Background: Low back pain is one of the most common health problems. Fatigability of back muscle studied during isometric fatigue test but not studied in static position like standing that is one of the positions that associated with low back pain.
Objectives: This study aimed to assess erector spinae (thoracic and lumbar part) and external oblique muscles fatigability and motor control strategies before and after standing task.
Material and Methods: Forty two female volunteered subjects, were selected. Chronic mechanical low back pain group includes 22 subjects and control group include 20 healthy subjects. Subjects in both groups were asked to stand for 30 min, median frequency of electromyography (EMG) of right and left (thoracic and lumbar erector spinae, and external oblique muscles) were analyzed at the first and last 5 minutes of the 30 minutes standing task.
Results: There was a significant interaction between groups and time in both paraspinal and external oblique muscles (p ˂ 0.05). In addition there was a significant interaction between time, groups, sides and muscles concerning erector spinae muscle (f=5.997 and p 0. 003).
Conclusion: Standing task induced muscle fatigue in both MCLBP and control with altered motor control strategies.
Key words: Key word: Low back pain, fatigue, motor control, back extensors, standing task.
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