Introduction. There are insufficient research studies, analysing the advantage of physiotherapy using Dr. Wolff trainers against the core stability exercises, applied in the cases of lower back pain. 
Purpose. To compare the effects of two different core stability exercises programs on the functional status and quality of life of working-age persons in the cases of lower back pain.
Methods. The research was conducted at Rehabilitation, Physical and Sports Medicine Centre, Vilnius University Hospital Santaros Clinics. 53 patients suffering from lower back pain participated in the study. The average age of participants was 34 ± 9.6 years. Participants were randomly divided into two groups: investigative - core stability exercises with Dr. Wolff trainers (n=25) and control - traditional core stability exercises (n=28). 
The isometric trunk muscle strength has been measured using a diagnostic equipment Back-Check created by Dr. Wolff, trunk mobility – using an inclinometer and Schober’s test, pain – using a Numeric Pain Rating Scale (NPRS). The functional status has been assessed using Oswestry and Roland – Morris questionnaires. 
Results. The assessment of the results between the groups showed statistically significant improvement of trunk mobility by leaning forwards in the investigative group. Moreover, Schober’s test results showed a statistically significant higher increase in the investigative group in comparison with the control group.
Conclusions: Traditional core stability exercises and exercises with Dr. Wolff trainers have equal effect on human functional status (p>0.05). Core stability exercises with Dr. Wolff trainers is more suitable for exercising trunk mobility by leaning forwards rather than traditional core stability exercises (p<0.05).

THE EFFECT OF CORE STABILITY EXERCISES ON FUNCTIONAL STATUS IN PATIENTS WITH LOW BACK PAIN