Effect of foot placement on EMG of trunk muscles during asymmetrical squat lifting in healthy Thai males aged 18-23 years
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Background: Torso twisting during lifting represents an asymmetrical posture that can result in bodily injuries. Foot positioning while lifting is one of the factors used in posture design to reduce the risk of injuries. However, the impact of foot positioning on the trunk muscle activity in asymmetrical lifting is still uncertain.
Objective: To investigate the effect of foot placement on the electromyographic activity of trunk muscles during asymmetrical squat lifting.
Method: Thirty-one males participated in the study. All participants were asked to lift a 7-kilogram box measuring 36x26x28 centimeters from the floor to a stand at hip level on the right side. Two types of foot placement were investigated: equal foot position (EP) and left forward stride position (LP). Eight electromyography (EMG) of both sides of lumbar erector spinae (ES), multifidus (MF), internal abdominal oblique (IO), and external abdominal oblique (EO) were performed. The percent of MVC of average amplitude EMG of the lifting and twisting phases of the lifting task was analyzed.
Results: The results showed higher activity of IO, ES, and MF during the twisting phase (p<0.05), and the right ES worked harder than the left during the twisting phase in both foot positions (p<0.05). However, activity of the right IO was greater than left IO during the twisting phase in EP.
Conclusion: The foot position did not affect the EMG of the investigated trunk muscles during asymmetrical lifting. However, IO, ES, and MF showed higher activity in both foot positions during the trunk twist.
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