Electromyographic analysis of trunk and lower extremity muscle activities
during pulley-based shoulder exercises performed on stable and unstable
surfaces |
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Authors: | Doochul Shin Jaeyun Cha Changho Song |
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Institution: | 1) Department of Physical Therapy, Sahmyook University, Republic of Korea |
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Abstract: | Purpose] The aim of the present study was to identify the effects of an unstable support
surface (USS) on the activities of trunk and lower extremity muscles during pulley-based
shoulder exercise (PBSE). Subjects] Twenty healthy college students were included in this
study. Methods] Surface EMG was carried out in twenty healthy adult men. The activities
of trunk and lower extremity muscles performed during PBSE using a resistance of 14 kg on
a stable or unstable support surface were compared. The PBSE included shoulder abduction,
adduction, flexion, extension, internal rotation, and external rotation. Results] On the
unstable surface, the rectus abdominis and erector spinae showed significantly less
activation during shoulder external rotation, but the extent of activation was not
significantly different during other shoulder exercises. The external oblique and rectus
femoris showed no significant difference during any shoulder exercises. The tibialis
anterior showed significantly greater activation during all shoulder exercises, except
flexion and extension. The gastrocnemius showed significantly greater activation during
shoulder abduction, extension, and internal rotation. However, during shoulder adduction,
flexion, and external rotation, the gastrocnemius showed no significant difference.
Conclusion] The use of USS to increase core stability during PBSE is probably not
effective owing to compensatory strategies of the ankle.Key words: Electromyography, Core stability, Ankle strategy |
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