PMID: 9416361Jan 1, 1997Paper

The influence of forearm, hand and thumb positions on extensor carpi ulnaris and abductor pollicis longus activity

Acta Anatomica
E van OudenaardeR A Oostendorp

Abstract

The objective of this study was to investigate the influence of forearm, hand and thumb positions on electromyography (EMG) activity of the abductor pollicis longus (APL) and the extensor carpi ulnaris (ECU) muscles. A second objective was to study the role of these muscles in stabilizing the wrist during movements of the thumb. This knowledge is important in clinical assessment and reconstructive surgery. At a constant force of 5 N for the thumb and 20 N for the hand, EMG activity was recorded with intramuscular wire electrodes in isometric and dynamic contractions in different positions and movements in the thumb and the hand. EMG activity of the right hand of 7 subjects was scaled relative to the mean EMG value at maximum voluntary isometric contraction to compare relative muscle activity in the tests. The results show that the position of the forearm does influence activity of the APL, but not of the ECU. The deep part of the APL shows differences in EMG activity between the positions of the forearm in dorsal flexion of the hand and the superficial part of the APL in palmar flexion of the hand. The ECU and the deep part of the APL are very active during movements and isometric contractions of the thumb. It is suggested that...Continue Reading

Citations

Feb 14, 2006·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Katia FournierDenis Gravel
Mar 6, 2007·The Journal of Hand Surgery·Matthew ColmanLouis F Draganich
Apr 12, 2008·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Zong-Ming LiRodrigo Kaz
Sep 18, 2009·Clinical Orthopaedics and Related Research·Elena BravoAdrian Bullón
Jul 1, 2011·Journal of Neurophysiology·Curtis D Manning, Parveen Bawa

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