Spectral Electromyographic Fatigue Analysis of Back Muscles in Healthy Adult Men and Women During Sorensen Test

근전도를 이용한 Sorensen 검사시 성인남녀 등 근육의 근피로도 분석

  • Lee, Mi-Seon (Dept. of Rehabilitation Therapy, The Graduate SchooI, Yonsei University) ;
  • Kim, Tae-Young (Dept. of Rehabilitation Therapy, The Graduate SchooI, Yonsei University)
  • 이미선 (연세대학교 대학원 재활학과 물리치료전공) ;
  • 김태영 (연세대학교 대학원 재활학과 물리치료전공)
  • Published : 1998.09.19


Trunk holding test (Sorensen test) appear to have more value than strength test in prediction the occurrence of low back pain. Electromyographic activity of trunk extensor muscles during these test may provide clues to the etiology of neuromuscular-based low back pain. This study investigated the difference in back muscle endurance between healthy adult men and women using surface electromyographic (EMG) power spectral analysis. Thirty hea1thy subjects (15 men and 15 women) performed an unsupported trunk holding test for 60 seconds. Recording surface electrodes were placed over the erector spinae medially and laterally at vertebral levels of $L_1$ and $L_5$. Slope of total frequency was evaluated using the MP100WSW Fast Fourier Transform spectrum analysis program. The slopes of all indices of back muscle fatigue, except right $L_5$, were significantly steeper in men than in women (p<0.05). Our results indicated that the trunk holding test using EMG power spectral analysis of erector spinae muscles is useful for the evaluation of fatigue rate of these muscles. Our results also showed a higher muscle endurance in healthy adult women than in men.