發展協調障礙兒童步行時之肌電訊號分析與類神經網路應用(II)

CMUR > College of Health Care > Department of Sports Medicine > Research reports > Item 310903500/25305

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Title:	發展協調障礙兒童步行時之肌電訊號分析與類神經網路應用(II) Electromyography Analysis and Artificial Neural Network Application for the Children With Developmental Coordination Disorder During Walking (II)
Authors:	張怡雯
Contributors:	中國醫藥大學運動醫學系
Keywords:	發展協調障礙;肌電圖;變異數比例;頻率分析;Developmental coordination disorder;Electromyography;Variance ratio;Frequency analysis
Date:	2004-07
Issue Date:	2010-07-22 16:28:00 (UTC+8)
Abstract:	在學齡時期有一群兒童外表正常，沒有神經方面疾病、發展遲緩和智能不足，但動作發展上卻有著協調障礙存在，就稱為發展協調障礙。美國精神醫學學會將之定義為「可完成的動作和協調性顯著地遜於同等年齡和智商能力之兒童，以致嚴重地妨礙了理論上同年齡可完成的日常活動的症候群」。在日常生活中的各種活動中，最常使用到的節律性活動之一即為走路，也是需要骨骼肌肉系統與神經系統互相密切配合，才有平穩且協調性的步行動作完成。肌電訊號量測提供步態分析中，肌肉收縮模式的了解。因此，本研究的目的為研究發展協調障礙兒童在跑步機上走路時肌肉收縮的肌電圖訊號分析。共有四十六位兒童參與本實驗，其中包括發展協調障礙兒童二十一位、疑似發展協調障礙兒童十一位、及正常兒童十四位。利用表面電極，測量雙側之臀大肌、股直肌、腿後肌、脛前肌、及腓長肌之肌電訊號，在跑步機上走 13 分鐘，收集每分鐘之前 15 秒資料，分析變異數比例、平均頻率、及中位頻率，作為跑步機走路下肢肌肉收縮的時間空間及頻譜參數。結果顯示發展協調障礙兒童，在跑步機走路時之下肢肌電訊號的中位頻率及平均頻率比正常兒童明顯較低，可能顯示發展協調障礙兒童較易產生肌肉疲乏的現象。同時，作左右兩側肌電訊號對稱性比較時發現，發展協調障礙兒童左右兩側肌電訊號不對稱的情形比正常兒童還要多，顯示發展協調障礙兒童跑步肌走路的對稱性不若正常兒童。本實驗的結果，對於發展協調障礙的診斷與治療上，可提供更進一步的參考資訊。 During the early school years, a number of children present with specific coordination problems and display poor perceptual-motor skills. This condition is recognized as developmental coordination disorder (DCD), a deficit in the development of motor skills that is not directly associated with any mental retardation or physical disorder. In order to better understand the neural mechanism of motor control for the children with DCD, it would be valuable to investigate the temporospatial parameters as well as the parameters extracted from frequency analysis for children with DCD during treadmill walking with the electromyography measurement of the muscles in lower extremity. Forty six children, including 14 normal children, 11 children with borderline DCD and 21 children with DCD, were recruited in this study. Ten surface EMG electrodes were used in this study. The medial gastrocnemius, tibialis anterior, rectus femoralis, hamstring and gluteus maximum were measured bilaterally. The data were collected at the first 15 seconds of each minute within thirteen-minute treadmill walking. The variance ratio, mean frequency and median frequency were computed to compare the difference between normal children and the DCD children. The mean and median frequency values of the DCD group were substantially lower than those of normal group. It is implied that the muscles of the DCD children may have the higher risk or higher trend of muscle fatigue during long term activities. Also, the comparison between right and left sides were evaluated for bilateralism of the treadmill walking. DCD children tended to have more muscles with significant differences for the values of variance ratio during the treadmill walking. It is implied that the bilateralism of walking for the DCD group may be not as good as the normal children.
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