The Potential Risk Factors Relevant to Lateral Epicondylitis by Wrist Coupling PostureReportar como inadecuado




The Potential Risk Factors Relevant to Lateral Epicondylitis by Wrist Coupling Posture - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

The use of awkward wrist postures and unskilled techniques might induce lateral epicondylitis. This study thus investigated the effects of wrist deviation combined with extension and movement velocity on the dynamic performances of the wrist muscles during the coupling posture via a custom-made bi-planar isokinetic dynamometer. Thirty subjects were recruited to perform the isokinetic testing. We measured the muscle strengths and activities for the wrist extensors and flexors during concentric and eccentric contractions at three movement velocities, 30°s-1, 90°s-1, and 180°s-1, combined with three wrist postures, neutral position NP, radial deviation RD, and ulnar deviation UD. The root mean square RMS of the electromyographic signal in the extensor digitorum communis EDC, normalized peak torque of extensors, and ratio of normalized peak torque between wrist extensors and flexors, were all greater in the NP than RD and UD in both contractions. The ratio of RMS between EDC and flexor digitorum superficialis FDS had a significantly greater value in RD than UD during the concentric contraction. The EDC showed significantly higher activity at the fast velocity in both contractions. Nevertheless, a significantly higher RMS of the electromyographic signal between EDC and FDS and the ratio of strength between wrist extensors and flexors were found at slow velocity in both contractions. The wrist deviation combined with extension and movement velocity of the wrist joint should thus be considered as influential factors which might alter the dynamic performances, and may result in further injury of the elbow joint.



Autor: Su-Ya Lee, Hsiao-Feng Chieh, Chien-Ju Lin, I-Ming Jou, Li-Chieh Kuo , Fong-Chin Su

Fuente: http://plos.srce.hr/



DESCARGAR PDF




Documentos relacionados