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http://dx.doi.org/10.5143/JESK.2006.25.2.147

Effects of Intentional Abdominal Muscle Contraction on Lumbar Muscle Activities andLumbar Extension During Lifting Above the Shoulders  

Kim, Hui-Won (연세대학교)
Gwon, O-Yun (연세대학교)
Lee, Chung-Hwi (연세대학교)
Jeon, Hye-Seon (연세대학교)
Publication Information
Journal of the Ergonomics Society of Korea / v.25, no.2, 2006 , pp. 147-154 More about this Journal
Abstract
This study was conducted to evaluate the effect intentional contraction of abdominal muscles during lifting above shoulder on the muscles activities of the lower trunk and on the degree of lumbar extension. Fifteen healthy adult males were selected as test subjects. A 5kg weight was raised to the shoulder level, 20cm, and 40cm above the shoulder level. EMG activities of all muscles except the rectus abdominis were significantly greater when subjects were asked to contract their abdominal muscles intentionally during lifting(p<0.05). Degree of lumbar extension also significantly decreased with intentional abdominal contraction during the lifting. Also, degree of lumbar extension significantly increased with increase in lifting height(p<0.05). The results of this study show that intentional contraction of abdominal muscles during lifting above shoulder increases the EMG activities of external abdominis oblique, internal abdominis oblique, and erector spinae.
Keywords
Angle of lumbar extension; Contraction of abdominal muscles; Lifting task;
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