하지거상운동시 자세변화에 따른 대퇴직근의 활동전위
Rectus Femoris Action Potentials under 4 Positions during Straight Leg Raising
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초록
The purpose of this study was to investigate which of 4 positions produced the highestaction potential in the rectus femoris muscle of normal adult subjects. Testing wasperformed in supine with the right leg performing a simple straight leg raise with the knee fully extended. The left leg, however, was placed in 4 different positions:1. Full support with O' flexion. 2. Flexed on the plinth with 60' knee flexion and foot flat. 3. Same as NO.2 but with 90' knee flexion. 4. Left leg hanging over the end of the plinth with 90' knee flexion, O' hip flexionand no foot support. This study was designed to compare the level of electromyographic activity of therectus femoris under 4 positions. Fourty-three healthy young adults performed threetrials of each exercise condition in random order in the supine position. Electromyographic activity was recorded from surface electrodes. Rectus femoris actionpotentials in all 4 positions were significantly different. The highest action potential atthe end of movement of the right leg occurred with the left leg hanging over the endof the plinth with 90' knee flexion. It is therefore recommended the straight leg raisingbe performed with the contralateral leg flexed at 90' over the end of the supportingsurface to obtain a maximum rectus femoris isometric contraction.
Abstract
The purpose of this study was to investigate which of 4 positions produced the highestaction potential in the rectus femoris muscle of normal adult subjects. Testing wasperformed in supine with the right leg performing a simple straight leg raise with the knee fully extended. The left leg, however, was placed in 4 different positions:1. Full support with O' flexion. 2. Flexed on the plinth with 60' knee flexion and foot flat. 3. Same as NO.2 but with 90' knee flexion. 4. Left leg hanging over the end of the plinth with 90' knee flexion, O' hip flexionand no foot support. This study was designed to compare the level of electromyographic activity of therectus femoris under 4 positions. Fourty-three healthy young adults performed threetrials of each exercise condition in random order in the supine position. Electromyographic activity was recorded from surface electrodes. Rectus femoris actionpotentials in all 4 positions were significantly different. The highest action potential atthe end of movement of the right leg occurred with the left leg hanging over the endof the plinth with 90' knee flexion. It is therefore recommended the straight leg raisingbe performed with the contralateral leg flexed at 90' over the end of the supportingsurface to obtain a maximum rectus femoris isometric contraction.