体幹前屈運動の運動学的および筋電図学的研究　　腰椎コルセットの効果について

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タイトル別名
  • Effects of Lumbar Brace on Trunk forward Bending. Kinematic and Electromyographic Analysis.
  • タイカン ゼンクツウンドウ ノ ウンドウガクテキ オヨビ キンデンズガクテキ ケンキュウ ヨウツイ コルセット ノ コウカ ニ ツイテ
  • Kinematic and Electromyographic Analysis
  • 腰椎コルセットの効果について

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Lumbar braces are often used for acute and chronic low back pain and for its prevention in work environments. However, the mechanism underlying the clinical efficacy of corsets is not well understood. The purpose of this study was to investigate the effects of lumbar corset on forward bending, that often triggers low back pain, with respect to lumbar and pelvic motion and electromyographic (EMG) activities of erectores spinae and rectus abdominis muscles. An electromagnetic tracking device was used in combination with surface EMG. Eighteen healthy young adults volunteered in the study. The forward bending was divided into flexion (from standing position to maximum bending) and extension (from maximum bending to standing position) phases for analysis. The results showed that flexion without brace began with predominance of lumbar over pelvic motion and ended with predominance of pelvic over lumbar motion and that extension was the reverse, as reported previously by others. The brace inhibited the initial lumbar motion in flexion, but had no apparent effects on lumbar and pelvic motion in extension. The EMG activities of erector spinae decreased in the terminal phase of flexion without corset (so called relaxation phenomenon usually seen), but with corset, they did not appear. In contrast to flexion, the EMG activities of erector spinae were not inhibited by brace in extension. We conclude that the primary effect of lumbar braces is restriction of lumbar motion particularly in the initial phase of flexion and that they do not have beneficial effects on the electrical activities of that muscle in the terminal phase of maximum flexion.

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