![]() The control group consisted of 31 people without back problems (16 men and 15 women, mean age 39 +/- 6 years). Sixty-two patients with CHLBP were examined (30 men and 32 women, mean age 41 +/- 8 years). A reference electrode was positioned on the skin overlying the right arm. Electrodes were positioned unilaterally on the right side. Plain, surface electrodes were attached to the skin overlying the erector spinae at the T7 and L4 vertebrae, approximately 3-4 cm from the midline of the back. A summary of complete examination is presented in the form of statistical values of parameters such as mean amplitude, mean density, background amplitude, background density, and upper amplitude and upper density. ![]() This programme allows the registration, transformation, analysis and projection of results on-line. EMG apparatus was connected to a PC equipped with the EMG-LAB programme. The aim of the study was to evaluate the usefulness of surface electromyography (EMG) as an identification method in CHLBP. Dysfunction of the erector trunci is a fundamental cause of CHLBP. ![]() ![]() Frequency of CHLBP occurrence oscillates between 60 and 80%. Chronic low back pain (CHLBP) occupies first place among factors restricting people's life activity under the age of 45.
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