The Electromyographic Changes of Abdominal Muscles in Two Sit-up Movement for One Minute

ABSTRACT Muscles have an important role in daily physical works and with increasing knowledge of them we could have appropriate physical position and achieving success in sports. The purpose of this research is to study of electromyographic changes of two abdominal muscle (Rectus abdominus and external oblique) in two kinds of sit- up in one minute. The subjects were 15 healthy students and non-athletic; that were chosen unrandomly from 400 students of high school. The 4- chanell physiograph (MKIII) recorded the MUP in one minute for rectus abdominus was m. 14. 23 ± 2.24 and for External oblique m. 13.26±2.74 in suggested method but the MUP of the same muscle in common sit-up method was 13.71± 3.36 and 13.23±2.38 respectively. The amplitude of spike in one minute for Rectus abdiminus m. was 171.12± 33.72 µ v and for external oblique m. was 148.3±24 µ v in suggested method but the amplitude of spike of the same muscle sit- up was 136.73± 27.47 µ v and 153.8± 23. 46 µ v repectively.