Features of the functioning of global stabilizer muscles in persons with pelvic and sacral frontal plane asymmetry. Report 1. Study of m.erector spinae activity

V.A. Staude, I.V. Kotulskyi, D.R. Duplii, O.D. Karpynska


Background. The purpose was to investigate electromyo-graphy (EMG) activity of muscles, which stabilized sacroiliac joint and support trunk vertical stability during two- and one-leg standing with and without load with different angles of pelvic and sacral base tilt in frontal plane. Materials and methods. Thirty six healthy volunteers were examined. The group consisted of 25 males and 11 females. Average height of patients was 173 cm (from 168 to 183 cm), average body mass index — 2.99 (from 3.34 to 2.62). We have studied EMG activity of muscles, which stabilized sacroiliac joint during two-leg standing, one-leg standing (Stork test), one-leg standing with 5 kg load in contralateral hand. Volunteers were standing in needed position for 10–15 s. During this test, EMG activity in m.erector spinae was recorded. Maximal, average, summary amplitude and average frequency of EMG were analyzed. All volunteers were examined using X-ray. On X-ray, sacral base tilt and pelvic tilt in frontal plane were measured. Results. The sacral base and pelvic tilt cause asymmetry of m.erector spinae acti-vity, which increases with increasing sacral base and pelvic tilt. During one-leg standing without sacral base and pelvic tilt, there was an increase in m.erector spinae activity on support side. When sacral base and pelvic tilt is increasing in support leg side, there was recorded an increase of m.erector spinae activity on the lifting leg side. During the test with loading, we have detected an increasing difference between left and right side m.erector spinae activity. At one-leg standing on contralateral side of tilt, m.erector spinae activity increased on support side.


sacral base tilt; pelvic tilt; electromyography; one-leg standing position; two-leg standing position


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