The Changes of Range of Motion of Lumbar Region and Muscle Activities of Lumbar Extensor During Trunk Motions Between Subjects With Low Back Pain and Healthy Subjects

만성요통환자와 정상인의 체간 운동시 요추 신전근의 근활성도와 관절운동범위의 변화

  • Kim, Tae-Ho (Dept. of Physical Therapy, Daegu Health College)
  • 김태호 (대구보건대학 물리치료과)
  • Received : 2006.03.15
  • Accepted : 2006.04.01
  • Published : 2006.05.21

Abstract

The purpose of this study was to compare the electromyography (EMG) activities of the lumbar extensor muscles during motion of trunk flexion-extension and compare range of motion (ROM) with a 3-dimensional motion analysis system of the lumbar region between subjects with chronic low back pain (CLBP) and healthy subjects during the trunk flexion-extension, trunk rotation and trunk lateral flexion cycle. Thirty CLBP subjects and thirty healthy subjects were included. We measured the root mean square (RMS) value of the lumbar extensor muscles from resting, standing, lumbar flexion and return position. The RMS ratio was normalized from maximal EMG activity of the lumbar extensor muscles during trunk motion. The results of this study showed that the RMS ratio of the lumbar extensor was significantly higher in CLBP subjects than healthy subjects during all of trunk motion (p<.05). The ratio of the highest RMS value during flexion and extension was higher in CLBP subjects than in healthy subjects (p<.05). The ROM of the lumbar region was significantly lower in CLBP subjects than healthy subjects during trunk flexion-extension, trunk rotation and lateral flexion cycle. The relationship between the RMS ratio for full lumbar flexion and the ROM of lumbar flexion was not correlated significantly. CLBP subjects have both decreased ROM of the lumbar region and higher muscle activities of the lumbar extensor muscle than healthy subjects.