Comparison of Muscle Activities of Thoracic and Lumbar Extensors during Trunk Lift Exercises According to Exercise Position

운동 자세에 따른 몸통 들기 운동 시 가슴과 허리 폄 근육의 근활성도 비교

  • Koh, Eun-Kyung (Department of Physical Therapy, Masan University) ;
  • Jung, Do-Young (Department of Physical Therapy, College of Tourism & Health, Joongbu University)
  • 고은경 (마산대학교 물리치료과) ;
  • 정도영 (중부대학교 관광보건대학 물리치료학과)
  • Received : 2012.07.31
  • Accepted : 2012.09.20
  • Published : 2012.09.30


The purpose of this study was to compare the muscle activities of the thoracic extensor(TE) and lumbar extensor(LE) during trunk lift (TL) exercise according to exercise position. Seventeen healthy subjects with no medial history of back pain were recruited for this study. Subjects performed the TL exercise in prone, quadruped and heel-sitting positions. The activities of the TE and LE were measured using surface electromyography during TL exercise in each exercise position. A one-way repeated-measures analysis of variance (ANOVA) was used to compare the normalized muscle activities of the TE and LE and the TE/LE ratio. The results showed that there was not significant effect of exercise position on the muscle activities of TE(p>.05). However, there was significant effect of exercise position on the muscle activities of LE and the TE/LE ratio(p>.05). Post hoc pair-wise comparisons with Bonferroni correction showed that both muscle activities of LE and TE/LE ratio in prone position were significantly different in those in heel-sitting and quadruped positions, during TL exercise, respectively. The TE/LE ratio was the greatest for TL exercise in heel-sitting position. Therefore, for selective activation of the TE muscle, we recommend performing the TL exercise in heel-sitting or quadruped position.


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