420 +/- 3180 steps). CONCLUSIONS The SW3 pedometer was more accurate in counting steps and recorded higher 24-hour step counts than the DW pedometer. Thus, the SW3 is a valid research instrument for monitoring activity in the assisted-living population.

[1]  D. Altman,et al.  STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT , 1986, The Lancet.

[2]  J F Sallis,et al.  Assessment of physical activity by self-report: status, limitations, and future directions. , 2000, Research quarterly for exercise and sport.

[3]  Daily ambulation activity and task performance in community-dwelling older adults aged 63-71 years with preclinical disability. , 2004, The journals of gerontology. Series A, Biological sciences and medical sciences.

[4]  Sung Gyoo Park.  Medicine and Science in Sports and Exercise , 1981 .

[5]  Gerald V. Smith,et al.  Microprocessor-based ambulatory activity monitoring in stroke patients. , 2002, Medicine and science in sports and exercise.

[6]  Scott E Crouter,et al.  Accuracy and reliability of 10 pedometers for measuring steps over a 400-m walk. , 2003, Medicine and science in sports and exercise.

[7]  B. Belza,et al.  Older Adult Perspectives on Physical Activity and Exercise: Voices From Multiple Cultures , 2004, Preventing chronic disease.

[8]  Usdhhs.  Physical Activity and Health: A Report of the Surgeon General , 1996 .

[9]  B E Ainsworth,et al.  Accuracy of five electronic pedometers for measuring distance walked. , 1996, Medicine and science in sports and exercise.

[10]  Barbara E Ainsworth,et al.  Comparison of pedometer and accelerometer measures of free-living physical activity. , 2002, Medicine and science in sports and exercise.

[11]  D M Buchner,et al.  Physical activity interventions targeting older adults. A critical review and recommendations. , 1998, American journal of preventive medicine.

[12]  Kim L Coleman,et al.  Accelerometer monitoring of home- and community-based ambulatory activity after stroke. , 2004, Archives of physical medicine and rehabilitation.

[13]  John D Sorkin,et al.  Steps After Stroke: Capturing Ambulatory Recovery , 2005, Stroke.

[14]  B. Resnick,et al.  Measurement of Activity in Older Adults: Reliability and Validity of the Step Activity Monitor , 2001, Journal of Nursing Measurement.

[15]  K. Patrick,et al.  Physical Activity and Public Health: A Recommendation From the Centers for Disease Control and Prevention and the American College of Sports Medicine , 1995 .

[16]  D A Boone,et al.  Step activity monitor: long-term, continuous recording of ambulatory function. , 1999, Journal of rehabilitation research and development.

[17]  Peter R. Cavanagh,et al.  Exercise and physical activity for older adults , 1998 .

[18]  L. Kamimoto,et al.  Overview: surveillance for selected public health indicators affecting older adults--United States. , 1999, MMWR. CDC surveillance summaries : Morbidity and mortality weekly report. CDC surveillance summaries.

[19]  E. Beattie,et al.  Estimates of stability of daily wandering behavior among cognitively impaired long-term care residents. , 1997, Nursing research.

[20]  Scott E Crouter,et al.  Validity of 10 electronic pedometers for measuring steps, distance, and energy cost. , 2003, Medicine and science in sports and exercise.

[21]  C. Tudor-Locke,et al.  Pedometer accuracy in nursing home and community-dwelling older adults. , 2004, Medicine and science in sports and exercise.

[22]  Catherine Ratzin Jackson,et al.  ACSM Position Stand: Exercise and Physical Activity for Older Adults , 2000 .