Accuracy of Estimating Step Counts and Intensity Using Accelerometers in Older People With or Without Assistive Devices

in Journal of Aging and Physical Activity
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The purpose of this study was to examine the accuracy of uni- and triaxial accelerometers in monitoring step counts and gait intensity in older people who did or did not use an assistive device. Forty-nine healthy and frail older adults wore uniaxial (Lifecorder, Suzuken Co. Ltd.) and triaxial accelerometers (Activity Monitor, Matsushita Electronic Works, Ltd., and Active Style Pro, Omron Healthcare Co., Ltd.) during three trials at different gait speeds. All accelerometers gave relatively accurate step counts for healthy older participants compared with direct observation; however, the error was greater for frail older people with assistive devices. Gait intensity detection error was unaffected by gait speed. Among frail older people with assistive devices, the gait intensity error was smaller than for step count error. To accurately assess the steps walked or the gait intensity among frail older people using assistive devices, more study is needed on these groups of participants.

Park is with the Department of Physical Education, Korea University, Seoul, Korea; and the Department of Nutritional Education, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan. Ishikawa-Takata and Tanaka are with the Department of Nutritional Education, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan. Bessyo is with the Department of Nutritional Education, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan; and the Faculty of Human Nutrition, Seitoku University, Chiba, Japan. Tanaka is with the Department of Nutritional Science, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan. Kimura is with Mitoyo General Hospital, Kagawa, Japan.

Address author correspondence to Kazuko Ishikawa-Takata at kazu@nih.go.jp.