Wojciech Kiebzak, Michał Dwornik, Justyna Żurawska, Arkadiusz Żurawski

W. Kiebzak, M. Dwornik, J. Żurawska, A. Żurawski – sEMG assessment of the activity of the rectus abdominis and multifidus muscles in different sitting postures. FP 2017; 17(3); 52-62

Abstract

Aim. To assess the activity of the rectus abdominis (RA) and multifidus (MF) muscles during slump and active sitting.
Material and method. The study involved 30 participants aged 19-23 years. The activity of the rectus abdominis (RA) and multifidus (MF) muscles was assessed by surface electromyography in four different sitting postures. A questionnaire was also used to assess the degree of difficulty associated with maintaining a particular position. The results were subjected to a statistical analysis.
Results. The highest RA tone of 2.34 was recorded in the adjusted position with backward tilting of the trunk, and the lowest of 1.16 in the slump position. The MF muscle was most active (33.01) in the adjusted position with forward tilting of the trunk, and least active (18.66) in the slump position. The highest proportion of the participants considered the adjusted position with forward tilting of the trunk to be the easiest, followed by the slump position (86.67% and 83.33%, respectively). The adjusted position with backward tilting of the trunk turned out to be the most difficult to maintain (for 90% of the participants). T1 scores indicate a normal distribution of the empirical data.
Conclusions
1. The adjusted sitting position with forward tilting of the trunk is compatible with the clinical assumptions of correct body posture.
2. The adjusted sitting position with forward tilting of the trunk should become an element of national programmes of back overload prevention.

Key words:
sitting posture, sEMG, RA & MF activity, T1 scores

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