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http://dx.doi.org/10.12674/ptk.2012.19.3.011

The Effects of Isometric Lower Limb Contraction on the Activation of Contralateral Trunk Muscles in Healthy Young Adults in Supine Position  

Park, Hyun-Ju (Dept. of Physical Therapy, The Graduate School, Deajeon University)
Sim, Sun-Mi (Dept. of Physical Therapy, Youseong Wellness Hospital)
Choi, Jong-Duk (Dept. of Physical Therapy, College of Natural Science, Daejeon University)
Oh, Duck-Won (Dept. of Physical Therapy, College of Health and Medicine, Cheongju University)
Publication Information
Physical Therapy Korea / v.19, no.3, 2012 , pp. 11-19 More about this Journal
Abstract
This study aimed to investigate whether isometric lower limb exercise can activate contralateral trunk muscles and whether the magnitude of muscle activation is related to lower limb movement in sitting. This study included 25 healthy young subjects (20 males and 5 females). The magnitude of trunk muscle activation was measured using surface electromyography (EMG) during hip flexion, extension, adduction, and abduction, and a significant difference was observed in the activation levels of trunk muscles among the tests (p<.01). The EMG activity of the multifidus (MF) and erector spinae (ES) muscles on the contralateral side were significantly greater during hip extension. However, the activation levels of the contralateral internal oblique (IO) and rectus abdominis (RA) muscles were greatest during hip flexion. The MF : ES EMG ratio was significantly greater during hip isometric during hip isometric flexion and abduction compared to hip extension and adduction. There was no significantly difference in the IO : RA ratio during the isometric contractions toward different directions. These findings indicate that isometric lower limb exercise can elicit trunk muscle contraction on the contralateral side and may therefore be helped for developing contralateral trunk muscle strength in individuals undergoing rehabilitation.
Keywords
Contralateral trunk muscle; Electromyography activity; Lower limb;
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