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http://dx.doi.org/10.5762/KAIS.2012.13.3.1229

The Effects of Hand Grip Force on Shoulder Muscle Activity in Two Arm Posture  

Jang, Hyun-Jeong (Dept. of Physical Therapy, College of Natural Science, The Graduate School, Daejeon University)
Kim, Ji-Seon (Dept. of Physical Therapy, Yuseong Hangajok Rehabilitation Hospital)
Choi, Jong-Duk (Dept. of Physical Therapy, College of Natural Science, Daejeon University)
Kim, Suhn-Yeop (Dept. of Physical Therapy, College of Natural Science, Daejeon University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.3, 2012 , pp. 1229-1237 More about this Journal
Abstract
This study aimed to investigate the effect of hand grip force on the activity of shoulder muscles in 2 arm postures. The muscle activity of the upper trapezius, lower trapezius, infraspinatus, anterior deltoid, and posterior deltoid muscles in 22 healthy subjects (11 men and 11 women) were measured using surface electrodes during 4 hand gripping tasks (0%, 30%, 50%, and 70% of maximum voluntary contraction) in 2 shoulder positions (neutral position and $90^{\circ}$ elevation position). Among changing grip force significantly differenced infraspinatus, anterior deltoid, and posterior deltoid muscles' activity in the shoulder neutral position(p<0.05). In the shoulder $90^{\circ}$ elevation position, anterior deltoid, posterior deltoid muscles' activity was significantly differenced(p<0.05). Hand gripping was found to alter muscle activation. The hand grip task activated the infraspinatus muscle in the neutral position and inhibited the deltoid muscle in the $90^{\circ}$ elevation position. This finding may prove useful for the development preventative measures and rehabilitation strategies for shoulder injuries.
Keywords
Grip force; Shoulder muscle; Electromyography;
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