高齢者に対応した歩数カウントアルゴリズムの開発 Development of a Step Count Algorithm for the Elderly

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Step counters are popular for quantifying walking. However, they may not measure the number of steps taken by elderly persons. In this study, we proposed a step count algorithm based on a filter bank and threshold processing to improve the accuracy of an accelerometer-type step counter for elderly persons. The accuracy of the proposed algorithm was compared with the observed steps taken during walking. The waist acceleration signals during self-paced walking were recorded for 74 attendees (age 82.7±8.6 yr, height 148.1±7.6 cm, weight 52.3±7.8 kg) participating in gait training at a rehabilitation services center using a triaxial accelerometer. The participants walked approximately 20 m(10 m in each direction and a turning arc). After seven different band-pass filters were applied to the magnitude of the acceleration vector, a signal related to the step cycle was selected from the outputs of those filters. Then, the number of steps was estimated from this signal using a predetermined threshold. The percent error was calculated as (estimated steps-observed steps)/observed steps×100. On verifying the algorithm using the data for the 74 elderly subjects, the steps taken by 57 (77.0%) were estimated with less than 10% error. We suggest that our step count algorithm is suitable for estimating the number of steps taken by elderly persons.

収録刊行物

  • 生体医工学 : 日本エム・イー学会誌

    生体医工学 : 日本エム・イー学会誌 46(2), 283-288, 2008-04-10

    社団法人日本生体医工学会

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各種コード

  • NII論文ID(NAID)
    110006793202
  • NII書誌ID(NCID)
    AA11633569
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    1347443X
  • NDL 記事登録ID
    9557943
  • NDL 雑誌分類
    ZS18(科学技術--医学--医用機械・診断学・検査技術)
  • NDL 請求記号
    Z19-108
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS 
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