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PURPOSE The purpose of study was to investigate the effect of muscle activation of Erector spinae, Gluteus Maximus and Biceps femoris muscle during modified bridge exercise in patients with chronic low back pain. METHODS The electromyogram was used to measure activation of Erector spinae, Gluteus Maximus and Biceps femoris muscle during five modified bridge exercise with electromyography electrodes in 21 patients (9 men, 12 women) who have suffered chronic low back pain. RESULTS The muscle activation of the erector spine to compare with NB, the posture of DB, TB, ABDB is statistically significant (p<0.05). In comparison with NB, the posture of TB and ABDB is statistically significant (p<0.05) for the gluteus maximus muscle activation. For biceps femoris muscle, all posture is statistically significant as compare with NB. In comparison with TB, the muscle activation of the erector spine is statistically significant in NB, and the gluteus maximus muscle activation is statistically significant (p<0.05) in NB, TMRB, DB. CONCLUSIONS These suggest that the 5 modified exercise for patients with chronic low back pain can induce compensation inhibition and selective muscle activation. It can be useful for providing a theoretical basis of back exercise program.

Effect of Modified Bridge Exercise on Muscle Activity of Erector Spinae, Gluteus Maximus and Biceps Femoris Muscle in Patients with Chronic Low Back Pain