Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
권호 표지

Effects of Angle and Direction of Maximal Isometric Contraction of Non-Hemiparetic Knee on Electromyographic Activity of Hemiparetic Quadriceps Femoris in Patients With Stroke

뇌졸중 환자의 비마비측 슬관절 등척성 수축시 각도와 운동 방향이 마비측 대퇴사두근 활성도에 미치는 영향

  • Ki, Kyong-Il (Dept. of Physical Therapy. Bonifacio Hospital) ;
  • Kim, Suhn-Yeop (Dept. of Physical Therapy. College of Health Sports Science, Daejeon University) ;
  • Oh, Duck-Won (Dept. of Physical Therapy. College of Health Sports Science, Daejeon University) ;
  • Choi, Jong-Duk (Dept. of Physical Therapy. College of Health Sports Science, Daejeon University) ;
  • Kim, Kyung-Hwan (Dept. of Rehabilitation Science, The Graduate School, Daegu University)
  • 기경일 (보니파시오요양병원 물리치료실) ;
  • 김선엽 (대전대학교 보건스포츠과학대학 물리치료학과) ;
  • 오덕원 (대전대학교 보건스포츠과학대학 물리치료학과) ;
  • 최종덕 (대전대학교 보건스포츠과학대학 물리치료학과) ;
  • 김경환 (대구대학교 대학원 재활과학과)
  • Received : 2010.02.16
  • Accepted : 2010.05.05
  • Published : 2010.05.21
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Abstract

To develop effective training methods for strengthening a weakened quadriceps femoris muscle in hemiplegic patients, we examined the effects of maximal isometric contraction of the nonparalyzed knee joint on the electromyographic activities of the paralytic muscle. An electromyogram (EMG) was used to record the electromyographic activities of the paralytic quadriceps femoris muscle in 27 hemiplegic patients. The maximal isometric contraction was measured for each subject to normalize the electromyographic activities. The maximal isometric extension and flexion exercises were randomly conducted when the knee joint angles of the nonparalyzed knees were $0^{\circ}$, $45^{\circ}$, and $90^{\circ}$. The patients were encouraged to maintain maximal isometric contractions in both knee joints during each measurement, and three measurements were taken. A one-minute rest interval was given between each measurement to minimize the effects of muscle fatigue. An average from the three values was taken as being the root mean square of the EMG and was recorded as being the maximal isometric contraction. The electromyographic activity obtained for each measurement was expressed as a percentage of the reference voluntary contraction, which was determined using the values obtained during the maximal isometric contraction. The results of this study are summarized as follows: First, when the knee joint angle of the nonparalyzed knee was $0^{\circ}$, the electromyographic activities of the paralytic medial aspect of rectus femoris were related to measurement by a maximal isometric flexion exercise than by an extension exercise (p<.05). Second, when the knee joint angle of the nonparalyzed knee was $90^{\circ}$, the electromyographic activities of the paralytic lateral aspect of rectus femoris were related to measurement by a maximal isometric flexion exercise than by an extension exercise (p<.05). The results show that myoelectrical activities of paralytic quardriceps were not related to measurement angles and exercise directions of the nonparalized knee joint. Studies on various indirect intervention to improve muscular strength of patients with nervous system disorders of the weakened muscle should be constantly conducted.

Keywords

References

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