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KMID : 1194820140100010033
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Journal of Korean Society of Sports Physical Therapy
2014 Volume.10 No. 1 p.33 ~ p.38
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Differences on Maximal Muscle Activation of Fingers with and Without Cutaneous Sense
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Kim Jung-Jin
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Abstract
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This research demonstrated the effect on the MVF (Maximal Voluntary Force) and MVIC (Maximal Voluntary Isometric Contraction) of forearm when cutaneous sense is removed. We measured maximum pressing force of each four finger (index, middle, ring and little) with electromyography of flexor digitorum superficialis, pronator teres and extensor carpi radialis (ECR) before and after local anesthesia in each four finger tips. As a result of removing the cutaneous sense input, the outcomes showed that the MVF were decreased and MVIC was phenomenally decreased in ECR. We considered that the decrease of ECR activation seems the main reason of decreased MVF. Therefore, the cutaneous sense should play an important role to induce the MVF. Also, since the ECR would function as the synergist in this experience, transmitting signal through cutaneous sense might relate with changes of synergist activation.
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KEYWORD
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anesthesia, cutaneous sensory input, maximum force, muscle synergies
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