Abstract
We analyzed changes in electromyographic (EMG) activity in the lumbar paraspinal muscles according to Inverted-Spinal-Traction (IST) protocols, and based on the results, identified how the various protocols affected the relaxation of lumbar paraspinal muscles. Sixty healthy adult males participated in this study. They were randomly divided into three groups according to different traction protocols: 30°---30°, 30°---60°, and 60°---60°. IST was performed for 6 min in two phases, with each phase lasting 3 min. The root mean square (RMS) of EMG signals from the left and right lumbar paraspinal muscles was measured during IST, and changes in EMG activity were analyzed by examining the differences between the phases. The greatest difference in the RMS of EMG signals from the left and right lumbar paraspinal muscles during IST occurred between the phases in the 30°---60° group. The RMS of EMG signals from the right L2 and left L4 paraspinal muscles exhibited statistically significant differences between the phases. Although the RMS of EMG signals from the left L2 and right L4 paraspinal muscles did not show statistically significant differences between phases, they did exhibit similar patterns. In this study, the progressive 30°---60° IST protocol was the most effective for relaxing lumbar paraspinal muscles.
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