筋活動からみたしつ関節機能評価　ＩＩ　　若年者と比較した老年者の特徴

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タイトル別名
  • EVALUATION OF THE KNEE JOINT FUNCTION
  • 第2部 若年者と比較した老年者の特徴

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The first objective of this study was to investigate the EMG pattern of knee joint muscles, the inner hamstrings, vastus lateralis, vastus medialis, rectus femoris and vastus intermedius during some ADL movements. Those movements included level walking, ascending and descending stairs, rising from a chair, standing up from deep knee bending, standing up from Japanease way of sitting and stepping up on a stool (42cm in height).<br>The second objective was to find differences between the young and the aged in each movement. Sixteen aged persons ranging in age from 64 to 82 years and ten young persons from 22 to 35 years.<br>In this study, an electrogoniometer of the knee and foot switches were simultaneously used.<br>A rectifying and smoothing method was used to process EMG activities, and each of time scale and magnitude was normalized.<br>The processed signals of several movement cycles were averaged.<br>Results of this study were as follows:<br>(1) The quadriceps muscles showed the highest activity during standing up from Japanese way of sitting and stepping up on a stool.<br>(2) During level walking, quadriceps muscles showed slight EMG activity which was approximately 10% of maximum in the young and 20% in the aged.<br>(3) The EMG activity of the rectus femoris took the different patterns from the vastus lateralis and vastus medialis during ADL movements.<br>(4) The EMG activity level of the aged group was higher than that of the young group during almost all ADL movements, especially in the inner hamstrings.<br>(5) Duration of EMG activities were longer in the aged, onset and cessation time of EMG were earlier and later in the aged during ascending and descending stairs respectively.

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