Analise das alterações nos padrões de preensão palmar em pianistas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This work describes an experimental study that aimed to quantitatively analyze the palmer gripping patterns of pianists during the execution of function tasks relating to gripping and speed of execution. Twenty-five subjects (11 pianists and 14 non-pianists) carried out 4 tasks with their right hand: Gross gripping at fast speed (T1); Gross gripping at low speed (T2); Hook gripping at fast speed (T3); Hook gripping at low speed (T4). Sixteen markers were put on the dorsal surface of the hand, on the proximal and distal extremities of the metacarpian bones and proximal phalanges of the 2nd and 5th fingers. Four digital video cameras connected to two microcomputers were used to capture the images. The measurement of the coordinates and the three-dimensional reconstruction of the markers were carried out through the ?Dvideow ?Digital Video for Biomechanics? system, developed at the Instrumentation Laboratory for Biomechanics at the Physical Training College at UNICAMP. The flexion and extension angles of the metacarpophalangeal articulations were calculated from the measurement of the marker coordinates. The phase diagram movement cycles were used to analyze the alteration in the palmer gripping patterns in pianists. The Principal Components Analysis was used to quantify the movement patterns and the regularity of the the phase diagram movement cycles which were built from the position and angular speed curves; the correlation between the angle curves of finger joints was used to evaluate the finger synergy during the task. With these results as a starting point, it was possible to observe that the most evident differences between the control and pianist groups were identified in the regularity of the curve for the second task (T2) through the Principal Components Analysis, and for all the tasks, in the analysis of the correlation between the angles of the metacarpophalangeal joints. In the comparison between the tasks, a difference was observed among those carried out in gross and hook gripping in all the analysis.Through the methodology employed and the form of analysis, it was possible to estimate the alterations in the palmer gripping patterns of pianists and compare pianists with non-pianists

ASSUNTO(S)

mãos pianistas kinematics pianists hand cinematica

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